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An indepth 8 way comparison? My word, if you keep working this hard on youtube videos you aren't going to get any imaging done :) You mad hatter, although I am interested to see the affinity segment, I've never even really looked into it before.

I'm going to give your grid layout a 5/5: the way you gave annotations about each score and then the total possible points listed at the bottom of each column made it really easy to follow 😂

Hi, thanks for showing Affinity Photo in this showdown! Just a clarification, all data is stacked in linear 32-bit unbounded, and stays this way once you apply the stack and move back to the main Photo persona (workspace). This seems to confuse quite a few people because of the way Photo handles working in 32-bit linear: the actual pixel values remain linear, but a non-destructive gamma view transform is added to the document view so you're seeing gamma corrected pixel values. It does this to avoid the Flatten>Convert and tone map step that is often required in other software (e.g. Photoshop). You can do your entire edit in 32-bit, then simply go to File>Export, knowing that if you export to a gamma-encoded format such as 8-bit JPEG it will look exactly the same. You can bypass the view transform by going to View>Studio>32-bit Preview and switching from ICC Display Transform to Unmanaged: this shows you the scene-referred linear values. This is only useful for an analysis purpose, however, and you should use ICC Display Transform for actual editing so you don't end up surprised when exporting to an interchange format. A way to confirm this behaviour is to use the colour picker tool: it will be picking linear values, so a background value will likely be 0.01 for example. The other behaviour to be aware of is that Photo adds non-destructive Levels and Curves adjustments to the layer stack, for a gamma transform and tone shaping respectively, which presents the user with a more meaningful starting point. You can of course hide or delete these if you wish to tone stretch completely from scratch. PS for multi-night stacking you would simply use file groups. These allow you to split your data up, as you may likely have separate calibration frames for each night. Hope the above helps!

Correction for APP, if you set everything in those tabs, you can hit "integrate" in the last tab and it'll run everything you selected.

Thanks Nico. I am just graduating to DSO photography so getting such a comprehensive comparison of Stacking software is greatly appreciated. I was aware of most of the software you covered but ASTAP was new to me and I will investigate further. I am presently working to understand SIRIL for now though and getting a bit of your insight into how it actually works was also very helpful.

Like others have said, really grateful you did a great job of laying out a grid that allowed us to understand the comparisons, and as a Mac user I appreciated knowing what resources were available without having to give them all a try. Keep up the good work.

One final comment about Sequator, which I use for deep sky as well as for nightscapes, is that it can register stars correctly even in the presence of significant geometric distortion from a lens. This is not something that affects images from telescopes but can certainly affect images from wide-angle lens and even some telephoto lenses when aggressive dithering is used or when shooting untracked images (say, for nightscapes), both of which cause significant changes in where specific stars appear from frame to frame. That is something you did not test. Some of the other programs may also handle that well but some like DSS are known to be poor in that regard.

Oh good. I always wanted an answer to this as I have to take thousands of exposures sometimes and it's really time consuming to try multiple programs to see if one gives better results in that particular case. Looking forward to this!

Great breakdown. From this, I think the way to decide which one to choose is to look at the final result score (since that's the most important thing), and then work your way backwards. For example if PixInsight is too expensive then you look at ASTAP, but if the processing time is too long for you then you go with DSS or Siril, etc.

Tremendous work Nico! the amount of effort it undoubtedly took to put this together is nuts, maximum respect man! 🙏 I had serious initial confusion when I switched over to APP for my stacking needs, for a long time I didn't realise that I could load my frames and skip straight to the 'integrate' part, it was only after this was pointed out by a friend that I knew haha! No doubt a major failing of the programs UI that this info isn't made clear to a new user right away as its such a huge usability boost! Thank you for taking the time to make such an honest run through of all these options mate, again - wonderful work! :-) Clear skies!

In regards to your notes on AstroPixelProcessor, noting that you cant do everything and then click one button to start everything... yeah you can. You just configure everything, then hit Integrate in the last tab, and it does everything in order.

Affinity-> 2:45 App -> 8:04 Astap -> 12:00 Dss -> 15:57 Pix -> 20:08 Registar -> 27:00 Sequator -> 30:40 Siril -> 34:01

Thank you so so much for doing this so we don’t have to! You’re a Life & Time saver for many.

A big plus for Siril is you can open multiple windows and work on different projects at the same time. I once had 7 versions of Siril open and stacked different projects. On a ssd it is 5x faster than on a hdd.

Great comparison that was fun to follow. A couple of years ago I started with DSS which is very easy to learn. Now I use PI which has a very steep learning curve but is so powerful. A couple of issues to consider. First high cost of PI needs to put in context that it's a complet and incredible powerful imaging processing program. Second, for all of these programs, the range and quality of online tutorials, free and not, also has an impact on how easy it is to learn to use the programs, especially when you get beyond the basics.

this is one of my favorite Astrophotography channels. thanks for creating and sharing these videos

Thanks for all the hard work! I was die-hard DSS user even after I went to PI because it was easy and what I learned first. Once I got WBPP going...especially the later updates, I never looked back. PI can sort diff exposures and gain so easily...plus assign flats and dark-flats effortlessly it's a no-brainer to use it all the time now!

Without watching: my prediction is that DSS will result in the best score for beginners and PixInsight and (maybe SiriL too) will score the best for people who know the entire process and want full control. Edit: after watching the full video, glad to see my preconceived notions were correct! I am also surprised by astap. Not because it’s so good, but because I’ve never tried using it for stacking (I use astap as a plate solver too). I guess I will need to try it out! Pixinsight is still the best though because if you set up remote connections you can have a different computer preprocessing your data in real time as it comes in. Super important for big telescopes like the one we have at our observatory! Great video, Nico! Thank you!

Definitely going to try ASTAP. Thanks for testing these Nico💪

Great Video Nico! very informative, thank you for taking the time, it was so helpful!

Nico, great video. Regarding Affinity and the final result not being linear... By default Affinity applies a curve and levels adjustment to the image (as layers) and you can delete those to return the image to the linear state before exporting out to something like PI. Also, in APP you mention that you have to work through each "step" one at a time and click the button at the end of each tab to process that step before moving on to the next. This is also not necessary. You can simply set each of the options as you desire and then click the button under the final (integration) tab and it will run through any "unprocessed" tabs in order to get to the final result. I think part of why this is confusing is (as you said) the interface looks like a relic at this point.

Another epic and thorough comparison video. Great work Nico! This is going to be super helpful for many people.

Awesome review. Thank you very much for your dedication to helping use beginners.

Great work! I use ASTAP for its pre-processing algorithm and, of course, for plate-solving, as it is the best choice for Linux-based imaging/pointing software, but I never used it for actual stacking. I'll have to give it another look. I had using Siril for stacking, but am moving to PixInsight if I can get used to the speed penalty. Two things regarding Siril: 1. In Linux (and possibly Mac) it can now use file linking (a UNIX form of aliasing a file rather than copying the whole file) which drastically saves disk space and increases speed significantly. 2. Siril works fairly well without the scripts. You just start at the left side of the program options and do each one (as applicable) from left to right, beginning with Conversion and ending with Stacking. Thank you for including Linux as a component of your evaluations!

In some sense APP has the most consistent UI of all (It may look or feel not so beautiful to you though). The left hand tab is for processing. The middle is for visualisation. And the right hand is for creating the final look of the image from the linear one. None of the options on the right hand side affects the FITS files, just the visualizaton, unless you export to a TIFF with the button in the right hand panel. You may call it "stretching" but there is more to it, like saturation or sharpening. This way you can overstretch your image during processing just to see the faults better, then take back for the final result. Or for color calibration you can stature, then calibrate (because that works on the linear image, not the stretched and saturated one). If you don't like the result you can go back. Not even Siril have that feature.

One of the most helpful astrophotography vids I’ve seen!

It's just what I was looking for... I'm sure you read our thoughts... Thank you very much and greetings from Spain

In astro pixel processor you can set everything up and click only the integrate button on tab 6. That will do all the previous steps as well. Anyway, Awesome video as always!

In APP you don’t really need to click through all of the steps one by one and create all the intermediary files. Just load your source files, set up the params you want and hit Integrate on tab 6). It will do it all and spit out one (or one per filter) integrated final image

ASTAP is also a completely offline plate solver that can do a blind search in a couple of minutes or a directed search in seconds. That's what the main page of the program is about. Love it for that, just drop in a snapshot and click solve (to direct it you can either enter RA/Dec in the top left or double click and enter an object to find in the catalogue).

Hi, Nico. Thanks so much for this excellent evaluation. I've been trying a couple of options and you have certainly helped me consolidate my own choice. One thought, which may (or may not) help folks decide what is best for them, is to 'weight' each of the criterion according to how important it is to them. For example, one person may consider Cost more important than Features, and someone else, Features more important than Cost. The table you presented, essentially has each of the criteria weighted equally. Here's an example - the weighted totals are simple each score multiplied by the value in its Importance column and then all added together. I’ve chosen to used weights in the range 1-5, but you could use 1-10 equally well. In this example, Final Result is weighted the most important (5), Features second (4), Cost and UI/UX in the middle (3 each) and Speed(2) and OS(1) least important). With these, weightings, PixInsight becomes an even more distinct choice, but with different weightings, others may emerge as more favourable to the individual making the choice. Apologies if the table is a little hard to read - it's best done in Excel of course, but I couldn't work out how to copy that in here. Cost OS UI/UX Features Speed Result Total Weighted-Total Importance (1-5) 3 1 3 4 2 5 Affinity Photo 2 2 5 2 2 6 19 65 Astro Pixel Processor 1 3 3 5 0 7 19 70 ASTAP 3 3 3 3 1 9 22 80 Deep Sky Stacker 3 1 5 3 2 7 21 76 PixInsight 0 3 4 5 1 10 23 87 Registar 2 1 1 2 2 3 11 37 Sequator 3 1 4 2 4 2 16 48 Siril 3 3 2 2 4 7 21 69 Thanks again for your excellent work, Nico! Cheers. Paul

Great video! I think siril ui needs a little more love, specially for the great descriptions you get when overing a setting with the mouse and the tutorials on their webpage are pretty good too.

I don't do astrophotography but I found your video fascinating and extremely WELL DONE!

I've only used Sequator on the handful of astro images I've tried. I thought my camera was crap, or maybe that I was doing something horribly wrong. I hadn't even thought to blame the stacking program. Seeing Affinity really surprised me.

Excellent video Nico - one of your best. I wish I had enough time to do this comparison myself but I don't have time and won't until I retire - fortunately you are here to do it. I have only stacked used PI and DSS. I never heard of Siril, Affinity, and I thought ASTAP was only a plate solver - what a surprise. I was thinking about trying out APP recently not because I don't like PI but rather I heard it does mosaics pretty well but I figured out how to do it with PI. I am happy with PI and pretty much use the default settings because I get overwhelmed with all of the stuff you can change. That said, thanks for going over some of the WBPP stacking features as I never would have figured out what they do. Cheers Kurt

Affinity Photo looks really good to me. a bit ritcher nebula colors and less noise with no banding. - just what i see on youtube. 4k and btw. what a great work with this one! really appreciate your work. for us newbies it's such a value! thanks!

Hello Nick! Nice vlog, thanks :) just a small correction: sirilic is available also on Linux, and not only on Windows!

Nico, I really appreciate your time, consideration and unbiased approach to knowledge sharing. Thank you so much for teaching us and sharing your experience. It is because of you and this amazing community that gave me the confidence to enter this hobby. Stay awesome.

Thanks for the tabular information. It has served me well in my hobby of astronomy. Thanks again. Best regards.

Thanks Nico, I have always wanted a comparison like this.

Impressive work to make this video. Thanks.

I sometimes use DSS for registration/calibration and stack the images with image integration with the winsorised sigma clipping etc using the image integration in Pixinsight. This greatly speeds up things and yields nearly the same quality as doing everything in Pixinsight, especially concerning noise

I use a few of the programs you mention. Affinity is my primary photo-editing program and works very well. Astrophotography stacking is pretty good, but not the best. However I am sure it will get even better. Its user interface is excellent.

Have learnt a lot from Nico. Very excited for this video. This will help me make an informed decision before buying some of those expensive and non refundable licenses.

Great comparison. Didn't know about ASTAP either. I will definitely have to check it out. I do use Affinity Photo, and noise is an issue with my pics. Still very new to the hobby, so it may be due to my data collection, etc. Thank you for the showdown.

This is perfect! It's what I needed to see to help me with my decision!

Very thorough. Thanks

With APP, just go direct to Integrate and hit integrate. It runs through all the processes without needing user intervention. Unless there is a problem with the data.

Nico, thank you for all your videos, and this one comparing pros and cons of different stacking software. I have learned much from you (and Borealis Lite) on how to use Siril. I also have Affinity. I was actually surprised that you gave Siril and Affinity similar ratings on features. I use both, but I mostly use Siril. While I agree with all your other rating comparisons of the two software, I feel that Siril is much better on the initial stage of post-processing. Siril has much better and more flexible background extraction than Affinity, and it also includes photometric calibration, banding software, and a median filter, among many other tools. I agree the later part of processing is not good in Siril. Sometimes, I will use Affinity to stack, but then use Siril for background extraction, etc.

Thanks for this video, I will def. take a look at ASTAP

Regarding Siril, you can do all tHe preprocessing via the UI , with a lot of additional options like stacking only the best xx% based on several metrics… I often used the manual proces to compare what additional improvements can be found to the scripts.

Agree that ASTAP is underrated! Also arguably the best platesolver and has a great free tool to use as an alternative to CCDInspector when checking for tilt/backfocus!

Well, I didn’t think I’d once see a review saying PixInsight’s UI is as easy as Sequator :)

I would add that in Siril , you can do the manual steps on the left side, loading in the files and darks and flats, scripts are nice and easy, but full manual stacking is also available right there. The problem is, it's not very intuitive and many people opening up Siril the first time might be lost what to do first.

Thanks a lot 🙏 I only tried Deep Sky Stacker some years ago and I think I will continue with that next time I will try some Astro photographing 🙏👌

Nice comparison video, Nico! I'm quite impressed that you've covered so many programs for the comparison I'm a heavy user of Siril for my DSO stacking, and I do my stacking all manually, not using the scripts. By doing it manually, you get a lot of tweaking options and features on pre-processing, registration and integration processes, and I suspect many of the other softwares introduced in this video has many tweaking options available too. I totally understand this video is intended for users in the beginner's side who would probably prefer a fast, one-click and intuitive stacking software, and your scores are probably justified. Though I'm quite curious about the stacked results comparison when all the stacking parameters are as closely adjusted as possible if not the same. I think what many of serious astrophotographers out there would like to know that and see if their software of choice is capable of delivering the best results.

Thank you for such an in-depth review

Thanks for the comprehensive video. I brought affinity same as you when it was on sale. I only use it for post processing. Scripts from James R, one of the Affinity dev are quite good. I prefer SIRIL for pre processing and stacking snd even some basic processing. It is by far the best (and blazing fast). But looks like need to get my hands on ASTAP, though using it for offline platesolver in NINA, stacking looks very promising . Thanks for giving the valuable info about the underdog.

Excellent comparison Nico! Can I suggest/ask for a similar video for the planetary stacking programs like PlanetarySystemStacker, AutoStakkert3, and AstroSurface. I know you don't primarily do planetary/moon/sun imaging but lots of folks that watch your channel do. Thanks again for all your efforts!

Great comparison Nico! Thank you for the effort. There is new stacker in ZWO ASIStudio from ZWO (astronomy imaging camera manufacturer) called ASIDeepStack. Fairly basic but works.

The video indirectly reminded me that I didn't check for a new version of DSS, so I did, and to my surprise there's now DSS 5.1.3 (as of June 2023), and it actually has a somewhat different interface (not fundamentally so), because it's been ported to Qt, meaning it can eventually be ported to other platforms!

As always, an amazingly done review, a joy to have access to such content freely. Thank you

Great video! didnt know about ASTAP and I am going to give it a try.

Thanks for the stacking sw comparison, I don't even know there are so many options there available

Thanks Nico. Great comparison.

Very interesting, thank you!

Great work Nico! I have used DSS, Sequator and Siril, Siril is my favorite of them. I am going to try ASTAP, it looks very interesting and it is free.

This is going to be real interesting, Nico. I recently got a Hyperstar for a C6, and the sheer volume of short frames is killing my wimpy processing laptop - and available hard drive space. I'm analyzing the impact on image quality by live stacking n number of frames with Sharpcap, and then stacking those calibrated stacks in APP. So far, results are encouraging. If this doesn't work well enough, then I'll be forced to throw money at the problem sooner rather than later. Or maybe one of those stacking programs I haven't heard about is faster than APP, and with good quality output.

You know what the best thing about being a subscriber? Watching you develop over the years as an astrophotographer, as a producer/director/creator here on youtube. Im proud of you buddy!

Re:AstroPixelProcessor, although I agree the UI/UX needs a lot of work, earlier steps are auto-run if you don't do it manually.

Thanks so much for doing this. Amazing job. I must say that although PixInsight is expensive compared to others, you get what you pay for. in my view, weighted batch processing would be worth it if it was a standalone program. If you are on the fence in the year 2022, get PixInsight . It is so much easier to use now than just a year ago. As for speed, naturally since it’s doing so much more, it’s going to be slower. What Astro photographer wouldn’t be willing to wait for a better result. We put in so much time gathering data. thanks again, Rick

Teally good help for those who haven’t decided whit which stacking program to start their way. I have tried the most of them and agree with your conclusion of scores. I would like see you to make a follower for this tutorial which looks how much helping tutorials there is on youtube for beginners, so even if pixInsight is costly there could be tons of free learning material to get started. Also I like to raise my hat for your so fantastic good way to make your tutorials pedacogical way, you are probably the only who have realised that those who watch learning tutorials are who needs it (beginners, newbies) and of course we ss your fans and students!

Very cool video- I use Astap all the time, but as a plate solver- It is fast as hell! I've heard it's also good for live-stack/EAA applications but I haven't tried that yet. You missed one that is actually a nice option for Mac users, Starry Sky Stacker. It's not free- I think it's about $25 but it's quick and fairly intuitive.

What a great comparison! Even if people might weigh the points differently, they could easily do that themselfes now. Now I just wish you'd extend this to include more software (crazy that there is so many tools for stacking), like startools, maybe fitsworks or GRIP (both quite niche).. :)

Hi, great video, Affinity was my first AP tool, for all, and has an easy multi night stacking.

I think where Sequator really shines are those wide Milky Way shots that include the ground - perhaps with quite a bit of light pollution - rather than deep sky astrophotography. It was dead simple to get results for an otherwise complicated scene.

Great video - glad you limited the comparison to just stacking. I own both Pixinsight and APP. I have a personal hatred for the Pixinsight UI and love the one or two click processing workflow of APP, but perhaps Ill use PI for stacking only. Ill go insane if I have to use PI for anything else ;)

If anyone is wondering the outro song is Milky Way Express by Lupus Nocte

EXCELENT WORK!!! Thx Very Much!

Great video. I now use a combo of SiriL and Affinity. Ideal for OSC images. I never use scripts since SiriL does not know how to automate if using master darks and flats. Just wish there were more KZfaq tutorials on how to really exploit the astronomy toolsets from these systems vs the Big Gorilla of PI…

In APP you can set all the tabs up for multiple filters and hit integrate - you do not need to do each step individually. Personally I much prefer to do my calibration and stacking in APP and then move to Pixinsight for processing. It is also way easier to create mosaics in APP than Pixinsight (again personal opinion).

I'm just trying out astrophotography. I'm glad to have stumbled onto this comparison! 👍👍

I usually use DSS and/or SIRIL. In the case the photometric color calibration is working, I think SIRIL does better than DSS. But if it doesn't work it creates color issues that I can't handle as beginner. Definetly will give ASTAP a try. Never heard about it within the astrophotography community in Germany.

Hello Nico, I really dig your videos, your production values are on point. May I suggest one thing though? Ever think of adding those time stamps throughout your videos? It would help, especially in a video like this with a bunch of different programs being compared. Keep up the good work though, you're killin it.

Once you modify a script or two, SiriL is a breeze to operate. One thing I learned how to do is to write a script that uses a synthetic bias--there's a tutorial on it, (as are there other tutorials). This eliminates taking an extra set of bias exposures, and actually eliminates a potential noise source otherwise introduced by the bias shots that can't be removed. Yes, there is a learning curve with SiriL, but for the price, this program does a great job. Also, just want to say I cut my teeth on Sequator--I would recommend it to the absolute beginner owing to its simpicity.

Great job Nick! I'd like to see a side by side comparison of Affinity and Photoshop on the same image if you get bored someday.

great video thank you

Comparison reviews are great

Thank you. This was a very comprehensive and useful video. Like you, I mostly only used DSS and Pixinsight but now I'm actually curious to try out Astap and Siril. -If it's possible, could you please upload the final result for each program somewhere so we can do a side by side comparison? It's rare you get to see the same data set tried on so many different programs so the variables that would change the final output would be really low in your experiment.- Nevermind, I should have watched the video till the end lol Thanks for the video again!

Great video as always Nico! :)

I would redo the Sequator test using "select best pixels: strict", "high dynamic range", and "remove dynamic noises." This is my preferred stacking software since, with these options, it gives good detail while preserving color. DSS and Siril tend to murder color.

Great review; although I would have given DSS a 3 instead of a 2 in the speed column - it is twice as fast as PI, and I have heard horror stories on PI forums about the complexity, issues, and the amount of time it takes to get WBPP running (of course once those issues are overcome, then it becomes easier on the next project - just a huge learning curve). Overall you did a fabulous job in reviewing these eight stackers. Bravo!

I like the video, you did a good, but kind of basic outline of feature. However, there is the continued push towards Pix Insight. You are docking APP for its UI, and yet giving pie a better score. How you weighted Speed was also I thought a bit biased, because what is more important than time. When you are waiting for system to process stack your images. I can stack and remove the noise in far less time than it takes Pi or APP to stack. I do appreciate what you are doing and how well you did present most things. However, the UX UI for Pi, is horrible, and to say they are not, gives me a feeling that someting isn't right in the evaluation, especially since SIRIL is obviously way more intuative, less confusing, faster, and just a great product, and did I mention FREE !! Appreciate yoru work. Much respect. Clear Skies !!

Hmm, I'm feelin salty about that APP score. GREAT video and comparison though! Not at all surprised APP came dead last for speed. That I can live with, since I spend sometimes months collecting the data, an hour on my computer crunching numbers doesn’t both me. I am VERY curious about the noise comparison between it and PixInsight, I'll have to study those tiffs.

Fantastic video! I mainly uses siril for stacking and pre processing. As you say it always produces a little bit more of noise and the sars appear bigger and brighter compared to pixinsight. Still, a great program tho, and it’s free!!

I am skeptical about the review of quality of the stacked image for Astro Pixel Processor. I am not saying that the result that you got was better than it was but more that APP provides extensive stacking options. The end result varies a lot depending on the options selected. The default result if you choose automatic is mostly good and I often use this when I stack nightly results. For context I frequently am working on project that run many nights, usually at least 3 or 4 nights on a single subject and I have also done mosaics of large regions of the sky made up of many panels and up to 20 full nights of images with various filters. So I stack each nightly to evaluate overall quality then tweak which lights to include or not then dump the calibrated images for later stacking. When I do my final stacks of calibrated images I usually wind up stacking it several times with various tweaks to the settings. The differences are sometimes subtle but sometimes are significantly better wit a bit of tweaking. So I do not think it is fair to evaluate quality based on default settings alone. One other point is that APP kind of excels at stacking data from different nights the LNC correction and LNC rejection are very useful when shooting on different nights with different gradient sky glows. For example I was recently stacking some narrow band data some taken during the new moon and some taken close to the full moon with fairly extreme gradients. Using these features I was able to stack all of this data together and tweak the settings to come up with fairly good results better I think than many of the other stackers I have tried. In addition to this if you use different camera and optics I am not aware of any stacker that handles this as well as APP. It also creates very good distortion models when stacking with extremely wide angle lenses. For example large milky way mosaics using 14mm lens that sort of thing. I have not seen any other stacking software which does as good a job as this. I do agree that it is a bit slower than Pixinsight stacking and others as you pointed out. I noticed this when I first started using it but personally I decided that I really did not care that much how long it takes to stack. I usually do stacking as a background process while I am working on something else anyways. Even the fastest stackers take more time than I want to hang around and wait for them to complete. Given this it does not matter too much if it takes 10 minutes instead of 5 minutes or whatever, either way you have to kick it off and do something else for a while anyways. So for me how long it takes to stack is much less important than features and end quality. Sometimes it is a bit of a burden for example the large mosaics take a LONG time to process. I am mostly using an ASI 294 mm for those with 1x1 binning which produces 96 MB files, stacking many hundreds of these can take a long time. The longs was the 8 panel mosaic with R, G, B, Ha, SII, and OIII over 19 nights, the final stack for this took many hours I think it was at least 12 hours maybe longer. But I just kicked it off overnight. I guess this is where stacking time might have some importance. But to me it is still much less important, bit it would be nice if it was faster.

An enhancement to your evaluation would have been to try stacking some non-ideal, narrow field, subs from an SCT. Sometimes DSS won't even stack such subs, but Affinity photo will, and I bet some of the other programs would, too. Also, the non-linear stretching you mention for Affinity photo can be easily disabled with a mouse click, getting you back to the raw stack for any photometric work that a person would like to do.

Great video❤

There is a macOS stacker that didn’t make the list: Starry Sky Stacker. I was using it as an easier and faster alternative to DeepSkyStacker and PixInsight (though I now have gravitated to PixInsight). Here are my personal and subjective scores for Starry Sky Stacker (trying to use your scale) after doing a half dozen nights in all three tools. Price: 1 ($25) OS: 1 (macOS only) UI/UX: 2 (Clean, but quirky; also the creation of master flats and master darks is not at all obvious; I've had to re-read the instructions and watch videos multiple times) Features: 2 (Just the basics, use bias or dark flats not clear; not many options) Speed: 3 (I find it to be much faster that PixInsight and Deep Sky Stacker; I admittedly haven't quantified the difference recently) Final result: 4 Total: 13 Bottom line opinion: Fine little stacker, but unintuitive in spots and you quickly outgrow it.