Terms
Free to use, for anything, including commercial work. Your photographs stay yours.
Your images
You keep every right you had in the photographs you open here, and in the stacked image the tool produces from them. Nothing is uploaded, so no licence to your work is granted to anyone by using this site, and none is asked for. Sell the result, print it, publish it — it is your photograph.
You are responsible for having the right to use the images you stack.
What the tool promises
That it does what these pages say it does: it equalises each frame’s background before the lighten blend, it computes the gap-fill radius from your EXIF, it repairs small persistent bright defects, and it masks long thin single-frame streaks. The measured results quoted on this site come from the real data named on the about page, and the limits of those measurements are stated there rather than hidden.
What it does not promise
It is provided as it is, with no warranty of any kind. It may fail on a file format it has not met, run out of memory on a large sequence, or produce an image you do not like. It makes no promise about any particular result on your data: the measured gain is from one camera on two nights, and your night is not that night.
Keep your original files. This tool never modifies them — it only reads them — but no browser tool should be the only place a night’s work exists.
Availability
There is no service-level promise. The site may be unavailable, may change, or may stop. Since it is static files and does the work on your machine, a page you have already loaded keeps working with no network at all.
Liability
To the extent the law allows, no liability is accepted for any loss arising from using this site. Nothing here removes any right you have as a consumer that cannot be removed by agreement.
Names
Sequator, StarStaX, StarTrails.de, Siril and aerotimelapse.com are named on this site only to compare them factually. Those names belong to their owners and this site is not affiliated with, endorsed by or connected to any of them.