Support and contact
Email sent to support@startrailstacker.com reaches a reader. A person reads it. Send a short description of the problem, without photographs or full sequences.
Before you write
Most questions already have a page with the measured answer.
- My trails are dottedthe pause between frames, and the arithmetic that fixes it
- Will it read my files?formats by mode, and what has actually been through it
- It refused my framesevery refusal, the words it uses and what to do next
- Which browser should I use?memory per browser and what each one cannot do
- Which file do I open next?the 16-bit PNG, the FITS, and Lightroom or PixInsight
- Darks, flats and biaswhen they help and when to skip them
If a sequence will not stack
Please do not send the photographs. They are yours, they are large, and the useful diagnostic details fit in a short message:
- the camera, and the file format you exported (JPEG, PNG, TIFF, WebP, 8-bit or 16-bit);
- how many frames, and roughly what resolution;
- what the page said — the exact wording of the message, and which stage it stopped at;
- the browser and operating system.
If the tool refused because of memory, the message includes the number it needed and the number it was offered; those two figures are the most useful thing you can send.
If something on the site is wrong
The measured claims here are checkable and the underlying data is public. If a number looks wrong to you, email which one and why so it can be investigated.
Common questions
- Are my photographs uploaded?
- No. Every frame is read in your browser tab on your own device, and the result is made there. See privacy.
- Does it work on a Mac?
- Yes, in Safari, Chrome and Firefox; star trail stacking on a Mac compares it with the desktop options.
- Is there a desktop app?
- Desktop apps for macOS, Windows and Linux are in development, and no build exists yet. The download page says when that changes.
- What does it cost?
- Nothing during the beta: nothing can be bought and no card is asked for. The plans page shows what is planned after the beta.
Current contact status
The support address is active. We cannot promise a response time. Please use only the address shown here and do not attach photographs, source sequences or sensitive account details.
