Free · no account · runs on our server

See what last night could have looked like.

Drop the frame straight off the scope. We measure it, work out what was actually achievable under that sky, and hand it back processed so you can see the difference rather than read about it.

Eleven measurements off your pixels, not opinions
Graded against what that night allowed, not against perfection
Corrected preview, and palettes where they are physically real

Nothing is guessed and nothing is generated. The same frame always produces the same verdict, and the rubric is published.

Drop a file, or browse JPEG, PNG or FITS · up to 40MB

A stacked JPEG is already stretched, so real signal-to-noise cannot be measured from it. We say which numbers we could not take rather than inventing them.

What did you point with? What is it? optional Night shot Minutes of integration Latitude Longitude

Coordinates are what let us tell you what the moon was doing.

3 of 3 free analyses left on this browser.

What the paid tier replaces