AkastroidFree tool
Measure one frame in your browser
Drop in one frame, either a single sub or a finished image. This page measures star shape, background gradient, clipping, noise and hot pixels with the same code as Akastroid's desktop app, and shows you the numbers. Nothing is uploaded. It runs in your browser.
Drop an image here, or click to choose one
JPEG, PNG or TIFF · analyzed on your machine, never uploaded
Measuring...
Measured
This is a single-frame read
Akastroid compares every frame in a real session against every other frame, which is what tells a tracking problem apart from your optics. A single photo can't do that on its own. The desktop app measures a whole night.
Download AkastroidWhat each measurement means
These are the same numbers Image Doctor computes on every frame of a real session. That page explains how they combine into a per-frame score; here, each one stands alone.
To plan a night rather than review one, the Session Planner shows target altitude, moon interference and a suggested order for tonight. It is also free and also runs in your browser.