Stress-test your logo
in seconds.
Drop in your logo and see how it really holds up — at favicon size, in one color, on light and dark — plus a quick read on contrast, color count and clear space. It runs entirely in your browser; your file never leaves your device.
Drop your logo here
At favicon & app-icon size
One color & on light / dark
Measured, not guessed.
Seven checks run on your file in the browser — color, contrast, detail, one-color, clear space, transparency and light/dark. No upload, nothing stored.
A real mark holds up at any size
, in one color
, on anything.
The stress-tests a logo has to pass.
Each one is measured on your file and shown back to you as a real preview — not a vague score.
Reads tiny
Low enough detail to stay legible at favicon and app-icon size.
Survives one color
Holds together as a solid stamp — for embossing, fax-grade print, foil.
Strong contrast
Figure and ground separate cleanly so the mark never reads as mush.
Works anywhere
Legible on both light and dark, with a transparent background to match.
Common questions.
Is it really free?
Yes — no sign-up, no card. Upload a logo and get the full breakdown.
Does my logo get uploaded anywhere?
No. Everything runs in your browser via the canvas API. Your file never leaves your device.
What does it check?
Color count, contrast, legibility at favicon sizes, one-color survivability, clear space, a transparent background, and light/dark versatility.
What's a good score?
It's guidance, not a verdict. Use the per-check notes to see exactly what to improve — a low score on detail just means the mark may blur when tiny.
This is one small corner of VisionLabs.
A private, multi-model AI studio for European creators and brands — logos, brand kits, websites, motion and more. See the whole thing.