Apps: Score a YouTube thumbnail and get three specific fixes

Apps
Apps

Thumbnail check

Examples

This session

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About Thumbnail check

Score your YouTube thumbnail before you publish

Thumbnail check reviews a thumbnail the way a packaging strategist would: a score out of 100, then notes on readability at phone size, the focal point, contrast against light and dark feeds and the hook, with three concrete fixes. Add your video title to check that the two work together. The review is free, and you can apply the fixes to make a new version.

Free, about 8 seconds, made withGemini 3 Flash

Examples

Thumbnail check input: thumbnail
Original
Thumbnail check example after applying the fixes
After the fixes

Score

42/ 100

The subversion of expectations is clever, but the cluttered background and tiny text make it look unprofessional and hard to parse at a glance.

Readability
No, the text "I built a tiny house in 30 days" is far too small and placed in a corner where it will be obscured by the duration overlay.
Focal point
The man holding the miniature house is the central focus, but the excessive detail in the surrounding garage shelves distracts the viewer from the main subject.
Contrast and color
Poor contrast as the subject's dark shirt and the pale wood house blend into the grey and brown tones of the workshop, failing to pop against feed backgrounds.
Hook
The visual joke of a birdhouse being called a tiny house creates curiosity through irony, effectively signaling a comedic or satirical tone that subverts the literal title.
Top fixes
  1. 1Remove the redundant small text
  2. 2Apply a heavy blur to the garage background
  3. 3Brighten the lighting on the man's face and the wooden house to increase visual separation

Reviewed with the title “I built a tiny house in 30 days”, then fixed

Questions

What does the score mean?

It is the reviewer's overall judgement of how likely the thumbnail is to earn a click, from 0 to 100. Use it to compare versions of your own thumbnail, not as a prediction of views.

Is it free?

Yes, the review is free. Apply fixes creates a new version with Nano Banana 2.1 for 3 credits.

Does it know my channel or niche?

No. It only sees the image and the title you give it, so weigh its notes against what you know about your audience.

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