Show HN: Free AI Thumbnail Tester (based on real YouTube data)

2 sachou 0 6/30/2025, 12:46:35 AM aithumbnail.so ↗

I built this free tool to analyze YouTube thumbnails using a proven checklist I first found on Reddit. It grades clarity, contrast, text readability, and visual hierarchy, all using AI.

It's now live on aithumbnail.so. I believe it’s one of the most accurate tools out there for thumbnail testing.

Would love feedback, ideas, or bug reports!

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Show HN: Free AI Thumbnail Tester (based on real YouTube data)

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