Documentation

Learn how to validate thumbnails, run live tests, and get the most out of ThumbnailTools.

Start here

Core concepts and how ThumbnailTools fits your workflow.

Guide
What is ThumbnailTools?
Validation-first platform for YouTube covers: AI diagnosis, preference tests, and automated A/B.
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Core
AI Test (Layer 0)
Instant, explainable scores for legibility, focus, clutter, and message clarity.
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Core
Live A/B testing
Unlimited variants, bandit traffic allocation, and bias-aware measurement.
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Workflows

Practical paths for creators, freelancers, and teams.

Account & data

Plans, privacy, and how we handle your assets.