Ship the cover that actually wins the click.
Diagnose a cover at feed size, then run a live A/B for view deltas. Join the waitlist - or enter now with Founder Pack.
Be first when we open. No spam - launch only.
Sample head-to-head
One video · two covers · traffic split in the wild
AWinner
BThe cover you almost skipped might be the one that scales.
Evidence in, guesswork out
Score before you ship
Legibility, focus, and clutter in seconds - before the upload.
Thumbnail + title together
CTR is a pair. Test the combo, not isolated assets.
Traffic follows winners
Live A/B with smart allocation - more views on what works.
Private by default
Your channels and tests stay yours. Opt-in only for training.
Validation, not another tool pile
One flow from “which cover?” to “we know which one works” - AI first, real channel tests when you’re ready.
Diagnose at feed size
Legibility, focus, clutter, and contrast from the pixels in seconds - before you hit publish. Not a CTR guess.
AI Test on the channel
Rotate as many covers as you need. Included in the plan. We measure view-count change - YouTube does not give thumbnail CTR via API.
Pair thumbnails with titles
CTR is a combo, not a solo act. Spot when on-image text just restates the title.
The why, not a mystery score
Every Diagnose number comes with a reason you can check at 168×94. AI Test reports view deltas per window.
Seen at real feed size
Preview how it looks tiny on mobile, next to competing videos - not full-screen fantasy.
Built for weekly uploaders
Founder Pack is the live early-access SKU. Diagnose is free; AI Test slots come with the plan.
From draft to decision
Fast pre-publish signals when you need speed. Real A/B truth when you need certainty.
Bring a candidate
Upload a draft cover (title optional) or link a video from your connected channel.
Diagnose it
Get an explainable visual score at feed size, plus an attention map. Then rotate live when you need field truth.
Lock the winner
Ship the variant that gained views in its window, re-test older uploads, and keep a trail of what moved.
Get launch access first
Join the waitlist for ThumbnailTools - evidence-first thumbnail tools for creators who refuse to guess.
No spam. One email when we open.
Founder Pack is the live SKU.
Plans are locked in - checkout opens when we launch.
Something sharp is on the way.
ThumbnailTools is almost ready. Evidence-first covers for creators who refuse to guess.