Test your YouTube thumbnail before you post
Upload a thumbnail and Visuals scores its click appeal, shows where attention lands with a heatmap, and lists quick fixes you can auto-apply. It rates appeal, not guaranteed clicks, so you fix the first impression before it goes live.
YouTube only covers the timestamp corner, so almost all of your thumbnail is in play.
- HOTfirst look
- WARMsecondary
- COOLtertiary
- COLDlow
- DEADalmost none
Predicted from visual composition, not measured eye-tracking.
What you get
A click-appeal score, and the map behind it
Upload one thumbnail, pick your platform, and Visuals breaks down the first impression the way the algorithm and the human eye see it. This is thumbnail testing before you publish, not after. Here is everything it returns.
01The score
A 0 to 100 click-appeal score
Visuals scores how well your thumbnail earns the click, an early read on click-through rate (CTR), weighted for the platform you picked. The same image scores differently for YouTube long-form than for TikTok, because each format rewards a different first impression. The number is a strong pre-publish signal, not a promise of clicks.
02The attention heatmap
See where the eye lands first
Visuals predicts the attention map of your thumbnail from its composition. The algorithm reads faces, text, and focal points and models where a viewer looks first. The hottest zones are where the eye goes immediately. The dead zones are where attention drops to almost nothing, like an empty background or the side away from your subject. Move your face, your hook text, and your focal point into the hot zones so the first glance works for you.
- HOTfirst look
- WARMsecondary
- COOLtertiary
- COLDlow
- DEADalmost none
Predicted from visual composition, not measured eye-tracking.
03The framework breakdown
Six checks behind the score
Every thumbnail is graded on six frameworks, each scored on its own so you know exactly what to fix. The bar colors follow the same score scale you see inside Visuals.
Face & Emotion Impact
Faces, expression, eye contact, and how large the face reads.
Color & Contrast
Saturation, contrast, and whether the colors pop at thumbnail size.
Composition & Layout
Rule of thirds, focal point, and visual hierarchy.
Text Optimization
How much text, how big, where it sits, and whether it stays legible.
Engagement Triggers
Curiosity, a pattern interrupt, and a reason to click now.
Technical Quality
Resolution, sharpness, and how it holds up on a small mobile screen.
04Quick fixes
Fixes you can act on, in order
Visuals turns the analysis into a short, prioritized list of changes, the highest-impact one first. Brighten the face, raise the text contrast, move the subject off the dead side. Each fix is specific to your image, not generic advice.
Brighten the face
Do firstIt sits in shadow; lift exposure so the expression reads first.
Raise the text contrast
The hook blends into the background at small sizes.
Move the subject off the dead side
Shift your focal point into the hot zone, left of center.
05Auto-improve
Apply the fixes, see the before and after
Pick the fixes you want and Visuals generates an improved version of your thumbnail with those changes applied. You get a before-and-after with the new score, and you can download the result. You stay in control of which changes to keep.
79/100
93/100Auto-improvedWhere Visuals fits
The last check before the thumbnail goes live
Visuals is the visual layer on top of the rest of PreViral. You validate the idea, discover the format, build the plan, make the video, and Visuals makes sure the thumbnail earns the click. If a thumbnail designer makes your covers, Visuals gives them the same eye you would bring, so the team can decide without you in the loop.
Visuals
Score and fix the thumbnail so the first impression lands.
You are hereVisuals is part of the Growth plan, alongside Blueprint. see Growth pricing.
FAQ
Questions about Visuals
How Visuals scores your thumbnail and shows where attention lands before you post.
Can't find what you're looking for? Contact us.
A thumbnail tester. Upload a thumbnail and get a 0-100 click-appeal score, a framework breakdown, an attention heatmap, and quick fixes you can auto-apply to generate an improved version. Visuals is part of the Growth plan.
No. It rates click appeal from composition, text clarity, emotion, color, and algorithm fit. It is a strong pre-publish signal, not a guarantee of real clicks, which also depend on your title, topic, and audience.
It predicts where viewers' attention is most likely to land on your thumbnail, based on visual composition, so you can check that your face, text, and focal point sit in the high-attention zones.
You pick a platform (YouTube Shorts, YouTube long-form, TikTok, Instagram Reels, and Facebook Reels) and Visuals scores against that aspect ratio. A comparison shows how the same thumbnail crops across formats.
After you review the quick fixes, Visuals can generate an improved version with the selected changes applied, show a before-and-after with the new score, and let you download it.
Fix the first impression before it goes live
Visuals is part of the Growth plan. Upload a thumbnail, see where attention lands, and auto-improve it before you post.
Last updated 2026-06-24