Optimize Your Click-Through Rate

It compares thumbnails on brightness, contrast and saturation so you can pick between variants on measurable grounds rather than preference. It is for choosing between options you already have, where the clickability scorer is for diagnosing a single image.

No. Analysis happens in your browser and nothing is sent to a server or stored. You can close the tab and no copy of your thumbnail exists anywhere but your own device.

Whether the differences survive at small size. A contrast gap that is obvious at full width often disappears in a sidebar at 168 pixels wide, and the sidebar is where most impressions happen. If two variants converge when shrunk, the difference is not worth arguing about.

Yes, free and ungated like every tool here. No sign-up, no email, no watermark.