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About this tool
Compare two logos using algorithm-powered visual analysis. Analyze shape, color, layout, and typography similarity entirely in your browser.
Logo Similarity Checker scores how closely two logo images resemble each other by comparing them on eight weighted visual signals — pixel-level RGB distance, Sobel edge structure, a 256-bin grayscale histogram, horizontal symmetry, aspect ratio, brightness, contrast and edge complexity — and rolls them into a single 0-100 similarity score. Both images are downscaled to 256px on a canvas and analysed in the page, so nothing about an unreleased mark leaves the device. Designers, founders and brand reviewers get a per-dimension breakdown (shape, colour, layout, symmetry) plus a k-means palette match instead of a gut-feel yes or no.
Open Logo Similarity Checker on AltFTool — it loads instantly in your browser.
Paste your code or data sample into the workspace.
Pick the format, conversion, or analysis you need.
Copy the polished result straight back into your project.
Pixel, edge, histogram, symmetry, aspect, brightness, contrast and complexity are weighted separately so a colour swap does not hide identical geometry.
K-means pulls the five dominant colours from each logo and pairs them by RGB distance, showing which specific swatches collide.
Scores land in High, Moderate, Low or Very Low bands so a review has a shared vocabulary instead of arguing over decimal points.
A score of 80 or above is flagged High, 60-79 Moderate, 40-59 Low and anything under 40 Very Low. High means the two marks share pixel layout, edge structure and tonal distribution closely enough that a human reviewer would likely see a resemblance — treat it as a prompt to investigate, not a conclusion.
It is a weighted blend: pixel similarity 20%, Sobel edge similarity 20%, grayscale histogram intersection 15%, complexity 20%, symmetry 10%, and 5% each for aspect ratio, brightness and contrast. Each component is computed on both images after they are resized so the longest side is 256 pixels.
No — this is a visual analysis tool, not a legal determination. Trademark infringement also turns on the goods and services involved, registration classes, market confusion and prior rights, so use the score as a screening signal and consult a qualified trademark attorney before acting.
Yes. Alpha is read directly, and pixels with alpha below 128 are excluded from the dominant-colour clustering so a transparent background does not register as a brand colour. Files of different dimensions are each rescaled to a 256px bounding box, and the size difference itself is captured by the aspect-ratio component.