Blink Comparison
Blink Comparison is a free, open-source photo and gallery app for Android. Simplifies comparing photos of tamper-evident seals using your eyes. It has 304 GitHub stars and is released under the GPL-3.0-or-later license, and you can install it from F-Droid and Google Play.
github.com/proninyaroslav/blink-comparison (opens in a new tab)
Data as of from the GitHub API and the F-Droid index; description from the project's repository or F-Droid listing. Report an error
About Blink Comparison
The concept of "blink comparison" method is simple - the app allows you to quickly switch pictures without delay so you can see the differences. "Blink comparison" method uses high efficiency pattern recognition by human eyes, to permit quick verification between a reference picture and an actual one being taken on the spot. For example, in the goal of detecting tampering in high contrast nail polish tamper-evident seals.
Privacy and F-Droid
F-Droid builds Blink Comparison from its published source code and flags anti-features such as ads, tracking or reliance on non-free services.
No anti-features flagged on the latest F-Droid build.
Screenshots
Screenshots from the app's F-Droid listing.
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Is Blink Comparison free and open source?
Yes. Blink Comparison's source code is public on GitHub under the GPL-3.0-or-later license, which is OSI-approved or FSF-free. F-Droid, which builds it from source, flags no anti-features such as ads or tracking on its latest build.
How do I install Blink Comparison?
You can install Blink Comparison from F-Droid (package org.proninyaroslav.blink_comparison) and from Google Play; the links are on this page. Its GitHub repository also publishes releases (latest: 1.2.1).
Is Blink Comparison still maintained?
The repository's most recent commit was on Jun 30, 2026. Its F-Droid listing was last updated on Oct 27, 2024. appsgit only lists apps whose repository had a commit in the last six months.