# Blink Comparison (open-source photo and gallery app)

> 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 302 GitHub stars and is released under the GPL-3.0-or-later license, and you can install it from F-Droid and Google Play.

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.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/proninyaroslav/blink-comparison |
| Platforms | Android |
| Built with | Flutter |
| GitHub stars | 302 |
| License | GPL-3.0-or-later (open source) |
| F-Droid | https://f-droid.org/packages/org.proninyaroslav.blink_comparison/ (package org.proninyaroslav.blink_comparison) |
| F-Droid anti-features | none flagged |
| Google Play | https://play.google.com/store/apps/details?id=org.proninyaroslav.blink_comparison |
| App Store | not linked |
| Website | none listed |
| Official | no |
| Category | Photos, gallery & camera |
| Latest release | 1.2.1 (Oct 22, 2024) |
| Last commit | Jun 30, 2026 |

F-Droid builds its apps from source and flags anti-features: https://f-droid.org/en/docs/Anti-Features/

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