A visual perception layer for the blind
About this app
This is a little project of mine aiming to research how vision LLMs could help out blind people on travel and in their every-day life by substituting eyesight for various visual tasks. VScan turns your smartphone's camera into a device for visual perception. You can define various optical cognitive functions, like looking for objects, signs, evaluating a scene or simply mediating visual impressions. You can afterwards use these functions on the camera view, just like a sighted person would use their eyes to achieve a specific goal in the physical world.
Each cognitive tool consists of two major parts: • The camera to be used - front / back, as well as camera parameters - resolution, flashlight etc. • The prompts used for LLM processing. LLM is the bridge between raw pixel data and your interpretation of it, and in the user/system prompt, you can specify what exactly are you interested in for the particular function and how should it be communicated, as well as the LLM model that should be used.
Camera input in combination with an LLM processing prompt forms a cognitive function, which can be used to serve various visual tasks.
VScan is open-source software. Visit the project's official repository to learn more about its background, motivation, specific usage examples and setup instructions.
Licensed under GPL-3.0-only, by Rastislav Kish.
What's New in v0.2.4
Imported from the F-Droid repository index.
- - Added support for reasoning models. VScan now allows configuring the amount of tokens a config can spend on a task, and setting the reasoning effort to be used in the process.
- - The conversation screen got a major rewamp. Now it offers detailed information about token usage of the entire conversation, as well as individual generated messages. If the model includes reasoning in its output, it can be displayed separately for each response. The conversation list now also supports accessibility ac
Version history
Jun 21, 2026 · 6.7 MB · Android API 24–36 · code 24
Imported from the F-Droid repository index.
- - Added support for reasoning models. VScan now allows configuring the amount of tokens a config can spend on a task, and setting the reasoning effort to be used in the process.
- - The conversation screen got a major rewamp. Now it offers detailed information about token usage of the entire conversation, as well as individual generated messages. If the model includes reasoning in its output, it can be displayed separately for each response. The conversation list now also supports accessibility ac
SHA-256 68d39988a200188624b0a770c4fec8ae8ba8e54e4ae44935447e928f9f1cf51e
Oct 18, 2025 · 6.6 MB · Android API 24–36 · code 23
Imported from the F-Droid repository index.
- - There is now a standalone editor for entering the system prompt and user prompt. This editor has a large text field, which should make it easy to work with long and complex prompts.
- - Various UI improvements and bug fixes.
SHA-256 0564dabbf3aae9df6a00cd0ca2e3517339f504b81998d84a1400c16379205354
Will it run on your device?
92%
- Runs on a broad range of modern Android versions.
- Multiple CPU architectures are covered.
- Aligned with the latest Android target SDK expectations.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
How to verify the file you downloaded
Before you install anything, confirm the file is the one described here. On a computer, run shasum -a 256 your-download.apk (macOS or Linux) or certutil -hashfile your-download.apk SHA256 (Windows), then compare the output character-for-character with the SHA-256 on this page. If a single character differs, the file is not the build we recorded — delete it.
What the signing certificate proves
Every Android app is signed with a private key that only its developer holds. The fingerprint on this page is a hash of the matching public certificate, and it proves continuity rather than identity: it tells you a build came from whoever signed the earlier ones. Android enforces this at install time — if a package claiming to be com.rastislavkish.vscan is signed with a different key, the system will refuse to install it over your existing copy. A fingerprint that changes between releases is worth pausing on, because a repackaged app that has been modified by someone else cannot keep the original signature.
How to roll back to an earlier version
If the current release misbehaves, 0.2.3 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall VScan first — which clears its local data unless you have a backup. Reinstall the older APK only if its signing fingerprint matches the build you already trust, and check the API range: an older release may target an Android version your device has moved past.
Why we list sources instead of hosting everything
The official store channel is almost always the right choice: it updates automatically and carries the publisher's own distribution guarantees. A direct APK is useful when a device has no store access, when a rollout has not reached your region, or when you need a specific version — and only when the publisher has authorized that copy. APKBrowse does not list pirated, cracked, or unauthorized rebuilds of VScan, and a listing is removed when the evidence for it stops holding up.
Get VScan
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Other sources
F-Droid listing
officialF-Droid builds this app from source and signs it. This is its official listing, with older builds and full release notes.
Source code
verified publisherThe upstream repository this build is compiled from.
We check legality and signature continuity, but device behaviour still varies. Install at your own discretion.
App Information
Security Verification
We record provenance; we do not run malware scans. Verify the hash yourself before installing.
SHA-256 Hash
68d39988a200188624b0a770c4fec8ae8ba8e54e4ae44935447e928f9f1cf51e
Signing certificate
e280928ae2030e20b15bf024aad830e5435653d4a90017c3bbf340e4cb28232c
Permissions Required
What each permission lets VScan do. A highlighted one is worth a second look — not necessarily wrong, just worth asking whether this app needs it.
Previous Versions
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