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VScan

A visual perception layer for the blind
New in version 0.2.3
- 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.

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.

  • app screenshot
  • app screenshot
  • app screenshot
  • app screenshot

Versions

Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

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  • Version 0.2.3 (23) suggested Added on Oct 18, 2025

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 7.0 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • access sensor data at a high sampling rate
      Allows the app to sample sensor data at a rate greater than 200 Hz
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • android.permission.READ_EXTERNAlSTORAGE
    • record audio
      This app can record audio using the microphone while the app is in use.
    • android.permission.WRITE_EXTERNAlSTORAGE
    • com.rastislavkish.vscan.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 6.6 MiB PGP Signature | Build Log

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