A feature-set driven by the community

Protect your data

Create and store photos, videos, or audio without fear for your physical and digital safety.

  • Encrypt your files: Tella automatically encrypts all of your files in a separate gallery as soon as you upload them.
  • Hide your files in the device: Your files are inaccessible from the phone’s regular gallery or file explorer. You can only access them in the app.
  • Lock your files with a security pattern: Set the security pattern of your choice. Entering the correct pattern is the only way to decrypt your content.
  • Mask the app: By changing its name and icon, you can hide the app from searching your phone and keep using all its features.

Document evidence

Easily and quickly collect data using the methods that best suit your needs.

  • Use customizable forms: Tella’s forms can help you organize and effectively collect the specific data you need.
  • Save forms in offline mode: In areas with limited or no internet connection, you can save files on your device and submit them when you reach a reliable internet connection. 
  • Upload files directly: You can quickly upload files directly to your organization’s server in seconds, with the auto-upload and auto-delete options. 
  • Make your evidence verifiable: Activate “Verification Mode” to have Tella automatically collect metadata about the files you produce and corroborate the evidence.

Get started easily

Tella is free, multilingual, and open-source.

  • User-friendly: We design Tella to be as easy to use as possible, even for those with limited tech literacy.

  • Free forever: Tella is designed for those whose safety is at risk. It is free to download and use, and will remain free forever.
  • Choose your language: Tella is currently available in Belarusian, English, French, Portuguese, Russian, and Spanish.
  • Trust the code: The code for Tella is open-source and publicly available so that researchers, security analysts, and developers can freely audit and reuse it.

Download Tella


Get it on Google Play

Tella for iOS is coming soon! Notify me

Tella is a project of Horizontal, a nonprofit organization serving frontline defenders, activists and journalists through digital security support and tool development.

Get it on Google Play