Tella
Tella is a free, open-source security app for Android. Encrypt and hide files on your device. It has 113 GitHub stars and is released under the Apache-2.0 license, and you can install it from F-Droid and Google Play.
github.com/Horizontal-org/Tella-Android (opens in a new tab)
About Tella
In challenging environments with limited or no internet connectivity or in the face of repression Tella makes it easier and safer to document events, whether that’s violence, human rights violations, corruption, or electoral fraud. ENCRYPTION: All of the content and data stored in Tella are encrypted. This means that unless the app is unlocked, all the data within Tella will remain inaccessible. FILE MANAGEMENT: Take photos, videos, or audio recordings directly in Tella, or import documents from your phone, and easily organize your files in folders. CAMOUFLAGE: Change the app icon and name to a seemingly harmless one, such as a calculator or a camera.
Privacy and F-Droid
F-Droid builds Tella 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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What is Tella?
Tella is a free, open-source security app for Android. Encrypt and hide files on your device. It has 113 GitHub stars and is released under the Apache-2.0 license, and you can install it from F-Droid and Google Play.
Is Tella free and open source?
Yes. Tella's source code is public on GitHub under the Apache-2.0 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 Tella?
You can install Tella from F-Droid (package org.hzontal.tellaFOSS) and from Google Play; the links are on this page. Its GitHub repository also publishes releases (latest: v3.4.0(258)).
Is Tella still maintained?
The repository's most recent commit was on Oct 6, 2026. Its F-Droid listing was last updated on Aug 28, 2026. appsgit only lists apps whose repository had a commit in the last six months.