Mobile app · Security & privacy

Kryptos

Encrypt inside any messenger: the keyboard encrypts, the screen decrypts.

Completely free
Android and iOS
Open source

Ad-supported exit link (Clictune): an intermediate page may show for a few seconds before the official website. Direct link to the website, no intermediate page

Download for Android (F-Droid)

Link to the official download page, ad-supported (Clictune): an intermediate page may show for a few seconds. Direct link to the download

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Geographic availability: No geographic restriction found in our sources; availability is not checked country by country.

Technical details

Pricing: Completely freeconfirmed by F-Droid
License: AGPL-3.0 — Open source (copyleft)confirmed by F-Droid
Open source: Yes
Commercial use: Yesconfirmed by F-Droid
Account required: not documented
Credit card required: Noconfirmed by F-Droid
Watermark: Not applicable
Ads: No
Platforms: Android and iOSEstablished by Android: F-Droid, Unspecified source · iOS: Unspecified source
Publisher: datakeeper
Latest version: 2.4 (22 September 2026)
Latest activity: 22 September 2026
Source code: github.com/swisslite/Kryptos

Overview

Features described on its official website, in its F-Droid listing and in its GitHub repository: end-to-end encryption, themes and dark mode, data encryption, version history.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information

“Kryptos — end-to-end encryption for any messenger, built on the Signal Protocol.” — official website, 10 November 2026
“Also included: light and dark themes, multiple app languages, a step-by-step guide with answers to frequently asked questions, emoji support, and fully offline autocorrect for English, Russian, German, and Persian,…” — F-Droid, 10 November 2026
“Kryptos — encrypt messages in any messenger” — official website, 10 November 2026
“Version history” — official website, 10 November 2026

At a glance

All of Kryptos is free: no feature is locked behind a paid plan, and its code is open.

Its licence (AGPL-3.0) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

Open source code
No advertising
Commercial use allowed

Sources and checks

Facts collected from Unspecified source (platforms) — 9 November 2026
Facts collected from F-Droid (credit card, source code, publisher, licence, free status, platforms, ads, commercial use, version) — 6 November 2026
Last technical check: 6 November 2026
Description from F-Droid — F-Droid (citation courte)

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