Kontalk review
A free, open-source XMPP messenger with phone-number identity, now discontinued.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Kontalk is a free, open-source messaging network for people who want encrypted communication built around phone-number identification. It supports end-to-end encrypted messaging through an XMPP-based network, with an Android client and desktop client listed. Its community-operated structure and open client and server software make it a fit for users who value inspectable software and a distributed service model over a broad consumer feature set.
The product’s strongest technical identity comes from its combination of default encryption, XMPP, and phone-number-based user identification. XMPP gives Kontalk a standards-based messaging foundation, while the community-operated network distinguishes it from services centered on a single commercial operator. The open-source model also covers both client and server software, which matters to users evaluating how the service is built and operated. This focused design suits straightforward text messaging across supported clients rather than a wide communications suite.
The decisive consideration is service status: Kontalk entered an end-of-life period, and the service was expected to shut down before the end of 2024. It is therefore a discontinued product rather than a current choice for dependable messaging. Users researching open-source XMPP software may still find its architecture relevant, but anyone choosing a service for ongoing communication should select an active alternative instead. Kontalk fits historical or project-focused evaluation better than present-day deployment, especially for buyers who need continued availability, a larger feature range, or a currently maintained messaging platform.
Kontalk pros and cons
- Where it wins
- End-to-end encrypted messaging is enabled by default
- Open-source client and server software
- Community-operated, distributed XMPP network
- Where it doesn't
- Kontalk is discontinued
- The published platform support centers on Android and desktop
- Its verified feature set is narrower than broader messaging apps
Kontalk fact sheet, pricing and score →
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