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Lark alternatives · Team Chat

Open-source alternatives to Lark

Lark is not described as open source on its own site. 22 of the 75 other team communication apps in this directory are open source, according to their own sites.

Lark has a free plan. Paid plans start at $6 per user / month, billed annually. All of them are free or have a free plan.

22 tools · Listings checked up to Nov 13, 2026 · Where the facts come from

The 12 closest to Lark

  1. Mattermost

    Self-hosted team messaging with playbooks, calls and boards

    • Mattermost is open source and self-hostable, according to its own site.
    • Mattermost also covers kanban boards and AI agents.
    • Lark also covers transcription, wiki, calendar, documents and video calls.
    Mattermost pricing and details

  2. Element

    End-to-end encrypted chat and calls on the Matrix standard

    • Element is open source, self-hostable and end-to-end encrypted, according to its own site.
    • Element also covers file sharing.
    • Lark also covers transcription, wiki, calendar, workflow automation and documents.
    Element pricing and details

  3. Wire

    End-to-end encrypted messaging and calls for organizations

    • Wire starts at €7.45 per person / month, paid annually. Lark starts at $6 per user / month, billed annually.
    • Wire is open source, self-hostable and end-to-end encrypted, according to its own site.
    • Wire also covers file sharing.
    • Lark also covers transcription, wiki, calendar, workflow automation and documents.
    Wire pricing and details

  4. Twake

    Open-source workplace suite with chat, mail and drive

    • Twake starts at €4.00 per month. Lark starts at $6 per user / month, billed annually.
    • Only Lark lists a web app.
    • Twake is open source and self-hostable, according to its own site.
    • Twake also covers file sharing.
    Twake pricing and details

  5. Jami

    Peer-to-peer encrypted chat, calls and video conferences

    • Jami is free. Lark starts at $6 per user / month, billed annually.
    • Only Lark lists a web app.
    • Jami is open source and end-to-end encrypted, according to its own site.
    • Jami also covers file sharing.
    Jami pricing and details

  6. SimpleX Chat

    Private messenger that uses no user identifiers at all

    • SimpleX Chat is free. Lark starts at $6 per user / month, billed annually.
    • Only Lark lists a web app.
    • SimpleX Chat is open source and end-to-end encrypted, according to its own site.
    • Lark also covers transcription, wiki, calendar, workflow automation and documents.
    SimpleX Chat pricing and details

  7. Olvid

    End-to-end encrypted messenger needing no phone number

    • Olvid starts at €4.99 per user / month, incl. taxes (in-app purchase). Lark starts at $6 per user / month, billed annually.
    • Only Lark lists a Linux app.
    • Olvid is open source and end-to-end encrypted, according to its own site.
    • Olvid also covers chatbots.
    Olvid pricing and details

  8. OpenIM

    Open-source chat, voice and video infrastructure for apps

    • Only Lark lists macOS, Windows and Linux apps.
    • OpenIM is open source and self-hostable, according to its own site.
    • Lark also covers transcription, wiki, calendar, workflow automation and documents.
    OpenIM pricing and details

  9. Rocket.Chat

    Open-source, self-managed chat for security-focused teams

    • Rocket.Chat is open source, self-hostable and end-to-end encrypted, according to its own site.
    • Rocket.Chat also covers file sharing.
    • Lark also covers transcription, wiki, calendar, workflow automation, documents and video calls.
    Rocket.Chat pricing and details

  10. Zulip

    Open-source team chat that organizes channels by topic

    • Zulip starts at $3.50 per user / month self-hosted (billed monthly); Cloud from $6.67 billed annually. Lark starts at $6 per user / month, billed annually.
    • Zulip is open source and self-hostable, according to its own site.
    • Zulip also covers file sharing.
    • Lark also covers transcription, wiki, calendar, workflow automation, documents and video calls.
    Zulip pricing and details

  11. Jitsi Meet

    Free, open-source video meetings you can self-host

    • Jitsi Meet is free. Lark starts at $6 per user / month, billed annually.
    • Jitsi Meet is open source, self-hostable and end-to-end encrypted, according to its own site.
    • Lark also covers transcription, wiki, calendar, workflow automation, documents and team chat.
    Jitsi Meet pricing and details

  12. ONCE Campfire

    Self-hosted group chat from 37signals, free and open source

    • ONCE Campfire is free. Lark starts at $6 per user / month, billed annually.
    • Only Lark lists macOS, Windows, Linux, iOS and Android apps.
    • ONCE Campfire is open source and self-hostable, according to its own site.
    • ONCE Campfire also covers file sharing.
    ONCE Campfire pricing and details

10 more that are open source

All 22 in one table

Common questions

Is there an open-source alternative to Lark?

Yes. Mattermost, Element, Wire, Twake, Jami, SimpleX Chat, Olvid, OpenIM and 14 more are open source, according to their own sites.

Is Lark open source?

Lark is not described as open source on its own site. The listing was checked on Oct 9, 2026 against the pages it cites.

When was this checked?

Each listing shows its own date. On this page they run from Oct 5, 2026 to Nov 13, 2026. Vendors change prices and plans without notice, so confirm on their site before you buy.

This page is built from the listings. A tool is here because its listing says so, and the order is how close each is to Lark: the alternatives its listing names first, then the tools that share the most features with it.