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ChatGPT alternatives · AI Assistants

Open-source alternatives to ChatGPT

ChatGPT is not described as open source on its own site. 13 of the 57 other AI assistants in this directory are open source, according to their own sites.

ChatGPT has a free plan. Paid plans start at $8 per month (Go). All of them are free or have a free plan.

13 tools · Listings checked up to Oct 9, 2026 · Where the facts come from

The 12 closest to ChatGPT

  1. DeepSeek

    Free AI chat assistant built on DeepSeek's openly released models

    • DeepSeek is free. ChatGPT starts at $8 per month (Go).
    • Only ChatGPT lists a Linux app.
    • DeepSeek is open source, according to its own site.
    • DeepSeek also covers AI agents.
    DeepSeek vs ChatGPTDeepSeek pricing and details

  2. Jan

    Open-source desktop app for running local and cloud AI models

    • Jan is free. ChatGPT starts at $8 per month (Go).
    • Only ChatGPT lists a web app.
    • Only ChatGPT lists iOS and Android apps.
    • Jan is open source, according to its own site.
    Jan pricing and details

  3. Maple AI

    End-to-end encrypted AI chat that runs open models in enclaves

    • Maple AI starts at $20 per month (Pro). ChatGPT starts at $8 per month (Go).
    • Maple AI is open source and end-to-end encrypted, according to its own site.
    Maple AI pricing and details

  4. Lumo

    Proton's private AI assistant with zero-access encrypted chats

    • Lumo starts at $9.99 per month, billed yearly ($119.88), or $12.99 billed monthly. ChatGPT starts at $8 per month (Go).
    • Only ChatGPT lists macOS, Windows and Linux apps.
    • Lumo is open source, according to its own site.
    Lumo pricing and details

  5. HuggingChat

    Hugging Face's open-source chat app for open AI models

    • HuggingChat starts at $9 per month (Hugging Face PRO). ChatGPT starts at $8 per month (Go).
    • Only ChatGPT lists macOS, Windows, Linux, iOS and Android apps.
    • HuggingChat is open source and self-hostable, according to its own site.
    • HuggingChat also covers AI agents.
    HuggingChat pricing and details

  6. LibreChat

    Open-source, self-hosted chat interface for many AI providers

    • LibreChat is free. ChatGPT starts at $8 per month (Go).
    • Only ChatGPT lists macOS, Windows, Linux, iOS and Android apps.
    • LibreChat is open source and self-hostable, according to its own site.
    • LibreChat also covers AI agents.
    LibreChat pricing and details

  7. Chatbox

    AI chat client for your own API keys or a hosted model plan

    • Chatbox starts at $3.50 per month, billed annually ($3.99 billed monthly). ChatGPT starts at $8 per month (Go).
    • Chatbox is open source, according to its own site.
    • Chatbox also covers AI agents.
    Chatbox pricing and details

  8. PyGPT

    Open-source desktop AI assistant with agents, RAG and local models

    • PyGPT is free. ChatGPT starts at $8 per month (Go).
    • Only ChatGPT lists a web app.
    • Only ChatGPT lists iOS and Android apps.
    • PyGPT is open source, according to its own site.
    PyGPT pricing and details

  9. AnythingLLM

    Open-source AI app for documents, agents and local models

    • AnythingLLM starts at $50 per month (Basic hosted cloud instance). ChatGPT starts at $8 per month (Go).
    • Only ChatGPT lists an iOS app.
    • AnythingLLM is open source and self-hostable, according to its own site.
    • AnythingLLM also covers meeting notes and AI agents.
    AnythingLLM pricing and details

  10. Cherry Studio

    Open-source desktop AI client for 50+ model providers

    • Only ChatGPT lists a web app.
    • Cherry Studio is open source, according to its own site.
    • Cherry Studio also covers AI agents.
    • ChatGPT also covers AI search.
    Cherry Studio pricing and details

  11. Big-AGI

    Multi-model AI workspace that compares and merges answers

    • Big-AGI starts at $9 per month, billed yearly ($108), or $10.99 billed monthly (Pro). ChatGPT starts at $8 per month (Go).
    • Only ChatGPT lists macOS, Windows, Linux, iOS and Android apps.
    • Big-AGI is open source and self-hostable, according to its own site.
    • ChatGPT also covers AI search.
    Big-AGI pricing and details

  12. NextChat

    Lightweight open-source AI chat client you can self-deploy

    • Only ChatGPT lists an Android app.
    • NextChat is open source and self-hostable, according to its own site.
    • ChatGPT also covers AI search.
    NextChat pricing and details

1 more that are open source

All 13 in one table

Common questions

Is there an open-source alternative to ChatGPT?

Yes. DeepSeek, Jan, Maple AI, Lumo, HuggingChat, LibreChat, Chatbox, PyGPT and 5 more are open source, according to their own sites.

Is ChatGPT open source?

ChatGPT 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 Oct 9, 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 ChatGPT: the alternatives its listing names first, then the tools that share the most features with it.