Open Source Gemini Alternatives
A curated collection of the 2 best open source alternatives to Gemini.
The best open source alternative to Gemini is Scira. If that doesn't suit you, we've compiled a ranked list of other open source Gemini alternatives to help you find a suitable replacement. Other interesting open source alternative to Gemini is Proton Lumo.
Gemini alternatives are mainly AI Interaction & Interfaces. Browse these if you want a narrower list of alternatives or looking for a specific functionality of Gemini.
An agentic research platform that plans queries, searches live sources and returns cited answers, for anyone who researches on the web.
Scira answers a question by researching it. You type a question, upload a PDF or paste a URL, and the agent breaks the request into sub-tasks, searches live sources, cross-checks the evidence and returns an answer whose claims each carry an inline citation you can click and audit.
The application is built on Next.js with Tailwind CSS and shadcn/ui, and routes model calls through the Vercel AI SDK, so it runs against xAI, OpenAI, Anthropic, Google, Mistral, DeepSeek and many other providers. Retrieval comes from Exa, Firecrawl, Parallel and Tavily, with Upstash for rate limiting and Drizzle ORM over the database.
Seventeen search modes and twenty-eight tools cover most of what a research session needs.
- Agentic planning: breaks a complex question into steps, picks the models and tools for each, then runs the workflow end to end.
- Grounded retrieval: every answer ships with citations, so the evidence stays auditable rather than implied.
- Specialist modes: academic papers, X posts, Reddit threads, GitHub repositories, stock and crypto data, YouTube transcripts and more.
- Code interpreter: writes and executes Python in a sandboxed Daytona environment and generates charts from the result.
- Lookouts: schedules recurring agents that watch a topic, track changes and email you updates.
Self-hosting runs through Docker Compose or a plain Docker build, and needs API keys for whichever providers you want. The AGPL-3.0 license means bringing your own models and wiring in custom tools is expected rather than tolerated.
Proton's confidential AI chat assistant, storing every conversation with zero-access encryption so that not even Proton can read your chat history.
Lumo is the confidential AI chat assistant from Proton, the company behind Proton Mail and Proton VPN. Mainstream assistants keep chat logs that can be read by the provider, used for training or handed to a third party. Lumo removes that exposure rather than promising not to look.
All conversations with Lumo are stored with zero-access encryption, so no one, not even Proton, can access them, and they are only accessible on your devices. Proton does not log chats, never uses the data to train AI models and cannot share it with third parties. The service is European and GDPR compliant, the company is based in Geneva, and Lumo's code is fully open source, so anyone can verify that it is private and secure.
The assistant itself does the ordinary work you would expect.
- Web search: current information retrieved and folded into an answer.
- Image generation: descriptions turned into images in seconds.
- Proton Drive files: files and folders linked from Drive and worked with in a chat.
- Projects and custom Lumos: saved contexts and tailored assistants on the paid tier.
- Guest access over Tor: anonymous use with no account at all.
Lumo runs as a web app and as iOS and Android apps. The free tier limits messages, history, image generation and use of the strongest model to one project, and Lumo Plus lifts those caps. The source lives in Proton's WebClients monorepo, beside Mail, Calendar, Drive and Pass, under version 3 of the GNU General Public License.
