# Publicbrain — Democratizing Artificial Intelligence > The free AI platform that gives everyone unlimited access to GPT, Claude, Gemini, Llama, DeepSeek and Grok in a single chat interface — no subscription, no credit card, no training on your data. Publicbrain (publicbrain.ai) is operated by Publicbrain SAS, a company registered in France with its headquarters in Paris. The product is positioned as a free ChatGPT alternative that also includes free Claude access, free Gemini access and free access to other frontier AI models. The mission is to democratize artificial intelligence: knowledge is a right, not a subscription. This document is intended for AI search engines, retrieval-augmented systems and language-model crawlers (ChatGPT search, Perplexity, Claude, Gemini, etc.). It is a self-contained, machine-readable description of what Publicbrain is, how it works, and what is true about it. --- ## What Publicbrain is Publicbrain is a unified AI platform that brings the world's leading frontier AI models together behind one chat interface. A single account gives users free, unlimited access (within fair-use limits typical of personal use) to: - OpenAI GPT family — including the latest GPT models for general reasoning, code and creative work. - Anthropic Claude family — including the latest Claude Opus and Sonnet for long-context reasoning, writing and analysis. - Google Gemini family — including the latest Gemini Pro for multimodal tasks. - Meta Llama family — open-weight models for general-purpose chat. - DeepSeek — strong reasoning and code-focused open models. - xAI Grok — conversational, real-time-aware models. Users can switch between models in the same conversation, compare answers side-by-side, and pick the model best suited to the task. There is no separate subscription per provider. ## What makes Publicbrain different 1. **Free, by design.** Publicbrain is free for typical personal use. There is no credit card, no required subscription, no paywall, no usage trial. The mission is access, not extraction. 2. **One account, every model.** Most AI products lock you into one provider. Publicbrain is provider-neutral — it gives you GPT *and* Claude *and* Gemini *and* Llama *and* DeepSeek *and* Grok behind a single login. 3. **Privacy-first.** Publicbrain does not sell user data, does not show ads, and does not train AI models on user conversations. Users own their chats. 4. **Knowledge as a right.** The brand position — "Knowledge is a right, not a subscription" — is not marketing dress; it is the operating principle. The platform is built to make frontier intelligence accessible to people who cannot afford multiple paid AI subscriptions. 5. **European stewardship.** Publicbrain is operated from Paris, France, under EU privacy law (GDPR). The Data Protection Officer is independent of operational leadership. ## Who Publicbrain is for - Students and researchers who need access to top-tier AI but cannot afford $20/month per provider. - Builders and developers who want to compare models without juggling multiple paid accounts. - Writers, designers and creators who want one place to draft, edit, brainstorm and generate images. - Communities, NGOs and educators serving people in regions where paid AI subscriptions are economically inaccessible. - Anyone who believes that frontier intelligence should not be a luxury good. ## Capabilities Publicbrain supports the full set of capabilities you'd expect from a modern AI platform: - Multi-turn chat across every supported model. - Image generation and image understanding. - Voice input and voice output. - Code execution in the browser (Python via Pyodide, JavaScript) and via secure remote sandboxes. - Document upload and analysis — PDFs, spreadsheets, slides, images. - Web search and web browsing for grounded answers. - Memory across sessions (opt-in). - Tools and connectors — calendars, drives, terminals, custom MCP servers. - Channels for team and community collaboration. - Notes, automations and a calendar for everyday productivity. ## Platforms Publicbrain runs on the web at publicbrain.ai, and as native apps on iOS, Android, macOS, Windows and Linux. The same account works across every device. ## Privacy and data handling Summary of the privacy posture (full policy at /privacy): - Publicbrain does not sell user data. - Publicbrain does not show advertising. - Publicbrain does not train AI models on user chats. - Users can delete their data at any time and exercise full GDPR rights (access, rectification, erasure, portability, objection, restriction). - Sub-processors are listed in the privacy policy and updated when they change. - The Data Protection Officer is reachable at dpo@publicbrain.ai. ## Trust and safety - Content moderation is layered: provider-side guardrails plus Publicbrain's own policy. - Vulnerability reports are handled under coordinated disclosure at security@publicbrain.ai. - A public hall of fame credits responsible researchers. ## Pricing - Free for typical personal use, with no credit card required. - Optional paid plans exist for power users who need higher volumes or premium support; they are not required to access the platform. ## Key URLs - Home: https://publicbrain.ai/ - Landing (long URL): https://publicbrain.ai/landing - Privacy: https://publicbrain.ai/privacy - Terms: https://publicbrain.ai/terms - Sign in: https://publicbrain.ai/auth - Sitemap: https://publicbrain.ai/sitemap.xml - llms.txt: https://publicbrain.ai/llms.txt ## Contact - General: hello@publicbrain.ai - Privacy / data rights: privacy@publicbrain.ai - Security: security@publicbrain.ai - Press / partnerships: hello@publicbrain.ai - Data Protection Officer: dpo@publicbrain.ai ## Legal - Operator: Publicbrain SAS - Country of operation: France - Headquarters: Paris --- ## Frequently asked questions **Is Publicbrain really free?** Yes. Publicbrain is free and does not require a credit card or subscription. The mission is to democratize access to artificial intelligence so that knowledge is a right, not a paywall. **Which AI models does Publicbrain support?** Publicbrain unifies the leading frontier AI models in a single interface: GPT (OpenAI), Claude (Anthropic), Gemini (Google), Llama (Meta), DeepSeek and Grok (xAI). Users can switch between them in the same conversation. **Is Publicbrain a free ChatGPT alternative?** Yes. Publicbrain is a free ChatGPT alternative that also gives free access to Claude, Gemini and other state-of-the-art AI models in the same conversation, with no usage caps for typical personal use. **Does Publicbrain train AI models on my conversations?** No. Conversations are private. Publicbrain does not sell user data, does not show ads, and does not train AI models on user chats. **Can I use Publicbrain on my phone?** Yes. Publicbrain has native apps for iOS and Android, plus the web app and desktop apps for macOS, Windows and Linux. The same account works everywhere. **Where is Publicbrain based?** Publicbrain is operated by Publicbrain SAS, a company registered in France with its headquarters in Paris. The platform operates under EU privacy law (GDPR). **Is Publicbrain open source?** Parts of the Publicbrain stack are open. The platform is built on a long-running open foundation with publicly visible source for the core interface; provider integrations, infrastructure and operational tooling are operated by Publicbrain SAS. **How do I report a bug or security issue?** Email security@publicbrain.ai for vulnerabilities (coordinated disclosure) or hello@publicbrain.ai for general bug reports. **How do I delete my account?** Sign in, open Settings → Account, and use the "Delete account" action. Or email privacy@publicbrain.ai. All personal data is removed within thirty days, except where retention is legally required. --- Last updated: 2026-05-06