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Pi

Free tier

Your personal AI — a kind, supportive conversational companion powered by Inflection AI

Free·Non-technical·Powered by Inflection AI
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Key strengths

Empathetic, emotionally intelligent conversational styleDesigned for open-ended personal dialogue and reflectionAvailable across web, iOS, and Android with voice supportBacked by Inflection AI's proprietary large language modelsPersistent memory for continuity across conversations
Completely free
Palo Alto, USA
Founded 2022
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Technical Notes for Developers

⚠️ No public API is currently available. Pi is a consumer product and Inflection AI has not released a developer API for Pi at this time.

Architecture & Infrastructure

  • Model: Inflection-2.5, a proprietary LLM trained by Inflection AI with an emphasis on conversational safety, empathy, and coherence.
  • Deployment: Fully managed SaaS — no self-hosting option exists.
  • Access: Web (HTTPS), iOS (App Store), Android (Google Play).
  • Real-time streaming: Responses are streamed token-by-token for low-latency UX.

Authentication

  • Phone number or email-based sign-up; no OAuth or SSO integrations documented publicly.

Integration Options

  • No webhooks, SDKs, or third-party integrations are currently offered.
  • For enterprise or API inquiries, contact Inflection AI directly at inflection.ai.