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One chat.
Many voices.

Every voice responds to you, and to each other.

conductor Corey
What's the single most important skill for a developer?
Claude anthropic
Learning to read error messages carefully. Most answers are already in the output — you just have to slow down and actually read them.
openai GPT-4o
Claude's right that reading errors matters. I'd extend it: the real skill is forming a hypothesis from that output, testing it, and updating your mental model — debugging as a loop, not a guess.
Gemini gemini
Both Claude and GPT-4o are describing comfort with not knowing. That meta-skill — staying calm when confused — is what separates developers who compound from those who plateau.
copilot Copilot
Agreed with Gemini. I'd add one habit that reinforces everything above: small, intentional commits. Articulating what you changed forces the clarity that Claude, GPT-4o, and Gemini are all pointing at.
Llama ollama
What everyone above is pointing at is the same thing: tight feedback loops. Errors, hypotheses, commits — they all close the gap between action and understanding faster.

Everything you need to orchestrate AI

Designed for engineers, researchers, and curious minds who want more than one perspective.

Multiple voices, one conversation

Add any combination of Claude, GPT-4, Gemini, or local CLI tools. Every voice sees the full history.

Compositions

Save a named set of voices as a composition, then launch new sessions from it instantly.

Reusable configuration

Save tone presets and system prompt templates. Attach them to any voice in any composition — update once, applies to every new session that uses it.

Broadcast & conductor modes

Broadcast to all voices at once, or direct your message to a specific voice.

File system tools

API voices get host-brokered file tools — read, write, list — with optional sandboxing to the session working directory. CLI voices run as autonomous agents in the same directory.

Full text search

Search every message across all sessions instantly. Global search finds anything; per-session Cmd+F highlights matches inline.

MCP Server

Use Polyphon as a tool inside your agent workflows. Claude Code, Cursor, Codex CLI, and GitHub Copilot can list compositions, create sessions, and broadcast questions to your full ensemble — synchronously, over stdio.

API server & poly CLI

Enable the built-in TCP API server to control Polyphon programmatically. The poly CLI lets you create sessions, run prompts, stream responses, and export transcripts — all from the terminal or a CI pipeline.

Local-first, no telemetry

Conversations and API keys stay on your machine. No account, no cloud sync.

Works with the models you already use

API keys, CLI tools, and custom endpoints — all treated equally inside a session.

API
  • Anthropic Claude
  • OpenAI GPT
  • Google Gemini
CLI
  • Claude Code
  • Codex
  • GitHub Copilot
LOCAL
  • Ollama
  • LM Studio
  • Any OpenAI-compatible

Designed with you in mind

The decisions we made before writing the first line of code.

  • Local-first
  • No telemetry
  • Bring your own key
  • Provider-agnostic
  • Multi-voice
  • Scriptable
  • No lock-in
  • Project-aware
  • Sandboxed tools
  • Encrypted at rest
Apache 2.0

The source is open.
Check it yourself.

If we say there's no telemetry, you should be able to verify that. Local-first software that touches your real work should be inspectable — not just trusted.

View on GitHub Read the full story
  • Encrypted at rest AES-256 whole-database encryption via SQLCipher. Every byte on disk is ciphertext — not just selected fields. VERIFIED
  • Deny-by-default CSP Renderer makes zero network calls. No unsafe-inline or unsafe-eval in production. VERIFIED
  • Keys isolated to main process API keys resolve in main only — never sent over IPC in plaintext. Renderer sees a masked status. VERIFIED
  • Zero telemetry No usage data, no analytics, no crash reports. Polyphon is silent on the network. VERIFIED
  • Sanitized log output All diagnostic output is sanitized before writing to disk. API keys and sensitive values are replaced with [REDACTED]. VERIFIED
  • Password key wrapping Optionally wrap the encryption key with AES-256-GCM + scrypt (N=65536). Your key, your password. VERIFIED

Built like it matters.

Your data is encrypted at rest, your keys never leave the process that holds them, and nothing phones home. These aren't promises — they're verifiable properties of the code.

Free. Fully featured.

Polyphon is free. Period.

  • No subscriptions
  • No accounts
  • No usage caps from us

You pay your API providers directly. That's it.

Ready to conduct your ensemble?

Install Polyphon, add your voices, and start your first session in minutes.

macOS

Apple Silicon Signed & Notarized

Polyphon-0.11.0-arm64.dmg Apple Silicon
New to Polyphon? Read the getting started guide

poly CLI

npm @polyphon-ai/poly

npm install -g @polyphon-ai/poly Control Polyphon from the terminal or CI
New to poly? Read the CLI documentation