Pi vs. zerostack

Feature	Pi	zerostack

Tagline	A minimal terminal coding harness	Minimal Rust coding agent optimized for memory footprint
Website	https://pi.dev	https://gi-dellav.github.io/zerostack/
Language	typescript	rust
Release Date	December 2, 2025	May 12, 2026
Last Updated	August 19, 2026	September 4, 2026
Provider Type	Independent	Independent
MCP Support	No	Yes
Multi-Agent Support	Yes	Yes
Git Integration	deep	deep
Multi-File Editing	Yes	Yes
Auto Test Running	Yes	Yes
Sandbox / Permissions	Yes	Yes
Image / Multimodal Input	Yes	Yes
Voice Mode	No	No
IDE Integration	None - Terminal only	Zed (via ACP), Neovim (via CodeCompanion.nvim + ACP)
Hooks / Extensions	Yes	Yes
Web Search	Yes	Yes
Local Model Support	Yes	Yes
Context Window	Model-dependent; auto-compaction	Model-dependent; auto-compaction
Supported Models	20+ providers: Anthropic, OpenAI, Google, Mistral, OpenRouter, Groq, Ollama, xAI, Azure, Bedrock	OpenRouter (default), OpenAI, Anthropic, Gemini, Ollama, plus unlimited custom OpenAI-compatible endpoints (vLLM, LiteLLM, enterprise gateways)
Supported Subscriptions	GitHub Copilot Claude Code ChatGPT	—
Pricing Model	BYOK	Free, BYOK
Free Tier	Yes	Yes
Price Range	Free (BYOK)	Free (BYOK)
Source Code Availability	Open Source (MIT)	Open Source (GPL-3.0)
Source Code	https://github.com/badlogic/pi-mono	https://github.com/gi-dellav/zerostack
Development State	active	active