OpenBlock vs. zerostack

Feature	OpenBlock	zerostack

Tagline	A self-improving coding agent that handles the full dev lifecycle	Minimal Rust coding agent optimized for memory footprint
Website	https://openblocklabs.com/	https://gi-dellav.github.io/zerostack/
Language	typescript	rust
Release Date	March 16, 2026	May 12, 2026
Last Updated	August 19, 2026	September 4, 2026
Provider Type	Independent	Independent
MCP Support	Yes	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	Model-dependent; auto-compaction
Supported Models	400+ via OpenRouter (Claude, GPT, Gemini, Grok, open-source)	OpenRouter (default), OpenAI, Anthropic, Gemini, Ollama, plus unlimited custom OpenAI-compatible endpoints (vLLM, LiteLLM, enterprise gateways)
Pricing Model	Freemium	Free, BYOK
Free Tier	Yes	Yes
Price Range	$10-100 (credit-based)	Free (BYOK)
Source Code Availability	Proprietary Software	Open Source (GPL-3.0)
Source Code	N/A	https://github.com/gi-dellav/zerostack
Development State	active	active