Mastra Code vs. zerostack

Feature	Mastra Code	zerostack

Tagline	Coding agent that replaces compaction with Observational Memory	Minimal Rust coding agent optimized for memory footprint
Website	https://code.mastra.ai/	https://gi-dellav.github.io/zerostack/
Language	typescript	rust
Release Date	December 24, 2025	May 12, 2026
Last Updated	September 4, 2026	September 4, 2026
Provider Type	Independent	Independent
MCP Support	Yes	Yes
Multi-Agent Support	Yes	Yes
Git Integration	basic	deep
Multi-File Editing	Yes	Yes
Auto Test Running	No	Yes
Sandbox / Permissions	Yes	Yes
Image / Multimodal Input	Yes	Yes
Voice Mode	Yes	No
IDE Integration	ACP (Agent Client Protocol)	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; observation-based	Model-dependent; auto-compaction
Supported Models	Claude, GPT, Gemini and thousands more via Mastra's unified model router, plus custom OpenAI-compatible providers	OpenRouter (default), OpenAI, Anthropic, Gemini, Ollama, plus unlimited custom OpenAI-compatible endpoints (vLLM, LiteLLM, enterprise gateways)
Supported Subscriptions	Claude Code ChatGPT GitHub Copilot SuperGrok	—
Pricing Model	Free, BYOK	Free, BYOK
Free Tier	Yes	Yes
Price Range	Free (BYOK)	Free (BYOK)
Source Code Availability	Open Source (Apache-2.0)	Open Source (GPL-3.0)
Source Code	https://github.com/mastra-ai/mastra	https://github.com/gi-dellav/zerostack
Development State	active	active