Which is more popular, Haystack or Mastra?

Mastra has more GitHub stars (28,525 vs 26,646).

Which is more actively developed, Haystack or Mastra?

Mastra had more commits in the last 90 days (4,109 vs 768).

Compare their capabilities, limitations and "best for" notes above. Trying each on a small task is the fastest way to decide.

Side-by-side comparison of two AI agent tools

Mastra is growing faster: +968 GitHub stars in the last 30 days vs +318 for Haystack.
Pick Haystack for: open-source AI orchestration framework for modular RAG pipelines and agent workflows. Pick Mastra for: from the team behind Gatsby, Mastra is a framework for building AI-powered applications and agents.

From GitHub data refreshed daily.

Haystackopen-source

Open-source AI orchestration framework for modular RAG pipelines and agent workflows

From the team behind Gatsby, Mastra is a framework for building AI-powered applications and agents with a modern TypeScript stack.

+Production-ready architecture with robust testing and type safety (Mypy, comprehensive test coverage)
+Modular pipeline design allows for flexible composition and customization of AI workflows
+Strong community adoption with 24,000+ GitHub stars and active development by deepset

•Building production RAG systems with sophisticated document retrieval and context management
•Creating AI agent workflows with explicit control over routing and decision-making processes
•Developing modular AI pipelines that require custom retrieval and context engineering components

Which is more popular, Haystack or Mastra?: Mastra has more GitHub stars (28,525 vs 26,646).
Which is more actively developed, Haystack or Mastra?: Mastra had more commits in the last 90 days (4,109 vs 768).
Should I use Haystack or Mastra?: Compare their capabilities, limitations and "best for" notes above. Trying each on a small task is the fastest way to decide.