A agentindex
Comparison

Mastra vs Semantic Kernel

A like-for-like, spec-level comparison. Both entries are verified against their docs and repo.

Mastra

The TypeScript-first agent framework.

  • + Best-in-class DX for TS/JS teams
  • + Includes evals and memory out of the box
  • − Elastic license limits some commercial hosting
  • − Smaller community than Python options

Semantic Kernel

Microsoft's SDK for enterprise AI orchestration.

  • + Strong .NET and Java story for enterprise
  • + Planner abstraction for tool orchestration
  • − Enterprise-flavored, less hacker-friendly
  • − Concept-heavy docs
Spec Mastra Semantic Kernel
Category framework framework
License Elastic-2.0 MIT
Open source Yes Yes
Self-hostable Yes Yes
MCP support Yes Yes
Pricing free free
Starting price BYOK usage cost BYOK usage cost
Models claude, gpt, gemini, byok gpt, claude, byok
Languages typescript csharp, python, java
GitHub stars 25.4k 28.2k
Last activity 2026-06-25 2026-06-25