Keywords AI

Mastra vs Semantic Kernel

Compare Mastra and Semantic Kernel side by side. Both are tools in the Agent Frameworks category.

Quick Comparison

	Mastra	Semantic Kernel
Category	Agent Frameworks	Agent Frameworks
Pricing	Open Source	Open Source
Best For	TypeScript developers who want a modern framework for building production AI agents	Enterprise .NET developers building AI applications on Microsoft infrastructure
Website	mastra.ai	learn.microsoft.com
Key Features	TypeScript agent framework Built-in tool calling and workflows Sync engine for agent state Integration marketplace Production-ready agent primitives	Enterprise AI orchestration by Microsoft C# and Python SDKs Plugin architecture for tools Memory and planning capabilities Azure and Microsoft 365 integration
Use Cases	TypeScript-native agent development Building AI workflows with tool use Agent state management Production agent deployment Multi-step task automation	Enterprise AI on Microsoft stack Copilot-style applications Integrating AI into .NET applications Microsoft 365 automation Enterprise workflow orchestration

When to Choose Mastra vs Semantic Kernel

Choose Mastra if you need

TypeScript-native agent development
Building AI workflows with tool use
Agent state management

Pricing: Open Source

Choose Semantic Kernel if you need

Enterprise AI on Microsoft stack
Copilot-style applications
Integrating AI into .NET applications

Pricing: Open Source

How to Choose a Agent Frameworks Tool

Key criteria to evaluate when comparing Agent Frameworks solutions:

Programming languagePython, TypeScript, or both — must match your team skills and existing codebase.

Architecture patternSingle-agent, multi-agent, or graph-based orchestration depending on task complexity.

Tool ecosystemBuilt-in tools and ease of creating custom tools for your specific needs.

ObservabilityBuilt-in tracing, debugging, and monitoring for understanding agent behavior.

Production readinessError handling, retries, streaming, and deployment options for production use.

About Mastra

Mastra is a TypeScript-first agent framework for building production AI applications. It provides primitives for agents, workflows, RAG, integrations, and memory with a focus on developer experience and type safety. Mastra is designed for full-stack TypeScript developers who want to build AI features without leaving their existing tech stack.

View Mastra profile →Visit website

About Semantic Kernel

Semantic Kernel is Microsoft's enterprise SDK for integrating AI into applications. It provides planners for multi-step task execution, plugin architectures for tool use, memory systems, and connectors for all major LLM providers. Available in C#, Python, and Java, Semantic Kernel is designed for enterprise .NET shops building AI-powered features into existing applications.

View Semantic Kernel profile →Visit website

What is Agent Frameworks?

Developer frameworks and SDKs for building autonomous AI agents with tool use, planning, multi-step reasoning, and orchestration capabilities.

Browse all Agent Frameworks tools →

Frequently Asked Questions

What is an AI agent framework?▾

An agent framework provides the building blocks for creating AI agents that can autonomously plan, use tools, and complete multi-step tasks. Instead of building tool use, memory, and orchestration from scratch, you get pre-built components that handle the common patterns.

Do I need a framework or can I build agents with raw API calls?▾

For simple single-tool agents, raw API calls work fine. Frameworks become valuable when you need multi-step planning, tool orchestration, error recovery, memory, or multi-agent coordination. They save significant development time for complex agent architectures.

Which agent framework should I choose?▾

LangChain and LlamaIndex are the most mature with the largest ecosystems. CrewAI is best for multi-agent workflows. Vercel AI SDK is ideal for TypeScript/Next.js applications. Evaluate based on your language preference, use case complexity, and integration needs.