Alternatives to Genkit

Open-source TypeScript toolkit for building AI apps and agents across 100+ models with streaming, tools, and fallbacks

Eino is an open-source Go framework from ByteDance for building LLM apps, agents, and graphs in your existing Go backend.

Open-source (MIT) MCP testing and full-stack MCP App framework for building ChatGPT Apps and Claude Connectors from one React codebase.

Open source Python and TypeScript SDKs for building production AI agent harnesses you control end to end.

Marvin is an open-source Python framework that turns ordinary functions into AI-powered tools using decorators like @ai_fn and @ai_classifier.

Open Harness is an open-source TypeScript SDK for building Claude Code-style agent harnesses with stateless primitives and composable middleware.

Mirascope is an open-source Python library that turns LLM calls, tools, and prompt versioning into plain decorated functions.

CopilotKit is the open-source React framework for adding agent chat, generative UI, and shared state to any AG-UI backend.

Open-source Python library that constrains LLM decoding with finite-state machines so Pydantic, JSON Schema, regex, and grammar outputs come out valid every

Open-source Python library for constraining LLM output with regex, context-free grammars, and inline control flow — archived since October 2023.

OpenUI is an open-source framework that lets AI agents stream interactive UI from your own React, Vue, Svelte or React Native components instead of raw JSON.

Open-source Python library that turns messy text into typed, queryable Semantic DataFrames built on Polars

Open-source Python framework for building inspectable RAG pipelines and production agents, installable via pip.

Open-source LLM from UC Berkeley that turns natural language into API calls and tool-using agent actions.

Rig is a free, MIT-licensed Rust library for building LLM apps and agents behind one unified API across 20+ model providers.

Open-source Python package for building conversational AI apps with a production-ready chat UI, auth, and persistence.

Open-source Go SDK giving one unified API across 25+ LLM providers with streaming, typed structured output, and MCP support.

Open-source Java library that puts a unified LLM and vector store API inside your JVM app

MIT-licensed open-source Swift package for calling the OpenAI API with async/await and Combine from Apple platforms.

Open-source React toolkit for generative UI — let an agent render your own components from natural language

Open-source Django library for adding LLM assistants, chat, and RAG inside your existing Django app

tokf is an open-source Rust CLI that filters noisy terminal command output before your AI coding assistant reads it.

BAML is a type-safe programming language for building AI agents and structured LLM output that compiles instead of guessing.

Pydantic AI is a typed Python agent SDK: define a model string and an output type, get validated structured results every run.

OpenAI Cookbook is a free, MIT-licensed GitHub repository of example code and guides for working with the OpenAI API.

A Rust library for building fast, streaming LLM pipelines — indexing, retrieval, and autonomous agents.

Mellea turns type-annotated Python functions into validated, testable LLM calls with token-level constrained decoding.

Kiln is a local-first AI workbench for building, evaluating, and optimizing AI systems on your own machine.

Free browser markdown editor with Battle Mode for comparing OpenAI, Claude, and Gemini prompt outputs, client-side only.

xsAI is an extra-small OpenAI-compatible AI SDK for JavaScript that cuts install size roughly 40x versus the Vercel AI SDK.