Alternatives

Best Letta alternatives

10 tools similar to Letta, ranked by how closely they match what it does among agent frameworks. All 10 have a free option.

Letta alternatives at a glance

Tool	Pricing	Free option	API	Open source	Compare
Letta(this tool)	Freemium
AutoGen	Free				vs Letta
Pydantic AI	Free				vs Letta
Haystack	Freemium				vs Letta
CrewAI	Freemium
Flowise	Freemium
Stack AI	Enterprise
Dify	Freemium
Agno	Freemium
AnythingLLM	Freemium
AgentGPT	Freemium · from $20/mo

Top 10 alternatives to Letta

AutoGen

Agent frameworks

Build multi-agent AI applications with conversable, customizable agents powered by LLMs

FreeDevAPIOSSSelf-host

OpenAI, Azure OpenAI, and others

Pydantic AI

Agent frameworks

GenAI Agent Framework, the Pydantic way — build production-grade AI apps with confidence

OpenAIAnthropicGoogleCohere+4

FreeDevAPIOSSSelf-host

Model-agnostic (OpenAI, Anthropic, Gemini, Mistral, Cohere, Groq, Ollama, and more)Growing

Haystack

Agent frameworks

The open-source AI framework for production-ready agents, RAG & context engineering

Open source · Enterprise support available

OpenAIAnthropicMistralHugging Face+3

Free tierDevAPIOSSSelf-host

Agnostic (OpenAI, Anthropic, Mistral, Hugging Face, and more)Popular

CrewAI

Agent frameworks

The open platform that accelerates enterprise agent adoption at scale

Freemium model with enterprise pricing available

ArizeGalileoDataDogPatronus

Free tierEveryoneAPIOSSSelf-host

Multi-LLM (model-agnostic)10M+ users

Flowise

Agent frameworks

Open source visual platform for building AI agents and LLM-powered applications

Free · $35/mo Starter · $65/mo Pro

LangChainSlackNotionOpenTelemetry+1

Free tierEveryoneAPIOSSSelf-host

Agnostic (100+ LLMs supported)12kPopular

Stack AI

Agent frameworks

Orchestrate enterprise AI agents with security, governance, and 100+ integrations — in minutes.

Free trial available · Enterprise plans via demo/contact

AsanaAnthropicSalesforceMicrosoft 365+1

EnterpriseEveryoneAPISelf-host

LLM Agnostic (Anthropic, OpenAI, and others)Growing

Dify

Agent frameworks

Build, deploy, and manage autonomous AI agents and RAG pipelines — effortlessly at any scale.

Free tierEveryoneAPIOSSSelf-host

Multi-model (OpenAI, Anthropic, open-source, and more)Popular

Agno

Agent frameworks

Open-source agent framework and high-performance runtime for building multi-agent systems at scale

Free tier available · AgentOS for production deployment

LangGraphLangChainClaudeSlack+1

Free tierDevAPIOSSSelf-host

Multi-provider (30+ model providers)Growing

AnythingLLM

Chat assistants

The all-in-one AI application — chat with docs, run AI agents, fully private and local

Open source and free to use

Free tierEveryoneAPIOSSSelf-host

Any (local via built-in provider/Ollama, or cloud via OpenAI, Azure OpenAI, AWS Bedrock, and more)Growing

AgentGPT

Automation & agents

Web-based autonomous AI agent that chains GPT tasks together to complete multi-step goals

Free tier appears limited to 5 runs

Free tierEveryoneOSSSelf-host

OpenAI (GPT-3.5)36kGrowing

Free Letta alternatives

Read the full Letta guide Browse all agent frameworks tools