Stars
Forks
Last commit
Stars
Forks
Last commit
Stars
Forks
Last commit
Stars
Forks
Last commit
Stars
Forks
Last commit
Stars
Forks
Last commit
The best open source alternative to Letta is Mem0. If that doesn't suit you, we've compiled a ranked list of other open source Letta alternatives to help you find a suitable replacement. Other interesting open source alternative to Letta is Supermemory.
Letta alternatives are mainly AI Memory & Context Tools. Browse these if you want a narrower list of alternatives or looking for a specific functionality of Letta.
Adds persistent, searchable memory to AI agents and apps, so they remember user preferences and past interactions across sessions without pipeline changes.

Mem0 is a memory infrastructure layer built for AI agents and applications that need to retain context across sessions. Without something like this, every conversation starts from scratch, forcing developers to stuff redundant history into prompts or lose personalization entirely. Mem0 solves that by extracting, storing, and retrieving memories automatically as users interact.
The core idea is simple: you send messages to Mem0, it learns from them, and later retrieves the relevant context when needed. No boilerplate configuration required. It fits into existing agent architectures without restructuring your pipeline.
Key capabilities include:
Mem0 is particularly well-suited for products where personalization compounds over time: healthcare assistants that track patient history, customer support bots that remember past issues, or AI chat interfaces that need to feel consistent across sessions. It also works well as the memory backend for more complex agent frameworks that handle multi-step reasoning but lack native persistence.
Over 90,000 developers use it in production. The SDK supports Python and Node.js, and the managed API makes it easy to get started without self-hosting. For teams that need full control, self-hosted deployment is available with the same API surface.
Add persistent memory to LLM apps with millisecond recall times. Store, retrieve, and personalize user data across sessions with enterprise-grade security.

Transform your AI applications with blazing-fast long-term memory that delivers sub-300ms recall times. Supermemory provides a universal memory API that works seamlessly across all LLM models and modalities.
Key benefits include:
The platform handles multimodal data ingestion from files, documents, chats, emails, and app streams with automatic cleaning and chunking. Advanced embeddings and graph-based enrichment create smart, interconnected memories that scale effortlessly.
Integration is simple - drop Supermemory into your existing stack with SDKs for OpenAI, Anthropic, AI SDK, and Cloudflare. Connect to popular platforms like Google Drive, Notion, and OneDrive to sync user context automatically.
Perfect for developers building personalized AI experiences, search engines, content libraries, and knowledge management systems. Start free with 1M tokens processed and 10K search queries, then scale as your memory becomes your competitive advantage.
The leading AI Code Review platform. Ship better quality code in 50% less time, with 90% fewer bugs.
Try it for free