Letta Alternatives
2 alternatives to Letta — free and paid AI coding tools covering similar jobs, with pricing and standout strengths.
Full comparison: Mem0 vs Zep vs Letta: Agent Memory Compared (2026)
Looking for a Letta alternative? Letta is listed under Platform (freemium). The 2 tools below cover similar jobs, closest matches first — the table compares pricing, license, and platforms so you can shortlist quickly, and each entry further down adds a fuller summary and a link to the full profile.
Free and open-source alternatives to Letta
Letta alternatives in detail
Zep
freemiumApache-2.0WebPlatformZep builds agent memory as temporal knowledge graphs: facts carry validity intervals, so the system tracks when things changed, not just what's true. Zep Cloud claims sub-200ms retrieval at 100M-node scale; Graphiti (~27k stars, Apache-2.0) is the open-source graph engine underneath — hybrid semantic+BM25+traversal retrieval with real-time incremental updates.
Mem0
open sourceApache-2.0SDKMem0 adds a persistent memory layer to agents and LLM apps: it extracts, stores, and retrieves salient facts across sessions so an assistant remembers a user's preferences and history instead of starting cold each conversation. Open-source library plus a managed platform.