Persistent memory and context infrastructure for AI agents, with an SDK, MCP server and memory router so agents remember users and past work.
Verdict: RetainDB is best for builders adding long-term memory to an agent.
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Persistent memory and context infrastructure for AI agents, with an SDK, MCP server and memory router so agents remember users and past work. Source
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| Free tier | Free forever: 20,000 memory writes and 5,000 context reads per month, 1 project, MCP access. Source |
| Paid plans | Builder $9/month; Pro $29/month; higher tier $99/month. Source |
| Platforms | Cloud API, SDK, MCP server Source |
| Open source | No Source |