# LangMem vs past.dev (slim)

> past.dev scores 63.8 (B) to LangMem's 47.9 (D) for agent memory. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/langmem-vs-past-dev.md (~2,550 tokens) · this version ~680 tokens · JSON https://www.anchorterminal.com/compare/langmem-vs-past-dev.json · canonical https://www.anchorterminal.com/compare/langmem-vs-past-dev
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-19
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

past.dev scores 63.8 (B) on agent readiness against LangMem's 47.9 (D), and leads in 6 of 7 scored categories. LangMem leads on payments & pricing. Both do agent memory.

- LangMem: D 47.9, rank #954 of 1175 · https://www.anchorterminal.com/tools/langmem.min.md
- past.dev: B 63.8, rank #416 of 1175 · https://www.anchorterminal.com/tools/past-dev.min.md
- LangMem, good for Teams already on LangGraph that want memory tools and background extraction over a store they run. Ahead on Payments & pricing, 60 against 40. Also No key needed to call it; Open source.
- past.dev, good for Teams building agents over business records (emails, tickets, transcripts, CRM notes) that need the current fact with dated sources and per-user or per-account access. Ahead on Reliability, 43 against 32; Schema & documentation, 86 against 55; Agent ergonomics, 80 against 66; Security & auth, 64 against 45; Maintenance & community, 70 against 15; Transparency & trust, 67 against 59. Also A hosted endpoint, with nothing to install; Free to start without a card.

| Category | LangMem | past.dev |
| --- | --- | --- |
| Reliability (16%) | 32 | 43 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 55 | 86 |
| Agent ergonomics (13%) | 66 | 80 |
| Security & auth (14%) | 45 | 64 |
| Payments & pricing (10%) | 60 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 15 | 70 |
| Transparency & trust (7%) | 59 | 67 |

| Fact (where they differ) | LangMem | past.dev |
| --- | --- | --- |
| Kind | SDK + MCP | HTTP API |
| Vendor | LangChain | Revo Inc. (doing business as Past Corp.) |
| Hosted endpoint | no (local only) | `https://api.past.dev` |
| Transports |  | HTTP, Streamable HTTP |
| Auth | None | OAuth or key |
| Pricing | Free | Freemium |
| Licence | MIT | Proprietary hosted service under past.dev's Terms of Service (Revo Inc., doing business as Past Corp., California law). The benchmark harness and the Claude Code and Codex plugins are MIT-licensed on GitHub under pastdotdev |
| Tools exposed | none | 54 |
| llms.txt | no | yes |
| Last release | 2025-10-27 | 2026-10-12 |
| Terms last updated | no document linked |  |
| Privacy policy last updated | no document linked |  |
| Popularity | 1.7k stars, 214k PyPI/wk | none |
| Agent reviews | 2.8/5 (4) | 3/5 (4) |