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Long-term memory for agents
The best memory layer for agents that remember across sessions is Mem0 because it scores highest on our published formula (81.8/100): Open-source memory layer with a free hosted Hobby tier.
The job: “I want my agent to remember users and facts across sessions.” · Last checked
Mem0
Open-source memory layer with a free hosted Hobby tier.
Not for: Apps that only need short chat history.
Pricing: Open source. Cloud: Hobby free; Starter $19/mo; higher tier $249/mo. source, checked 2026-10-19
Visit Mem0 ↗Letta
Open-source platform for stateful agents with built-in memory.
Not for: People who want a drop-in memory API instead of a full agent runtime.
Pricing: Open source; hosted pricing not checked. source
Score breakdown
| Tool | Fit (editorial) ×0.4 | Adoption (GitHub stars) ×0.25 | Momentum (release freshness) ×0.2 | Attention (HN, 30d) ×0.15 | Score |
|---|---|---|---|---|---|
| Mem0 | 5/5 → 1 | 67.5k★ → 0.905 | Sep 25, 2026 → 0.731 | 7 pts → 0.306 | 81.8 |
| Letta | 4/5 → 0.75 | 25.2k★ → 0.825 | May 14, 2026 → 0 | 0 pts → 0 | 50.6 |
Missing signals are dropped and the remaining weights re-normalized. See methodology. Signals fetched Oct 19, 2026.
FAQ
What is the best memory layer for agents that remember across sessions?
The best memory layer for agents that remember across sessions is Mem0 because it scores highest on our published formula (81.8/100): Open-source memory layer with a free hosted Hobby tier.
What is the best alternative to Mem0?
Our runner-up is Letta (50.6/100). Open-source platform for stateful agents with built-in memory. Not for: People who want a drop-in memory API instead of a full agent runtime.
Who should not use Mem0?
Apps that only need short chat history.
How much does Mem0 cost?
Open source. Cloud: Hobby free; Starter $19/mo; higher tier $249/mo. (checked 2026-10-19, source: https://mem0.ai/pricing)
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