Letta vs Mem0 (2026): which should you pick?
As of Nov 12, 2026, Mem0 grades higher than Letta: 2.6 against 2.0 out of 4.0.
Checked Nov 12, 2026 · graded Nov 12, 2026 by ToolGPA
Mem0 grades higher on value for money and the free plan. They get the same grade on features, ease of use and platforms.
Price, platforms and features side by side. The table says where each price was read and when.
Letta
Stateful agents with long-term memory, from the MemGPT team
Free plan · from $20/mo
Which one is for you
Pick Letta if
- Fits if you are a developer who wants agents that keep their memory between runs
- Works for people who already pay for a coding plan and can bring that key
Look elsewhere if
- Tight if you stay free, because there is no included model usage and 3 agents is the cap
- Pricey if you code heavily, as the pricing page says $100 to $200 a month or more of usage
- Watch out: server tool time is billed at $0.00015 a second against your credits
- Watch out: more than one person needs Teams Pro, since Pro covers a single user
Pick Mem0 if
- Fits if you are a developer who wants your agent to remember users
- Works for teams already on LangChain, CrewAI or the Vercel AI SDK
Look elsewhere if
- Skip it if you want a finished agent, as it is only the memory part
- Tight if you stay free, since after 30 days hosted model calls need your own LLM key
- Not for you if you need graph memory or SSO, because those are Custom only
- Watch out: usage past the free limits is billed, but the page states no rates
How we grade them
| 2.0GPALettaFair | 2.6GPAMem0Good | |
|---|---|---|
| Value for money | CPro is $20 a month with $20 of credits, around the category's $21 middle. Teams Pro is $20 a seat. | AAn open-source version you can run yourself, and a Free plan with unlimited end users. The only other plan is Custom, with no price shown. |
| Free plan and trial | CFree covers 3 stateful agents but no model usage, so you bring your own keys or buy credits. | BFree gives 10,000 adds and 1,000 retrievals a month for 30 days, then 50,000 adds and 10,000 retrievals with your own LLM key. |
| Features | CPersistent memory, a coding CLI, an SDK, and Slack and GitHub channels. Memory repositories are capped at 5 MiB on Free, and web search and tools spend credits. | CIt does the memory job fully but only that job. Graph memory, user profiles, analytics and SSO are Custom only. |
| Ease of use | DNo store rating, and the main route is an npm-installed CLI and SDK, so you work from a command line. | DNo store rating, and you add it to your own agent through SDKs or an MCP server. |
| Platforms and integrations | BWeb plus a CLI and SDK, with Slack, GitHub, Telegram, Discord, WhatsApp and Signal channels. | BWeb, with Python and JavaScript SDKs and LangChain, CrewAI, LlamaIndex, Claude Code and Cursor listed. |
| Best for | developers building agents that remember across sessions | adding long-term memory to an AI agent through code |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: Letta and Mem0. How we grade
Where they differ
- Mem0 is self-hostable, according to its own site.
- Letta also covers workflow automation.
In commonFree planWebOpen sourcePublic APIAI featuresAI agents
At a glance
| Letta | Mem0 | |
|---|---|---|
| Pricing | Free plan | Free plan |
| Starts at | $20 per month | Not published |
| Free plan | Up to 3 stateful agents and 5 MiB per memory repository; bring your own API keys or an external coding plan. | Unlimited end users; 10,000 adds and 1,000 retrievals a month for the first 30 days, or 50,000 adds and 10,000 retrievals a month with your own LLM key. |
| Free trial | None listed | None listed |
| Web | ||
| Made by | Letta, Inc. | Mem0 |
| Price read from | docs.letta.com | mem0.ai |
| Checked | Nov 12, 2026 | Nov 12, 2026 |
Worth knowing
Letta
- The free plan has no included model usage; you bring your own keys or buy credits.
- Credits are spent by model usage at provider-based rates, and the pricing page says heavy coding use can run $100 to $200 a month or more.
- Server-side tool time is billed at $0.00015 per second against credits, and web search and fetch tools also cost credits.
- Adding members to an organization needs Teams Pro; Pro covers a single user.
Mem0
- The pricing page shows only a Free plan and a Custom plan; the price of Custom is not published.
- The Free plan includes 10,000 adds and 1,000 retrievals for the first 30 days with model calls on Mem0; after that you supply your own LLM key.
- Graph memory, user profiles, advanced analytics, SSO, audit logs and on-prem deployment are limited to Custom.
- Past the free limits, usage is billed, but the page does not state the rates.
Key features
Letta
- Persistent agent memory
- Agents are stateful: they carry memory across sessions, and memory repositories are versioned in git so changes can be tracked.
- Letta Code CLI
- An open-source harness installed with npm for coding agents, personal assistants and agents that work on local files, with skills and schedules.
- Agent SDK and app server
- Developers can embed stateful agents in their own applications, with a self-hosting option and a protocol for external tools.
- Channels and cloud agents
- Cloud-hosted agents connect to Slack and a GitHub integration; the channels guide also lists Telegram, Discord, WhatsApp and Signal.
- Bring your own keys
- All plans accept your own model API keys, and usage then goes through your provider account instead of using Letta credits.
Mem0
- Persistent memory
- Messages are added per user and searched later, so an agent can recall preferences and facts across sessions.
- Memory compression
- The vendor says chat history is condensed into compact memories to cut tokens and latency.
- Python and JavaScript SDKs
- A few lines of code add and search memories, and the docs include setup guides for 22 frameworks and tools such as LangChain, CrewAI and the Vercel AI SDK.
- Coding-agent plugins and MCP
- Guides cover adding memory to Claude Code, Cursor, Codex and other coding agents, and an MCP integration is listed.
- Graph memory and user profiles
- Entity linking and user profiles are listed on the Custom plan only.
- Open-source version
- The same memory layer can run as a library or a Docker stack on your own infrastructure under an Apache-2.0 license.
Plans
Letta
Free$0
per month
Up to 3 stateful agents; no included model usage, so bring your own keys or buy credits.
Pro$20
per month
Includes $20 of credits a month for any model and remote sandboxes, up to 20 stateful agents.
Teams Pro$20
per seat / month
Everything in Pro, plus teammates in an organization, shared agents and access control.
EnterpriseCustom
Volume-based pricing with role-based access control, SAML/OIDC SSO and dedicated support.
Mem0
Free$0
Unlimited end users, community support, and usage-based billing past the limits with a monthly cap you set.
CustomCustom
Limits set to your volume, graph memory, user profiles, advanced analytics, private Slack support, SSO, audit logs, SLA and on-prem deployment.
Common questions
Which is cheaper, Letta or Mem0?
As of Nov 12, 2026, Letta starts at $20 per month, and Mem0 publishes no starting price.
Which has a free plan, Letta or Mem0?
As of Nov 12, 2026, both Letta and Mem0 have a free plan.
More comparisons
How this page was made
- The verdict at the top follows a fixed rule. When both tools are in the same category and either is in our top three for it, the verdict follows that ranking: the higher-placed tool is our pick. The top three weigh who each tool suits as well as its grades, so a pick can go against the GPA. Otherwise the page does not pick one and says which grades higher: the higher GPA first; on a tie, the one with a free plan, then the one that starts cheaper in dollars a month, counted the same way for both; if they are still level, what the choice depends on.
- The grades are our own, from each tool’s review or report card. The GPA is their average.
- Prices, plans and platforms come from each tool’s listing. The table above says where each price was read and when.
- The differences and the answers to the questions are worked out from those listings.