Agentic Index
Letta vs Mem0 (2026)
Choose Mem0 if you want a memory layer to drop into agents you already have, and choose Letta if you want a full stateful agent platform where memory is the architecture. That verdict is the Agentic Index coverage score, graded from each vendor's own published materials.
Mem0 is open source with cloud plans from 19 dollars a month and a free tier, while Letta offers a free tier, Pro at 20 dollars a month, a usage based API, and Apache 2.0 self hosting. Letta's center of gravity has shifted toward Letta Code, so evaluate its platform roadmap with that in mind; Mem0 remains a focused add and search memory API.
On the Agentic Index agent infrastructure ranking, neither Letta nor Mem0 clears the bar, which asks for all five production contract capabilities documented in full. Letta documents two of the five in full; Mem0 does not document testing, debugging and optimization in full, nor observability and auditability. 34 of the 186 vendors in the lane clear it. See the agent infrastructure ranking
This comparison is published by Agentic Index, an independent agentic AI vendor research platform. Letta and Mem0 are each graded against the same 14 capability Agentic Index taxonomy, from the vendor's own public materials under the Agentic Index verification standard, alongside 956 researched vendors. No vendor pays for placement and no vendor has reviewed this page. How this evidence is graded
Choose Letta if
- You want the agent runtime and its memory designed together, not bolted on
- Inspectable, tiered memory from the MemGPT lineage matches your architecture
- Managed state, sandboxing, and durable execution from one platform appeal
Choose Mem0 if
- You are keeping your existing framework and just need persistent recall
- A simple add and search API with token cost savings is the whole requirement
- Open source self hosting of a small component beats adopting a platform
| At a glance | Letta | Mem0 |
|---|---|---|
| Category | Agent infrastructure | Agent infrastructure |
| Entry price | Free tier · Pro $20/mo · API plan $20/mo plus usage · self-host free | From $19/mo · free tier (10k add, 1k retrieval/mo) + open source |
| Free / trial | Free account, no card (up to 3 agents with managed state; BYOK unlimited locally) | Free Hobby tier: 10,000 add and 1,000 retrieval requests/month, 1 project, community support. Open source (Apache 2.0) and self hostable at no license cost. |
| Pricing confidence | public exact | public exact |
| Feature | L Letta |
M Mem0 |
|---|---|---|
| Action & orchestration | ||
|
Integrations & Tool Calling Ability to connect agents to real systems through native integrations, OAuth-authenticated actions, custom tools, APIs, webhooks, or MCP-compatible tools. |
Full / Explicit | Partial |
|
Workflow Orchestration Ability to sequence, branch, retry, route, and combine deterministic workflow nodes with autonomous agent steps. |
Full / Explicit | No / Not documented |
|
Triggers & Channel Coverage How agents wake up and where they work: schedules, webhooks, message events, CRM events, inbox events, chat, email, voice, and collaboration tools. |
Full / Explicit | No / Not documented |
| Knowledge & context | ||
|
Knowledge Grounding & RAG Ability to ground agent behavior in company data through document ingestion, retrieval, external knowledge APIs, semantic search, or RAG layers. |
Partial | No / Not documented |
|
Memory & State Persistence Ability to persist context across a run, conversation, workflow, user, team, or longer-term memory layer. |
Full / Explicit | Full / Explicit |
| Control & trust | ||
|
Human Oversight & Guardrails Approval steps, consent checkpoints, escalation rules, structured guardrails, policy constraints, and pause/resume controls. |
Full / Explicit | No / Not documented |
|
Security, Identity & Governance RBAC, SSO, auditability, encryption, least-privilege tool access, compliance posture, and data handling policy. |
Partial | Full / Explicit |
|
Observability & Auditability Traces, logs, execution histories, metrics, audit events, and debugging detail for production agent behavior. |
Partial | Partial |
|
Deployment & Data Residency Deployment modes and options, including SaaS, dedicated cloud, VPC, on-prem, hybrid, local runtime, and self-hosting. |
Full / Explicit | Full / Explicit |
| Solution readiness | ||
|
Prebuilt Agents, Templates & Packs Ready-made workflows, packaged employees, templates, blueprints, industry solutions, and role-specific agents that reduce time-to-value. |
Partial | No / Not documented |
| Platform extensibility | ||
|
Model Flexibility & Routing Ability to work across multiple foundation models, route tasks to different models, or let buyers bring their own providers and keys. |
Full / Explicit | Full / Explicit |
|
APIs, SDKs & MCP Extensibility Composability layer: stable APIs, SDKs, MCP tool consumption/serving, custom tools, and integration into internal systems. |
Full / Explicit | Full / Explicit |
|
Testing, Debugging & Optimization Testing, debugging, scoring, retries, fallbacks, quality gates, and optimization loops for improving agent workflows before and after deployment. |
No / Not documented | No / Not documented |
| Specialist automation | ||
|
Browser & Computer Use Browser, desktop, or remote/local computer control for workflows that cannot be handled through stable APIs alone. |
No / Not documented | No / Not documented |
Pricing snapshot
Sourced from the Index pricing dataset · open each vendor's profile for full detail.
| Pricing | L Letta |
M Mem0 |
|---|---|---|
|
Entry price Lowest public entry point |
Free tier · Pro $20/mo · API plan $20/mo plus usage · self-host free | From $19/mo · free tier (10k add, 1k retrieval/mo) + open source |
|
Pricing confidence How public the numbers are |
Public, exact | Public, exact |
|
Billing Primary billing axis |
usage | Subscription tiers metered by memory add and retrieval requests per month and number of projects; usage based pricing also available |
|
Variable cost Workload / overage exposure |
High variable cost | Medium variable cost |
|
Free tier / trial Try before you buy |
Free tier
|
Free tier
|
|
Buying motion Self-serve vs sales call |
Mixed | Self-serve |
More comparisons with Letta or Mem0
Other matchups in agent infrastructure platforms
Not the pairing you were after? These compare a different set of agent infrastructure platforms on the same 14 capabilities.