Alternatives · AI Agents
Letta alternatives
As of Nov 13, 2026, the highest-graded Letta alternative is Hermes Agent (2.8 GPA). It's also the best free one.
Letta compared with 8 alternatives: Mem0, CrewAI, OpenHands, Hermes Agent, Mastra and 3 more.
Letta has a free plan. Paid plans start at $20 per month. 7 of the 8 alternatives are free or have a free plan. One more offers a free trial.
Listings checked up to Nov 13, 2026 · Where the facts come from
Black Friday: is there a Letta sale?
At a glance
| Tool | Price | Free plan | Runs on |
|---|---|---|---|
| LettaThis tool | Free plan · from $20/mo | Yes | Web |
| Mem0 | Free plan | Yes | Web |
| CrewAI | Free plan | Yes | Web |
| OpenHands | Free plan · from $500/mo | Yes | Web |
| Hermes Agent | Free plan · from $20/mo | Yes | Web, macOS, Windows, Linux |
| Mastra | Free plan · from $25/mo | Yes | Web |
| AgentOps | Free plan · from $40/mo | Yes | Web |
| Dosu | Free plan · from $16/mo | Yes | Web |
| E2B | Free trial · from $150/mo | Trial only | Web |
Price against what you get
Letta starts at $20 a month and scores 2.0 out of 4 on features, ease of use and platforms. 1 of the 6 alternatives on this chart scores higher and starts lower: Dosu.
Hermes Agent, Mastra and AgentOps score higher without starting lower.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
How each one differs from Letta
Mem0
Memory layer that lets AI agents remember across sessions
- Mem0 is self-hostable, according to its own site.
- Mem0 does not cover workflow automation, which Letta does.
Suits: Developers adding long-term memory to chatbots, support agents and voice agents
CrewAI
Multi-agent platform to build, run and govern AI agents
- CrewAI also covers no-code.
Suits: Developers who want a free multi-agent framework with a hosted option
OpenHands
Open-source platform for AI coding agents and automations
- OpenHands starts at $500 per month for up to 10 users.
- OpenHands is self-hostable, according to its own site.
Suits: Developers who want a free, self-hosted coding agent with their own keys
Hermes Agent
Open-source AI agent with persistent memory and a messaging gateway
- Hermes Agent starts at $20 per month for the optional Nous Portal Plus tier; the agent is free.
- Hermes Agent also lists macOS, Windows and Linux apps.
- Hermes Agent is self-hostable, according to its own site.
- Hermes Agent also covers chat assistant.
Suits: Developers who want an agent on their own machine, server or VPS
Mastra
TypeScript framework for building and running AI agents
- Mastra starts at $25 per workspace / month.
- Mastra is self-hostable, according to its own site.
Suits: TypeScript teams building agents inside Next.js, React or Node apps
AgentOps
Tracing, debugging and cost tracking for AI agents
- AgentOps starts at $40 per month, pay as you go.
- AgentOps also covers reports and dashboards.
- AgentOps does not cover workflow automation, which Letta does.
Suits: Developers debugging multi-step agents built on CrewAI, LangChain or the OpenAI SDKs
Dosu
Shared knowledge layer that keeps docs and coding agents in sync
- Dosu starts at $16 per month, billed annually ($192 upfront).
- Dosu also covers chat assistant and wiki.
- Dosu does not cover workflow automation, which Letta does.
Suits: Open-source maintainers on public repositories, using the free plan
E2B
Cloud sandboxes where AI agents run code and tools
- E2B starts at $150 per month, plus per-second sandbox usage.
- E2B has no free plan, only a free trial, unlike Letta.
- E2B does not cover workflow automation, which Letta does.
Suits: Teams building coding or data-analysis agents that must execute untrusted code
Limits worth knowing in 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.
Common questions
What are the alternatives to Letta?
The alternatives to Letta in this directory are Mem0, CrewAI, OpenHands, Hermes Agent, Mastra, AgentOps, Dosu and E2B. Each one has a side-by-side comparison with Letta.
Is there a free alternative to Letta?
Yes. Mem0, CrewAI, OpenHands, Hermes Agent, Mastra, AgentOps and Dosu have a free plan alongside paid ones.
Which Letta alternatives work on Windows?
The Letta listing does not include a Windows app. Hermes Agent lists one.
Which Letta alternatives work on macOS?
The Letta listing does not include a macOS app. Hermes Agent lists one.
When were these prices checked?
Each listing shows its own date. On this page they run from Nov 9, 2026 to Nov 13, 2026. Vendors change prices without notice, so confirm on their site before you buy.