kitio.aiLetta vs Mastra
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Letta has the lower starting price: about $20 a month, against $250 for Mastra.
At a glance
Best for
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Persistent agent memory
- Agent SDK and API
- Agent Development Environment
- Cloud or self-hosted
- Agent export and import
- Agents with tools and memory
- Workflow graphs
- RAG helpers
- Local dev playground
- Evals and tracing
| Feature | Letta | Mastra |
|---|---|---|
| Best for | Platform for stateful AI agents with long-term memory | TypeScript framework for building AI agents and workflows |
| Category | Agents & automation | Agents & automation |
| Pricing model | Freemium | Freemium |
| Starting price | $20/mo | $250/mo |
| Free plan | Yes | Yes |
| Made by | Letta | Mastra |
| Based in | United States | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Letta has the lower starting price: about $20 a month, against $250 for Mastra.
Free plan
Cheapest paid plan
Top plan
Free trial
5 plans
Free
Free
- Limited stateful agents
- 5 MiB storage per memory repo
- Bring your own API keys
Pro
$20/mo
- Up to 20 stateful agents
- Letta Auto weekly + monthly quota
- 50 MiB storage per memory repo
Teams Pro
$20/mo
- Per seat
- Share agents with access control
- All Pro features
API Plan
$0.10 / active agent / mo
- Unlimited agents
- $0.00015 per sec tool execution
- Pay-as-you-go LLM usage
Enterprise
Contact sales
- Role-based access control
- SAML/OIDC SSO
- Dedicated support
3 plans
Starter
Free
- 100K observability events
- 24 CPU hours
- 15-day data retention
- Unlimited users and projects
Teams
$250/mo
- 1M observability events
- 250 CPU hours
- 6-month data retention
- SSO and SOC 2 docs
Enterprise
Custom
- Custom limits and retention
- For teams at scale
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Letta
- Strong long-term memory design
- Open-source core
- Clear view of agent state
- Developer-focused
- Free plan limited to a few agents
Mastra
- Native TypeScript experience
- Good developer playground
- Deploys anywhere
- Not for no-code users
- Younger ecosystem than Python tools
Which one should you choose?
Choose Letta if you want:
- Strong long-term memory design
- Open-source core
- Clear view of agent state
Watch out: developer-focused.
Choose Mastra if you want:
- Native TypeScript experience
- Good developer playground
- Deploys anywhere
Watch out: not for no-code users.
Letta vs Mastra FAQ
What is the difference between Letta and Mastra?
Letta: Platform for stateful AI agents with long-term memory. Mastra: TypeScript framework for building AI agents and workflows. Both are agents & automation tools.
Is Letta or Mastra cheaper?
Letta has the lower starting price: about $20 a month, against $250 for Mastra.
Do Letta and Mastra have free plans?
Letta: Yes. Mastra: Yes.
Who makes Letta?
Letta is made by Letta, based in United States.
Who makes Mastra?
Mastra is made by Mastra, based in United States.
Which should I choose, Letta or Mastra?
Choose Letta if you value strong long-term memory design and open-source core. Choose Mastra if you value native typescript experience and good developer playground.