Automation Integration · head to head
Letta vs Relevance AI
Relevance AI
Automation Integration
Specialist AI Agents for Every Task
- From
- On request
- Rated
- -
The short version
- Only Letta has a free tier, so it costs nothing to try first.
- Each has a real cost: Letta free tier limited to 3 stateful agents; Relevance AI no published standard pricing tiers or plans
- Prices and features above were last checked on 29 August 2026.
Where they differ
Only the attributes on which Letta and Relevance AI actually diverge.
| Attribute | Letta | Relevance AI |
|---|---|---|
| Starting price | Free | On request |
| Pricing model | freemium | usage-based |
| Free tier | Yes | No |
Identical on both: platforms (Web), user rating (Not yet rated), category (Automation Integration).
What people use each for
The jobs each tool is most often brought in to do.
Letta
- Building agents with memory for continuous learningnot Relevance AI
- Enabling reflection during idle periods via sleep-computenot Relevance AI
- Managing agent context and extracting learningsnot Relevance AI
Relevance AI
- AI agent platform for automating business processes with LLMsnot Letta
- Low-code automation and workflow orchestration using language modelsnot Letta
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Letta
- Free tier limited to 3 stateful agents
- Pro tier capped at 20 stateful agents
- API Plan usage charges apply beyond base tier
Relevance AI
- No published standard pricing tiers or plans
- Pay-per-task model pricing varies significantly by AI model selection
- Enterprise quotes require direct contact with sales
- Task costs range from 0.01 to 0.11 USD depending on model used
Pricing, plan by plan
Letta
Free- FreeFree
- Limited agents
- Limited Letta Auto usage
- Bring your own API keys
- Pro$20/month
- Weekly and monthly Letta Auto quota
- Pay-as-you-go overage
- Up to 20 stateful agents
- API Plan$20/month
- Unlimited agents
- $0.10/active agent/month
- $0.00015/second for tool execution
- Teams Pro$20/month
- Per seat pricing
- Add teammates
- Letta Auto quota
Relevance AI
On requestNo published plan breakdown. See the Relevance AI review.
Which should you pick?
Choose Relevance AI if
Nothing in the data separates Relevance AI from Letta on the points above - pick on price and on how each one feels to use.
Questions people ask
- Is Letta or Relevance AI better?
- Neither clearly leads. Letta starts at Free and Relevance AI at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Letta or Relevance AI?
- Letta has a free tier; the other does not. Paid plans start at Free for Letta and On request for Relevance AI.
- Does Letta or Relevance AI run on more platforms?
- Both run on Web, so platform support will not decide this one for you.
- Can I use Letta for free?
- Yes. Letta has a free tier, so you can try it without paying. Relevance AI starts at On request.
- What is Letta best used for?
- Letta is most often used for building agents with memory for continuous learning, enabling reflection during idle periods via sleep-compute, managing agent context and extracting learnings. Of those, building agents with memory for continuous learning and enabling reflection during idle periods via sleep-compute are not what Relevance AI is typically brought in for.
Answered from the vendors’ own pages
Letta: How much does Letta cost?
Letta offers a free tier, then Pro plan at $20/month with up to 20 stateful agents, API Plan at $20/month base plus usage charges ($0.10/active agent/month, $0.00015/second for tool execution), and Teams Pro at $20/seat/month.
SourceRelevance AI: What is Relevance AI's pricing model?
Relevance AI uses a pay-per-task model where costs vary by AI model selected. Average cost per task is approximately 0.09 USD, with actual costs ranging from 0.01 to 0.11 USD depending on which model the system routes to. The platform automatically selects the lowest-cost model that meets performance requirements.
SourceLetta: How many agents can I create on the free plan?
The free tier is limited to 3 stateful agents. Pro plan allows up to 20 stateful agents, while API Plan offers unlimited agents.
SourceRelevance AI: How much do Relevance AI tasks cost?
Task costs depend on model selection. Example usage shows customers spending 11800 USD monthly while processing 1.24 million tasks. For enterprise custom pricing, users must book a demo or contact the sales team.
SourceLetta: Does Letta charge for tool execution?
On the API Plan, Letta charges $0.00015 per second for tool execution. The Pro and Teams Pro plans include execution in their monthly fee.
SourceRelated pages
More on Relevance AI
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