Letta vs Devin: Which is Better in 2026?
Choosing between Letta and Devin comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
Bottom line: Devin wins this matchup. UiPath is our overall AI Agents pick. Lucid Train is our free AI Agents pick. Pick Letta if you need AI agents.
Short on time? Here's the quick answer
We've tested both tools. Here's who should pick what:
Letta
Build AI agents that learn and improve from experience
Best for you if:
- • You want a free tier before you commit
- • You want addresses a critical limitation in current AI: memory and continuous learning
- • You want provides developer tools for building advanced, adaptive AI agents
Devin
AI software engineer by Cognition Labs
Best for you if:
- • You want aI software engineer
- • You want end-to-end tasks
| At a Glance | Letta | Devin |
|---|---|---|
Starts at | FreeFree tier available | $20/monthCore |
Best For | AI Agents | AI Coding |
Rating | - | - |
Free plan | Yes | No |
Choose Letta or Devin?
Choose Letta if
Build AI agents that learn and improve from experience
- You want a free tier before you commit
- You want addresses a critical limitation in current AI: memory and continuous learning
- You want provides developer tools for building advanced, adaptive AI agents
- Your work is AI agents-shaped, not AI coding-shaped
Choose Devin if
AI software engineer by Cognition Labs
- You want aI software engineer
- You want end-to-end tasks
- Your work is AI coding-shaped, not AI agents-shaped
| Feature | Letta | Devin |
|---|---|---|
| Pricing Model | Freemium | Paid |
| User Rating | No ratings yet | No ratings yet |
| Categories | AI AgentsDeveloper Tools | AI CodingAI Agents |
In-Depth Analysis
Letta
Build AI agents that learn and improve from experience
Letta's pricing seems fair, offering a free tier for basic exploration and a Pro tier at $20/month for personal use with a decent agent allowance.
Watch out
Pay-as-you-go overage for Letta Auto
Strengths
- +Addresses a critical limitation in current AI: memory and continuous learning.
- +Provides developer tools for building advanced, adaptive AI agents.
- +Backed by significant research and expertise from leading AI institutions.
- +Emphasizes open AI principles and developer empowerment.
Weaknesses
- -The technology is highly specialized, potentially requiring advanced AI development knowledge.
- -Specific pricing and availability details for products like the SDK are not readily apparent.
- -The focus on foundational research means some applications may still be emerging.
Key features
Devin
AI software engineer by Cognition Labs
Devin's pricing is fair for individual developers with the $20/month Core plan, offering a pay-as-you-go model.
Watch out
Overage fees of $2.25/ACU on Core plan
Strengths
- +AI software engineer
- +End-to-end tasks
- +Good for automation
- +Innovative approach
- +Active development
Weaknesses
- -Waitlist/limited access
- -Expensive
- -Accuracy varies
- -Not replacement for devs
- -Early stage
Key features
Pricing: Letta vs Devin
| Plan | Letta | Devin |
|---|---|---|
| Tier 1 | $0 /month Free | $20 month Core |
| Tier 2 | $20 /month Pro | $500 month Team |
| Tier 3 | Contact us Teams / Enterprise | custom Enterprise |
Pricing verified from each vendor's public pricing page. Compare in detail on Letta pricing and Devin pricing.
Who Should Use What?
On a budget?
Letta has a free tier. Devin is paid only.
Go with: Letta
Want the highest-rated option?
Neither has ratings yet.
Too early to call on ratings — compare on features and pricing.
Value user reviews?
Neither has ratings yet.
Too early to call — neither has ratings yet.
3 Questions to Help You Decide
What's your budget?
Letta is freemium. Devin is paid. Letta lets you start free.
What's your use case?
Letta is a AI agents tool. Devin is in AI coding. Pick the category that matches your needs.
How important are ratings?
Neither has ratings yet.
Key Takeaways
Devin
- Our pick for this comparison
Letta
- Has a free tier
- Better fit for AI agents
The Bottom Line
Devin wins this matchup. UiPath is our overall AI Agents pick. Lucid Train is our free AI Agents pick. Letta has a free tier if you want to test without paying.
Frequently Asked Questions
Is Letta or Devin better?
Devin is rated in our evaluation. Letta is freemium and Devin is paid.
What are Letta and Devin used for?
Letta: Build AI agents that learn and improve from experience. Devin: AI software engineer by Cognition Labs.
What does Letta cost vs Devin?
Letta is freemium (free tier + paid plans). Devin is a paid tool. Visit their websites for detailed pricing.