Mastra vs Letta

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Mastra compared with Letta
Detail	Mastra	Letta
What it does	TypeScript AI Framework for Agents and Apps	Machines that learn
Stage	Growing	Startup
Founded	2024	Not given
Based in	Not given	US
Pricing model	freemium	Not given
Pricing	Free tier with 100K observability events and 24 CPU hours. Teams plan at $250/month with 1M events and 250 CPU hours. Enterprise plan with custom pricing. Self-hosted Apache 2.0 license available free.	Not given
Key features	Agents with typed instructions, models, tools Workflows with typed steps, retries, and branches Harness for coordinating multi-mode agents with shared state Memory with observational context and semantic recall Model Context Protocol (MCP) server support Multi-provider model routing with 90+ providers Factory system of specialized AI agents Deployment to Vercel, Netlify, Cloudflare, or as standalone server	Memory evolution Continuous learning Identity management Capability evolution Context management
What makes it different	Purpose-built for TypeScript with native integration into React, Next.js, and Node.js Complete AI primitives in one modular framework including agents, workflows, memory, and observability Built-in observability to see exactly what agents are doing at every step Open source under Apache 2.0 with free self-hosting option	Agents that remember everything and learn continuously Memory, identity, and capabilities evolve with experience Virtual context management technology
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	77 no change since last check	73 no change since last check
Trust Flow (Majestic)	34	30
Citation Flow (Majestic)	48	49
Referring domains (Majestic)	3218	2455

4 details filled in for both companies.

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