AgentIndex icon
AgentIndex
jamjet logo
jamjet
★ 23
vs
letta logo
letta
★ 25.2k

jamjet vs letta

jamjet: JamJet is an action-control plane for AI agents that enforces safety policy across hooks, guardrails, MCP gateways, SDKs, and custom runtimes. It blocks unsafe tool calls, requires human approval for risky actions, caps costs, and provides a durable audit trail. One policy file works everywhere, supporting frameworks like Claude Code, OpenAI Agents SDK, LangChain, and more.; letta: Letta is a powerful platform for building stateful AI agents equipped with advanced memory, enabling them to learn and self-improve over time. It provides both a command-line interface for local agent execution and a comprehensive API with Python and TypeScript SDKs for seamless integration into applications.

01

TL;DR

jamjet logo
jamjetMemory & Context · ★ 23

Calling MCP servers or arbitrary tools

Read jamjet full review →
letta logo
lettaMemory & Context · ★ 25.2k
When to choose:
  • You want a long-lived agent that remembers past work and rewrites its own memory and context over time.
  • You want one agent reachable from CLI, desktop, browser, mobile and messaging apps, with subagents, schedules and hooks.
  • You want memory you can inspect: the README says context is tracked in git and can sync to your own repository.
When to skip:
  • You only need to add memory to an agent you already use through MCP; a small MCP memory server is a lighter fit.
  • You rely on older Letta tutorials or the V1 API server: the project restructured, and the V1 server is retired.
  • You want everything to work without signing in: Letta Cloud is the default backend and some features need it.
Read letta full review →
02

Side-by-Side Comparison

Field
jamjet logojamjet
letta logoletta
Category
Memory & Context
Memory & Context
Stars
★ 23
★ 25.2k
License
Apache-2.0
Apache-2.0
Install Command
pip install jamjet
npm install -g @letta-ai/letta-code
Updated
1w ago
5d ago
Open Source
Yes
Yes
Website
↗ Visit
↗ Visit
GitHub
↗ GitHub
↗ GitHub
Tags
a2a, agent-memory, agent-safety
Stateful AI, Agent Platform, Advanced Memory
03

Features

jamjet logojamjet
01Block unsafe tool calls at runtime (e.g., database deletes, payments)
02Pause for human approval on risky actions with durable execution
03Cap cost per agent, per run, per project
04Record an append-only audit trail for regulatory review
05Replay or resume crashed runs from the last checkpoint
letta logoletta
01Build stateful AI agents with advanced memory
02Agents capable of learning and self-improvement over time
03CLI tool for running agents locally in your terminal
04Comprehensive API for integrating agents into applications
05Support for skills and subagents; fully model-agnostic
04

Use Cases

jamjet logojamjet
↳Calling MCP servers or arbitrary tools
↳Writing to a database
↳Sending emails or Slack messages
letta logoletta
↳Running AI agents locally in your terminal for coding and general tasks.
↳Integrating stateful AI agents into custom applications using the API and SDKs.
↳Developing self-improving AI systems that adapt and learn continually.
05

Best For

jamjet logojamjet
—
letta logoletta
Most PopularEssentialTrending
FAQ

FAQ

What is the difference between jamjet and letta?
Both jamjet and letta are in the Memory & Context category. jamjet has 23 stars, while letta has 25.2k stars.
Which is better, jamjet or letta?
The best choice depends on your use case. Choose jamjet if Calling MCP servers or arbitrary tools, and letta if Running AI agents locally in your terminal for coding and general tasks..
Is jamjet free or open source?
Yes, jamjet is open source on GitHub (Apache-2.0).
Is letta free or open source?
Yes, letta is open source on GitHub (Apache-2.0).
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