Letta vs MemMachine
A side-by-side comparison of Letta and MemMachine, two Memory tools, drawn from Ignaite's continuously-verified listings.
Compared from listings verified as of
At a glance
| Attribute | Letta | MemMachine |
|---|---|---|
| Category | Memory | Memory |
| Pricing (differs) | FREEMIUM | FREE |
| License (differs) | Open core | Open source |
| Deployment (differs) | Hybrid | Self-host |
| Platforms (differs) | API, CLI, macOS, Windows, Linux | API, CLI |
| Model support (differs) | BYO key / model | Model-agnostic |
| Vendor (differs) | Letta | MemMachine |
| Capabilities (differs) |
|
|
The honest brief
Letta
The productized MemGPT successor — agents edit their own memory blocks (memory-as-OS) to manage a finite context window.
- Self-editing agent memory
- Open source, model-agnostic
- REST APIs + multi-language SDKs
- Reference architecture for memory
- Developer-focused, not no-code
- Memory model has a learning curve
- Younger, evolving framework
MemMachine
Pairs episodic (conversational) and profile (long-term user-fact) memory in one model-agnostic, self-hostable layer.
- Fully open source (Apache-2.0)
- Recall persists across sessions
- Model-agnostic across providers
- Self-hostable, Python-first
- Younger than Mem0/Zep
- Self-hosting and ops on you
- Managed enterprise tier not yet GA
When to pick which
Across the signals we compare, Letta and MemMachine differ on pricing, license, deployment, and platforms:
- Pricing
- FREEMIUM · FREE
- License
- Open core · Open source
- Deployment
- Hybrid · Self-host
- Platforms
- API, CLI, macOS, Windows, Linux · API, CLI
Their capability lists differ in recorded depth — compare the full lists above before deciding.