AI agents

MemOS

Memory for agents that a human can actually inspect and edit

Visit official page 日本語で詳しく見る

Popularity

★ 11k

Last update

August 2026

License / pricing

Apache-2.0

What it does

A memory layer unifying store, retrieve and manage for long-lived agents, with memories held as a graph that is inspectable and editable by design rather than an opaque vector blob — which is what makes "why did it answer that" a question you can follow. Covers knowledge bases, multi-modal content and tool-use history. Inspectable cuts both ways: decide retention, deletion and who can read it before storing personal conversations. Apache-2.0.

Summary based on the project's own description. The Japanese page has a fuller beginner guide: setup difficulty, what to prepare, and a step-by-step start.

Screenshots & visuals

Before you start

Setup difficultySome setup needed
Command lineRequired
API keyRequired
Sends data onlineYes

Judged automatically from the project's own metadata. Always confirm on the official page.

MemOS FAQ

Is MemOS free?: MemOS itself is free, but it needs an API key for an external AI service. That service charges separately, though some have a free tier.
Do I need to install anything or write code to use MemOS?: It needs the command line. If you are not comfortable typing commands, expect to get stuck during setup.
Does MemOS work on a phone?: No. It needs a computer.
Can I use MemOS commercially?: The licence is Apache-2.0, which permits commercial use. Conditions such as keeping the copyright notice still apply, so read the licence text before shipping it inside something.

How it compares

The conditions that decide whether you can actually use it, side by side.

Tool	Command line	API key	Sends data out	Phone	Commercial use
MemOS (this page)	Required	Required	Yes	No	Yes
cognee	Required	Required	Yes	No	Yes
Letta	Required	Required	Yes	No	Yes
memvid	Required	Not needed	No	No	Yes

"Sends data out" means your input is uploaded to someone's server. Pick "No" when the material cannot leave your organisation.

Other ai agents tools

cognee

Gives agents memory that survives the end of the session

Letta

An AI agent that remembers your past conversations and tasks.

memvid

Packs an agent's whole memory into one portable file

openclaw

A personal assistant that answers on the messaging apps you already use

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What it does

Summary based on the project's own description. The Japanese page has a fuller beginner guide: setup difficulty, what to prepare, and a step-by-step start.

MemOS FAQ

Is MemOS free?

MemOS itself is free, but it needs an API key for an external AI service. That service charges separately, though some have a free tier.

Do I need to install anything or write code to use MemOS?

It needs the command line. If you are not comfortable typing commands, expect to get stuck during setup.

Does MemOS work on a phone?

No. It needs a computer.

Can I use MemOS commercially?

The licence is Apache-2.0, which permits commercial use. Conditions such as keeping the copyright notice still apply, so read the licence text before shipping it inside something.

How it compares

The conditions that decide whether you can actually use it, side by side.

Tool	Command line	API key	Sends data out	Phone	Commercial use
MemOS (this page)	Required	Required	Yes	No	Yes
cognee	Required	Required	Yes	No	Yes
Letta	Required	Required	Yes	No	Yes
memvid	Required	Not needed	No	No	Yes

"Sends data out" means your input is uploaded to someone's server. Pick "No" when the material cannot leave your organisation.