> Source: https://www.esfis.com/en/about · esfis, your projects, your context, your agents. Updated 17 September 2026.

# Your context is yours, not the model's.

Agents already remember things. What none of them does is decide what each AI should know about this project, right now, and why. That is what we are building.

## What esfis is today

A macOS app for working on your projects with the AI agents you already use, with a single context for all of them.

Projectsyour folders

AgentsClaude Code, Codex, Copilot, Grok, Ollama

Context~/.esfis, on your Mac

Accountnot needed

MacmacOS 14 or later

Status1.8 · early access

## The problem

Every agent carries its own notebook: `CLAUDE.md`, `AGENTS.md`, automatic memories, rules. None of them is yours, none of them talks to the others, and all of them fill up with things that stopped being true a while ago.

You are the one who pays for it. You explain the project again every time you change tool, and you never really know what any of them knows.

## What we are building

One place to work with every agent, and a layer of context that lives on your computer. Of every item it stores, esfis knows three things:

Where it came from

The source, the date, and whether it was stated or inferred. An inference never passes for a fact.

When it changed

A new decision supersedes the old one, which becomes history instead of sitting alongside it.

Who can see it

Every project and every client has its own space. What belongs to one never reaches another.

With that, one agent picks up where another left off, and you can check what each one received. We go into it properly in [Context, not memory](https://www.esfis.com/en/blog/context-not-memory), and how it works is in the [documentation](https://www.esfis.com/en/docs).

## How we work

Local firstIf a feature needs our servers, we ask ourselves whether it should exist.
Say what is measured and what is notWe have not benchmarked esfis against anything yet, which is why there is not a single number on this site.
Small on purposeOne product, done properly. We would rather say no than spread ourselves thin.
Write it downDecisions live in the [changelog](https://www.esfis.com/en/changelog) and on the [blog](https://www.esfis.com/en/blog). If it was not written down, it did not happen.

## What we will not do

Watch everything, just in caseWe will not record your screen or read your mail. The minimum useful context is the opposite of all observable activity.
Read what you storeYour context does not reach us. When sync arrives, it will be end-to-end encrypted.
Make you change toolsThe folders, the agents and the instruction files stay yours.

## Who is behind it

esfis is built in Barcelona and is a project by [f.cat](https://f.cat).

The name comes from a dry stem that sat on the desk where the first prototype was written: two small seed pods on a single stalk, still holding on well after the season had passed.

Write to us at [esfis@f.cat](mailto:esfis@f.cat). A person reads the mail.

[Request early access](https://www.esfis.com/en/early-access)[Brand resources](https://www.esfis.com/en/brand)