Matters

Open source · Local-first · macOS

The mailbox with your LLMs built in.

Ask your mail, sort it and draft replies with the models you already have. Fast, and stored on your computer.

  • Claudeyour plan
  • ChatGPTyour plan
  • Ollamalocal
  • + yours
Get Matters Source on GitHub

What matters weighs more.

01 Ask

Type what you want.

An agent reads your mail and shows what fits, with a reason on every row.

prompt:"invoices I still have to pay" ⌘K

3 of 212 fit · read on this Mac

JW Jonas Weber Invoice 2026/114 Due on Friday. No payment in your mail.
NS Northlight Studio October retainer Sent twice. You have not answered.
TH Tide Hosting Renewal failed The card was declined. Service ends on 14 Nov.

02 Keep

Save it as a tab.

A saved prompt keeps reading new mail as it arrives.

Needs you 3 Inbox 42 Waiting on them 5 Receipts 48 + Save view Unpaid invoices 3

has:attachment prompt:"invoices I still have to pay"

03 Agents

Your agents. Your plans.

It runs on the subscription you already pay for, or on a model on your Mac. With a plan, the mail the agent reads goes to that provider. With a local model, nothing leaves.

The agent runs on
  • Claude Codeyour Claude plan 87% left
  • Codexyour ChatGPT plan signed in
  • Ollamaon this Mac · mail never leaves it llama3.2
  • API keysoon
  • Your runtimeone small interface How →

04 Speed

Fast is the foundation.

The screen reads only a local database. The network is never in the way.

< 500ms
launch to inbox
< 50ms
open a thread
< 16ms
per search keystroke

Budgets, measured on mailboxes of 8,000, 100,000 and 500,000 messages.

05 Extend

One core. The rest plugs in.

Mail, storage and models are adapters behind small interfaces. Add one and the core stays as it is.

Write an adapter
The core in the middle with adapters around it. Today: IMAP and SMTP for mail; Claude Code, Codex and Ollama as agents; SQLite for storage; the macOS Keychain for secrets. Next: Gmail, JMAP and Microsoft Graph. One place is left for your own adapter. MAIL IMAP · SMTP AGENTS Claude Code Codex Ollama STORE SQLite SECRETS Keychain NEXT Gmail · JMAP Graph YOURS + adapter CORE

06 Next

Yet to come.

  • Downloadssigned builds, updates
  • Browser sign-inGmail, Microsoft 365
  • API keysany provider
  • Linux · Windowsbuilds and testers
  • Yoursopen an issue ↗

07 Open source

Open. All of it.

Every decision is written down. Read it, run it, change it.

  • AGPL-3.0 licence
  • 120+ decision records
  • 0 servers of ours
Star on GitHub Decision records 
$ git clone https://github.com/milolabs/matters-app
$ cd matters-app
$ bun install
$ bun run dev:desktop:demo
✓ a made-up mailbox of 8,000 messages, no account needed

Get Matters.

Download GitHub

Releases are on GitHub. Until the first one, you build it from source.