Curier

Your inbox, as a feed.

Curier is a small, open-source email client for macOS. It groups newsletters and subscriptions into feeds you can skim like a timeline, and keeps everything on your machine.

Download for macOS View the source

Apple Silicon. MIT licensed. Gmail today, Outlook in progress.

Curier's feeds view: four columns labelled Newsletters, Receipts, GitHub and People, each listing messages, with two account tabs across the top
The feeds view, shown with Curier's built-in demo data.
What this is. A personal tool, built almost entirely with AI coding agents, that the author uses every day to read mail. It has rough edges and it is not trying to replace a full mail client. If you want a lightweight way to parse your inbox in something other than a chronological pile, it might be for you.

What it does

A short list, on purpose.

Feeds

Build feeds from rules like sender, subject, or tag. Newsletters and receipts land in their own columns instead of burying the mail that matters.

Tabs

Accounts, feeds, messages, and drafts open as tabs. Each tab carries its account color so you always know which inbox you are in.

Rules and tags

Tag messages by hand or let rules do it on sync. Feeds are built from tags, so the sorting you set up once keeps working.

Search and offline cache

Messages are cached in a local SQLite database, so search is instant and the app still opens when the network does not.

Dark mode

Follows the system theme. Email content renders on its own card so dark text stays readable whatever the message assumes.

Safe rendering

HTML mail is sanitized in Rust and shown in a sandboxed frame. Remote images and tracking pixels stay blocked until you choose to load them.

Your mail stays yours

There is no Curier server. Nothing about your account or your messages leaves your Mac except the requests the app makes directly to your mail provider.

Your own OAuth app

You create a Google Cloud project and Curier talks to Gmail with your credentials, over OAuth with PKCE. It asks for read and send permission only, never the ability to delete or modify your mailbox.

Keychain for secrets

Client credentials and tokens live in the macOS Keychain. Nothing secret is written to a plain file.

Local cache, local rules

The message cache, your tags, and your feed rules are files on your disk. Delete the app's data folder and they are gone.

Readable source

Everything, including the security notes and the test suite, is in the repository under the MIT license.

Install

Builds are not notarized, so macOS will call the app damaged on first launch. It is not; the quarantine flag just needs clearing.

  1. Download the latest .dmg from the releases page and drag Curier into Applications.
  2. Clear the quarantine flag once: 
    xattr -dr com.apple.quarantine /Applications/Curier.app
  3. Create Google OAuth credentials by following the Gmail setup guide, then add your account inside Curier.

Prefer to build it yourself? Clone the repo and run npm install then npm run tauri build. You will need Node and Rust.