Umbra Mail

Umbra Mail is an open source email client that batches incoming mail and organizes newsletters.

Umbra is a private and open source alternative interface for Gmail that reduces distractions. New mail arrives a few times a day and newsletters appear in a single page. Users can choose to use optional artificial intelligence. The software runs entirely on the user's computer with no tracking or server storage. It can be installed as a userscript in Violentmonkey or Tampermonkey for any browser, or through a Chrome extension.

Umbra Mail at a glance

Best for: Software engineer, Product manager, Founder
Runs on: Web, Chrome extension
Pricing: Free
Released: October 2026
Category: AI productivity tool
Website: umbra.masn.studio

Key features

Batched mail delivery a few times a day
Single-page view for newsletters
Optional artificial intelligence features
Private operation with no server storage
Open source codebase
Browser integration via userscript or extension

Use it for

Reducing distractions from constant email notifications
Reading newsletters in a single consolidated page
Managing Gmail with enhanced privacy and no tracking

Alternatives to Umbra Mail

bytemail — Connects directly to email providers without using intermediary servers.
Busymail — Connects to Gmail, Yahoo, or IMAP servers and surfaces critical messages automatically.
Curier — Keeps all mail data locally on the Mac with no intermediate servers.
Shortwave — It uses advanced AI agents to organize, write, search, and automate your inbox.
Ember — Adjusts schedules automatically when plans change throughout the day.
Claire Mail — Combines mail, calendar, reminders and AI triage in one fast app for Mac and iPhone.
EmailTriager — It automatically drafts email replies in your true voice directly inside Gmail.
Emilio — Sorts priority emails and drafts replies in your tone.
Macro — Combines email, chat, tasks, docs, and CRM in one open source workspace with AI agents.
GmailClass — Classifies inbox emails using custom descriptions and color-coded labels.
Asana — Integrates AI teammates with a shared work graph and memory for enterprise workflows.
Himaya — Autonomous email protection with self-serve onboarding in minutes.

All Umbra Mail alternatives