Mailspring

Active

Country: United States (US)
Founded: 2017
Developer: Foundry 376
Pricing: Freemium ($8/mo for Pro)
Open source: Yes
Platforms: macOS, Windows, Linux

Indexes

Email Clients

Overview

Mailspring is a desktop email client that supports multiple accounts via IMAP and SMTP, including providers like Gmail, Office 365, iCloud, Outlook.com, Yahoo, and FastMail. It offers a unified inbox, fast search, and features such as undo send, mail rules, signatures, and spell checking. Pro version adds read receipts, link tracking, send later, reminders, contact profiles, and email analytics. Designed for users managing high email volumes across accounts, it emphasizes low resource use with a native C++ sync engine and active development resumed in 2025.

Key Features

Unified Inbox - Combines messages from multiple accounts into a single view.
Lightning-fast Search - Indexes mail for quick searches across all connected accounts.
Mail Rules - Automates inbox organization with custom rules.
Contact Profiles - Displays bios, social links, message history, and company details for recipients (Pro).
Read Receipts & Link Tracking - Tracks opens and clicks on sent emails (Pro).
Send Later & Reminders - Schedules emails and sets follow-up reminders (Pro).
Templates - Reusable email templates for frequent messages (Pro).
Activity Reports - Analyzes email patterns, open rates, and optimal send times (Pro).
Custom Themes - Supports dark mode and multiple built-in themes.
Keyboard Shortcuts - Advanced shortcuts for efficient navigation and actions.

Pricing

Plan	Price	Includes
Free	Free	Core features like unified inbox, search, mail rules, spell check; limited Pro feature trials.
Pro	$8/month	Read receipts, link tracking, send later, reminders, templates, contact profiles, analytics.

Platforms & Requirements

Runs natively on macOS, Windows, and Linux with ~50% less RAM than comparable clients and under one-second launch time. Uses a C++ sync engine for performance. No mobile or web versions; requires IMAP/SMTP setup and initial mailbox caching time based on message volume.

Integrations & Ecosystem

Gmail
Office 365
iCloud
Outlook.com
Yahoo
FastMail
Any IMAP/SMTP
Gmail labels support

Alternatives

App	Difference
Thunderbird	Fully free and open-source with broader extension ecosystem but less modern interface and no built-in tracking.
Spark	Focuses on team collaboration and AI features; available on mobile but Pro tracking requires subscription like Mailspring.
Apple Mail	Pre-installed on macOS with basic features; lacks unified inbox across all providers and advanced tracking.
Outlook	Microsoft ecosystem integration with calendar sync; heavier resource use and tied to subscription for full features.

Reputation

Mailspring is recognized for its speed, low resource usage, and modern features in a native desktop app, appealing to power users seeking alternatives to webmail or heavier clients. Criticisms include the required Mailspring ID creation, limited free Pro trials, and past reliability issues addressed in 2025 updates. Some users note contact profiling as intrusive, though disableable.

Sources (9)