Best Unipile Alternatives & Competitors in 2025

Nylas Mail Lives is a fork of Nylas Mail.

Key Nylas Mail Lives features:

Open Source Extensible Cross-Platform Modern User Interface

EmailEngine is an email client but for apps, not people. It connects to the user's email server, translates REST API requests from the app to IMAP and SMTP commands, and sends webhooks for changes like new or deleted emails.

Key EmailEngine App features:

Ease of Integration Unified API Real-time Email Processing Comprehensive Documentation

Open Source paid Free Trial $995.0 / Annually (Unlimited self hosted instances)

Seamless project management and collaboration for your team.

Key Hive features:

Free Trial Integrations File sharing Easy to Set-up and use

Visit website $12.0 / Monthly (Per user)

The Nylas Cloud API powers your application with email, calendar & contacts features. Built-in features for better email, calendar, and contact management.

Key Nylas Mail features:

Unified Inbox Customizability Built-in Analytics Developer-Friendly

Your email with an assistant built in.

Key Edison Mail features:

User-friendly Interface Unified Inbox Intelligent Features Privacy Protection

Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.

Key Microsoft Outlook features:

Integration with Microsoft Ecosystem Calendar and Task Management Strong Security Features Customizable Interface

Unprivileged sandboxing tool.

Key Bubblewrap features:

Security Isolation Lightweight Flexibility

Guides to generate revenue for your business on LinkedIn.

eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat. .

Key eM Client features:

Email Calendar Task management Events

freemium

Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!

Key Thunderbird features:

Free and Open Source Customization Cross-Platform Robust Security

Geary is an email application built for GNOME 3.

Key Geary features:

User Interface Integration Conversation View Lightweight

Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues.

Key Spark Mail features:

Smart Inbox Collaborative Email Customization Unified Inbox

Open Source

Get paid to build what you love on GitHub.

Key GitHub Sponsors features:

Financial Support Community Engagement Visibility and Promotion Flexible Sponsorship Options

The Bat! is a secure desktop email client for Windows, designed to protect your correspondence against third-parties and to save your time.

Key The Bat features:

Security Versatile Filtering System Advanced Automation Robust Backup & Restore