Unipile Alternatives

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

Open Source

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.

Open Source paid Free Trial €795.0 / Annually (Unlimited self hosted instances)

Optimize your schedule with custom booking pages and calendar integrations

Try for free freemium $29.0 / One-off ($29 one-time paymnet)

Your email with an assistant built in

Airmail is a lightweight and lightning fast mail client for Mac.

Flexible, RESTful access to the user's inbox

Get paid to build what you love on GitHub

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

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.

freemium

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

PayPal is the faster, safer way to pay online without sharing financial details, send and receive money or accept credit and debit cards as a seller

Pro developers get assurances. OSS maintainers get paid.

Privacy-aware email app for Mac & iOS

BlueMail is an email management app for Android, iOS, and Windows.