RainLoop Webmail is a simple, modern & fast web-based email client. Developed by RainLoop
License: Open Source
Rainloop is a lightweight, customizable email client that supports multiple accounts and can be self-hosted, making it ideal for users who prefer control over their data. Inbox by Gmail, on the other hand, offers a user-friendly experience with powerful features integrated into the Google ecosystem, but lacks the customization and self-hosting options of Rainloop.