Tuta Mail is described as 'End-to-end encrypted app for email, calendar, and contacts, requiring no personal data, with open source code and quantum-resistant security' and is a leading webmail provider in the office & productivity category. There are more than 100 alternatives to Tuta Mail for a variety of platforms, including Web-based, Android, iPhone, iPad and Mac apps. The best Tuta Mail alternative is Proton Mail, which is both free and Open Source. Other great apps like Tuta Mail are Proton Calendar, Disroot, Posteo and mailbox.
Secure Exchanges is a SaaS that enables point-to-point encrypted email exchange without the recipient having to install anything. It allows you to send emails and files up to 2.5 G. It also allows you to receive information.
Forward Email is the best email service, encrypted email service, and fastest email service. It supports unlimited domains and aliases for no extra cost. It uses quantum safe ChaCha20-Poly1305 encryption and offers SMTP, IMAP, POP3, email webhooks, email regular expressions...
Runbox offers email hosting, domain hosting, and web hosting services, as well as custom-made email solutions
Amie is a productivity application that facilitates task, event, and contact management, integrating a scheduling feature for task and event time allocation, and effectively transforming the calendar into a todo list, with color-coding for improved organization and visual...
StayPrivate email encryption ensures that important emails, files and notes stay secure, stay compliant and stay private.
Soverin is an independent private company based in Amsterdam, run by a team of internet enthusiasts who want to create great products that are safe, beautiful and easy to use. We’re passionate about changing the status quo and actively want to raise awareness about digital...
HEY Calendar is a digital scheduling tool designed with a unique approach to managing time and tasks. It offers a feature that allows users to rename days according to their significance, such as designating a day as 'Travel day', 'Anniversary', or 'No work...
Lockbin is a web application for sending private email messages and files. People use it to send things like credit card numbers or confidential information.
OnionMail is an anonymous and encrypted mail server made to run on the TOR network without losing the ability to communicate with the Internet.
MeSign is a free email encrypted client. Once you log in to your email account with MeSign App, the free S/MIME certificates will be issued, installed and configured automatically. The users can start to encrypt within 3 minutes.
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Tutanota is a webmail service that gives you easy-to-use encryption. Mynigma is an email client (not service) for Mac/iPhone/iPad and it's not open source. In that sense, not really a replacement.