mantau is:

Secure messenger to chat, discuss and inform  

In the group, in dialogue, in the newsletter

Good communication is the key to success. mantau as a secure messenger supports the exchange of messages in the group, in personal one-on-one chats or in newsletters in a simple way. Multi-device: via app on mobile devices - or via desktop computers.

Much more than just a messenger app

The messaging function alone can be used in many ways. The chat content is transmitted according to the highest security standards. All connections are TLS-encrypted, all data is stored exclusively in a German, certified data centre - and there on hardware-encrypted data carriers. 

All mantau features at a glance

Individual chat - for dialogues in one-on-one

mantau enables one-on-one chats, as you are used to from conventional messengers.

Networking is done simply by invitation. Starting a chat with other mantau users, especially with participants from shared groups, is child's play.

Group chats - cleverly organised

With mantau, you bring groups, teams, departments, committees together in an orderly manner for message exchange. Via app on mobile devices - or via desktop computers. 

Thanks to structuring according to members - or simply according to topics or projects - all participants retain an overview at all times. This makes it possible to chat in a topic- and context-related manner.

Group administrators determine who may write in the team chat, i.e. who has author's rights, or who may only read.

Ideal for "personnel changes" or new members: New participants in the group always see the complete message history - and can "read in".

Write messages

Messages are written in the same way as in e-mail programmes and messengers. Of course, it is easiest to use on a desktop computer or notebook.

Graphics and photos can be sent either compressed or in their original size as attachments - and can also be stored in the shared data box at the same time.

Subject line and reference as needed

The possible subject line as well as answer options with reference help with the thematic classification.

Who reads? Who does not? Edit messages afterwards

In mantau, it is easy to see who has already read the message and who has not yet.

In addition, a message can be edited by the sender, e.g. to correct mistakes. This is also comprehensible for every member in the detailed information.

Send newsletter by messenger

In mantau, members can be added to a group anonymously, i.e. not visible to other members. This is comparable to hidden recipients when sending e-mail ("bcc").

Hidden recipients are read-only in the group and can only contact moderators.

This makes mantau ideal for sending newsletters or member or community information - right up to support services of various kinds.

Advantages over the conventional e-mail newsletter:

  • Simple invitation to a distribution list
  • simple "unsubscribe" by recipient
  • better awareness through notification
  • secure platform, no address abuse, no SPAM
Get started now

And this is how it works! Organise your groups easily with mantau.

mantau is simple and intuitive to use. Step by step we guide you along the setup.

Get started now

Use on every device you have - at the same time!

Available wherever the features are needed at the moment.

All groups and content are available everywhere and synchronously on all devices where you have mantau installed. Ideal for quick messaging on the way - as well as longer texting when using a computer. Ideal for hybrid work environments.


Mobile App

For smartphones and tablets with iOS from version 14


Mobile App

For smartphones and tablets with Android version 8.0



For Windows, macOS, ChromeOS with common browsers/PWA

Mareike Grund

Your contact for all questions

Mareike Grund

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