Your chat app for the construction industry

The alternative to WhatsApp on the construction site

Geschäftsführer der Edlef Jensen GmbH schaut auf der Baustelle auf sein Handy
123erfasst: Baustellen-Apps für digitale Lösungen |

The advantages of the construction chat

Not every messaging service is suitable for business chatting in terms of data privacy compliance. So that you can exchange information securely, quickly and informally with your customers, colleagues and subcontractors, we have integrated a chat feature into our 123onsite construction site app for all users of the cloud solution.

Easy to use

Communicate efficiently

Use mobile on the construction site

123erfasst: Baustellen-Apps für digitale Lösungen |
123erfasst: Baustellen-Apps für digitale Lösungen |
123erfasst: Baustellen-Apps für digitale Lösungen |
123erfasst: Baustellen-Apps für digitale Lösungen |
123erfasst: Baustellen-Apps für digitale Lösungen |

What the DSGVO-compliant messenger for construction sites can do

The chat histories are saved in real time. The server is located in a German data center and is therefore subject to German law and its high standards of data and consumer protection.

Mitarbeiter der Tell Bau GmbH mit der mobilen 123erfasst App auf seinem Handy

123erfasst: Baustellen-Apps für digitale Lösungen |

Always chat in the right group

When you set up a construction site in 123onsite, the system automatically creates a chat group for the site. Access is available to each employee assigned to this construction site.


Never miss a message again

Users receive a push notification in their 123onsite app on their smartphone or tablet as soon as there is a new post in the chat group.

Mitarbeiter der Tell Bau GmbH mit der 123erfasst App

123erfasst: Baustellen-Apps für digitale Lösungen |


Inform everyone in the office too

With 123onsite you get the construction chat in real time also in the office version on your computer, so that everybody is really informed.


Access to all chat histories at any time

The entire chat history is saved and can be accessed from anywhere at any time. In addition, you can see who wrote which message. Once the construction site is complete, the chat remains stored and accessible in the Office version of 123onsite.

Kranführer von der Baugeschäft H & M GmbH auf der Baustelle mit seinem Handy

How you benefit from our construction chat


Mobile on the construction site

The chat solution allows for a quick exchange of information between all stakeholders on the construction site as well as with the office.


Legally compliant chatting

No more communication via text message or WhatsApp that is questionable from a data protection point of view. We offer you a secure chat alternative that also allows message archiving.


Efficient communication

The chat integrated in 123onsite is the appropriate communication channel for exchanges on the construction site – fast, simple and clear.

Start directly with the WhatsApp alternative for construction

Construction chats are available in every 123onsite module. For a secure and uncomplicated exchange with clients, colleagues or subcontractors.

123erfasst: Baustellen-Apps für digitale Lösungen |
123erfasst: Baustellen-Apps für digitale Lösungen |



Create tickets for tasks or defects and locate them on the stored plans. You always have your documentation at hand. Digitally and mobile via app.

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Thomas Gröne Koordinator bei Emil Tepe GmbH
Emil Tepe Logo

Thomas Gröne

Coordinator Emil Tepe

The ability to digitally process all data recorded with 123onsite on a site-by-site basis gives us significant advantages in the office

Emil Tepe GmbH

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Paperless in the office –
start now for free

123erfasst: Baustellen-Apps für digitale Lösungen |

It’s simple: Through our apps, you reduce the effort of your data entry, have an overview at any time during your project and can check your calculation afterwards.
Even easier: With us you save time and money.


Sign up for 123onsite for free


Enter your company and your employees


Collect data and enjoy your digitized construction site

Things to know about the chat app for construction


Blog articles

Did you know? 123onsite is available in seven Eastern European languages (Bulgarian, Croatian, Polish, Romanian, Russian, Czech and Ukrainian).


123onsite projects

The projects module manages and documents all information on subcontractors, services, material, daily wages, weather and contacts – digitally and mobile!


Success story

Straightforward communication thanks to construction chat – above the rooftops of Germany thanks to 123onsite.

Ask us your questions about our construction chat