Frequently asked questions
If a user behaves inappropriately in your eyes (e.g. by using a criminal display image or inappropriate behaviour, etc.) you can report them by clicking on the profile picture of the user you wish to report. Go to the three-dot menu at the top right and click on Report user.
PLEASE NOTE: Reporting a user is only for the protection of other users and should only be done in the case of inappropriate behaviour. The evaluation of the driving performance or other aspects of participating in a carpool can be done via the star system.
To finalise your registration, we will send you an email with a verification link. To form carpools, you will also need to verify your phone number, which you will receive by text message.
It may take a few minutes to be sent. Please wait about 10 minutes and then check your inbox again. Also check your spam folder. Please note that (if you click several times) only the last e-mail or SMS sent is valid.
If you have not received an e-mail or SMS after 10 minutes and there is nothing in your spam folder, please contact us by e-mail at
Did you spell “ummadum” correctly?
If that wasn't the problem, it may be because ummadum is not yet available in your country. Currently, you can use ummadum in Austria, Switzerland, Germany, and Italy. Please try the following steps to check which country your app store is set to:
- Android:
- Go to the Google Play Store
- Select in the menu
- Tap on Settings
- Tap on General
- Tap on Account and device settings.
Here is the link that will take you directly to the ummadum app in the Play Store: ummadum Play Store
In the “Country and profiles” section, you can see which country is specified there. Instructions for changing the country: https://support.google.com/googleplay/answer/7431675?hl=de
- iOS:
- Open the App Store
- Select your name in the menu
- Tap on Country/Region
- Tap on Change country or region
- Here is the link that will take you directly to the ummadum app in the App Store: ummadum App Store
There is a tick next to the country for which your App Store applies.
Instructions for changing the country: https://support.apple.com/de-de/HT201389
You can access the terms and conditions via this link: https://www.ummadum.com/de/nutzungsbedingungen
In order to reward you for your climate-friendly activity and determine how much CO₂ you have helped to save, we need to make sure that the activity took place as you specified. To do this, we need your location and your movement data.
To make it easier for people who want to ride together to find each other at the meeting point, we will show you each other's locations. This can only be done if you share your location.
The free additional insurance for car pools only applies if there is a GPS signal for the duration of your journey together.
All data is only processed to the extent that it is necessary for the use of the app. You can find more information in the General Terms and Conditions.
The driver and passenger can contact each other in the app by phone or text message. For security reasons and to protect the privacy of our users, this is only possible for a limited period of time before, during and after the journey.
At ummadum, anyone can ride with anyone. Regardless of whether they work in different companies or live in different municipalities. The only decisive factor is whether part of their route overlaps.
For optimal matching, we take into account the date and time and whether the start and destination addresses are within a radius of 3 kilometres.
For example, if your company has a community, it often communicates this by means of posters, flyers or by email. A QR code or an invitation code can be found on these information sheets.
To scan the QR code, simply follow these steps:
- Open the ummadum app
- Tap on “Communities” in the bottom bar
- Tap on “Find via code”
- Tap on “Scan QR code” at the bottom
The ummadum app will now ask you to give it access to your camera
- Tap either “When using the app” or “Only this time” to access the camera
- Now hold the QR code in front of your camera so that it fits into the frame.
If everything has worked, you should now land on the community page in the app. Here, you can see an overview of the most important information and benefits that you receive as a community member.
- Tap on the green “Join” button to join the community
To join a community, you must agree to its terms of use. The terms and conditions may vary depending on the community.
If the QR code is invalid, please contact our customer support team by email at
For example, if your company has a community, it often communicates this by means of posters, flyers or by email. A QR code or an invitation code can be found on these information sheets.
You can find out where you can enter the invitation code here:
- Open the ummadum app
- Tap on “Communities” in the bottom bar
- Tap on “Find via code”
- Tap on the text field in the centre and enter the 7-digit invitation code
If everything worked, you should now land on the community page. Here, you can see an overview of the most important information and benefits that you receive as a community member.
To join a community, you must agree to its terms of use. The conditions of membership may vary depending on the community.
If the invitation code is invalid, please contact our customer support team by email at
If you are unable to join a community, there may be various reasons for this. Company communities, for example, are exclusively for employees, which is why you may be asked for a personnel number to join.
If you believe that you are eligible to join a community, you are welcome to contact our support team. Simply email
The availability of communities depends on various factors, such as demand and the interest of people in a particular region. We are constantly working to expand the range of communities on offer. Perhaps you can ask your municipality or employer in your region whether they would also like to join ummadum and set up a community.
You can contact us via the following links:
If you have been removed from a community, there may be various reasons for this. For example, because you have entered an incomplete or incorrect name.
Please contact Customer Support and simply email
To join a community, simply follow these steps:
- Open the ummadum app.
- Tap on "Communities" in the bottom bar.
- Search for the community by either entering the name or scanning the QR code or entering the 7-digit invitation code.
- When you have found the community, tap on "Join".
- Read and accept the terms of use of the community.
Congratulations! You are now a community member!
Bear in mind that each community may set its own entry requirements (e.g. employees must provide their ID number for verification).