goFLUX is now Karos
Neuer Name, neue App.
Alles andere bleibt gleich.
goFLUX is now Karos
Karos app on a smartphone

Find your everyday carpool to work. Save money. Arrive reliably.

Ride with trusted drivers and passengers on your daily route. Drivers receive a cost contribution, passengers save time and money.
Download on the App StoreGet it on Google Play
Rated 4.8 out of 5
on
AppStore
White compact car parked on a city street with buildings and trees in the background.
Smiling woman with long brown hair holding and interacting with a smartphone.
Profile showing a man named Pierre C. labeled Connaisseur with link for passenger or driver.
Profile photo of smiling woman Aurélie F., labeled Expert and Conducteur in French.
Profile card showing a man named Régis T., Novice with a conductor role and a crown icon above Novice.
App screen showing route from home to work with user photos and a pink start button labeled Démarrer.Five-star user review: “Great trip, thanks!”

One app.
Two ways to save.

Passenger
Get to work for less
Find reliable rides on your regular route
Save on commuting costs every day
Subsidised rides in partner areas
Smiling man using the Karos app on his phone
Driver
Earn by sharing your empty seats
Share trips you already take
Get compensated for your everyday commute
Reduce fuel costs with every passenger
Smiling woman using a smartphone

Even stronger with your employer or region.

Check if your region or employer is already working with Karos, and profit from:
Subsidies for your commuting costs
Mobility solutions integrated with your public transport
Higher ride density and better matching
Karos app co-branded with hvv (Hamburg)Karos app co-branded with MarseilleKaros app co-branded with traffiQ (Frankfurt)Karos app co-branded with Île-de-France MobilitésKaros app co-branded with MVG (Munich)Karos app co-branded with Brainport (Eindhoven)Karos app co-branded with hvv (Hamburg)

Smart matching for daily carpooling routines

Karos combines a user-friendly carpooling app with a powerful matching algorithm.
Smartphone screen showing a KAROS app ride-sharing interface with driver options and meeting times.
Daily carpooling, matched to your routine
AI-powered route optimisation
Door-to-door suggestions
Flexible departure windows
QR code to download the Karos app
Download on the App StoreGet it on Google Play
4.8/5
on
Scan or click QR-code to download Karos for free
Rated 4.8 out of 5
on
AppStore
Download the Karos-app for free.
Download the app for free
Download on the App StoreGet it on Google Play
Rated 4.8 out of 5
on
AppStore
QR code to download the Karos app
Karos app on a smartphone

Your Karos-app features for carpooling safely and with ease

Return assistance

Your return carpool was cancelled at the last minute? Don’t worry — Karos makes sure you still get home safely.

Learn more
Return assistance

Verified profiles

Carpool with confidence: verified profiles and post-trip ratings help create a community you can trust.

Download the App
Karos app screen: verified profile

Flexible carpooling

Carpool your way: choose who you travel with, switch between driving and riding, and adapt every trip to your plans.

Download the App
Karos app screen: flexible carpool schedule

Women-only carpooling

Choose what feels right for you. With the women-only filter, you can match exclusively with other women.

Download the App
Karos app screen: women-only carpooling filter

Invite people you know

Already know who you want to carpool with? Invite colleagues, friends or favourite carpool partners directly in the app.

Download the App
Karos app screen: invite people you know

Carpool to campus with your student community

Karos works with campuses and student associations to make daily rides to school easier, cheaper and more reliable. Students can join their school community in the app to find classmates on the same route, build your carpool crew, and coordinate rides easily. Depending on your city, region or campus partnership, rides can also be supported with local incentives.
Find drivers and passengers from your campus community
Save money as a passenger, earn as a driver
Invite friends and benefit from the referral program
Map of Germany with marked major cities connected by blue radial network lines.Smiling woman holding coffee cup in passenger seat and man in green shirt driving a car.Smiling woman and man sitting in a car, with the man driving and sunlight outside.

Your commute. Bigger impact.

Reduce your CO2 emissions and support local climate goals
Meet colleagues and new people on your daily route
Reduce solo driving and save costs with every shared ride

What our users/ carpoolers? say

“I earn about €50 a month thanks to carpooling. It covers almost all of my fuel expenses for the month!”
Raffaela
Driver from Frankfurt
“Previously, using public transport took me almost two hours to get to work; now it only takes 30 minutes. Thanks to Karos, I have not only saved time and money but also built a genuine network—both professionally and personally. And thanks to the savings, I was even able to afford my own car later on.”
Alexandre
Driver & Passenger from Toulouse
Smiling man and woman sitting in car looking at a smartphone.
4,8⭑
Average community grade
“Initially, I was skeptical about traveling with strangers. Today, I take someone along once a week, whose access to work depends entirely on this ride. This shows me that carpooling creates mobility, trust, and real participation.”
Manon
Driver from the Rhone
“What started as a practical solution for my commute has become a genuine connection. Our rides are filled with conversations, advice and mutual support. To me, carpooling means turning daily kilometres into meaningful encounters.”
Veronika
Passenger from Hamburg
Two women smiling in a car
20k+
Shared daily rides

Frequently asked questions

Karos enables public authorities and employers to structure daily carpooling as a reliable mobility solution, fully complementary to public transport and designed to operate at territorial scale.
How do I get started with Karos ?

Getting started is simple: download the app, create your profile and enter your usual route. Karos will then suggest matches with other commuters travelling the same way, so you can start sharing rides right away.

Is Karos suitable for my daily home-to-work commute?

Karos is built for regular home-to-work commuting, including areas where public transport is limited. The more people join in your area, the easier it becomes to find a reliable match for your daily journeys.

Do I earn anything if I drive and share my rides?

Drivers receive a small fee per trip to help cover fuel and travel costs. It is a simple way to reduce your own commuting expenses by sharing rides you were already making.

How much does it cost to carpool as a passenger?

As a passenger, you typically pay a small contribution towards the trip, which is much cheaper than driving alone or other transport options. In some territories, local authorities subsidise rides, so your cost can be even lower.

How does carpooling with Karos work for me?

Karos matches you with people travelling along the same route at the same time, so you can share daily commutes easily. You can ride as a passenger or offer seats as a driver, meet people from your area and save on travel costs, all through the app.

Let's make carpooling a new standard of everyday commuting