Book your train, bus and carpool tickets.

Often almost nothing, and sometimes even zero. Many employers, regions and local authorities subsidize commuting trips: in these cases, the passenger pays a symbolic amount and the driver receives a fee for each trip.

Without a subsidy, the price stays as low as possible: a few euros for a typical 20 to 30 km trip, split between fuel costs and vehicle wear and tear.

Check in the app whether your employer or your local authority takes part in the scheme — the difference can be considerable.

It all depends on the distance and frequency. For a Paris-Lyon trip next weekend, it's BlaBlaCar. For getting to the office every morning, it's Daily.

The two apps are separate, with separate accounts, but the logic remains the same: sharing the cost of a car trip. Daily adds recurrence (your trips reschedule themselves) and employer subsidies, two things that don't exist in the long-distance version.

And for your occasional longer trips, remember to compare carpooling with train and bus on Tictactrip: depending on the destination, the bus is sometimes cheaper than the share of fuel costs.

BlaBlaCar Daily is carpooling for everyday commutes. You enter your address, your workplace and your usual hours, and the app suggests drivers or passengers making the same route as you, at the same times.

No need to plan everything the night before: trips can be booked in a few seconds, and regulars often end up carpooling with the same people every week. Payment goes through the app, just like on BlaBlaCar.

The app is designed for distances of 10 to 40 km. Beyond that, head to classic BlaBlaCar.