OpenFahrtenbuch: Mileage Log

Codext GmbH

About this app

The free mileage log for freelancers, company car drivers and everyone who wants to get rid of the 1% rule in Germany. No subscription, no plug, no account. Open source.

THREE WAYS TO RECORD
• GPS in your phone: tap "Start trip" and the phone measures the distance, even when you leave the app. Start and destination addresses are filled in automatically.
• OBD adapter (optional): a low-cost Bluetooth LE adapter (ELM327) reads the real odometer from the car and starts and stops trips on its own.
• By hand: enter odometer, destination and purpose yourself, like a paper logbook.

BUILT TO THE GERMAN TAX OFFICE REQUIREMENTS
• Date, time and odometer at the start and end of every trip
• Business trips with destination, purpose, business contact and route for detours
• Private trips and commutes with kilometres and a note
• Reminders for the 7-day rule, late entries are marked
• Trips lock after 7 days and can never be deleted, only voided
• Every change is recorded in a tamper-evident SHA-256 hash chain and printed in the PDF next to the trip, with date and original value
• Odometer gaps are shown right away

EXPORT
• PDF mileage log for the tax office and your accountant
• CSV for Excel, DATEV and machine evaluation
• Full backup including the change history, verified before it can be restored

HANDY
• Places like home, office and clients fill in destination, purpose and contact automatically
• Multiple vehicles and drivers
• Cost log and 1% rule vs logbook method comparison
• Light and dark mode, German and English

PRIVACY
No account, no server, no ads, no tracking. All data stays on your phone. Location is only used while a trip is recording.

Note: the German tax office does not certify any logbook software. Whether a logbook is accepted depends on your entries. This app is not tax advice.

Source code: github.com/codextde/openfahrtenbuch
Made by Codext GmbH.

What’s new

First release: trips via GPS, OBD adapter or by hand, tamper-evident history, PDF and CSV export.