OpenFahrtenbuch: Mileage Log

Trips via GPS or OBD adapter

Only for iPhone

Free · Designed for iPhone. Not verified for macOS.

iPhone

Open source: record trips with GPS or OBD, every change logged tamper-evident, PDF ready for the tax office. 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.

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    Information

    Seller
    Codext GmbH
    Size
    44 MB
    Category
    Business
    Compatibility
    Requires iOS 16.4 or later.
    • iPhone
      Requires iOS 16.4 or later.
    • Mac
      Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Location
    This app may use your location even when it isn’t open, which can decrease device battery life.
    Languages
    English and German
    Age Rating
    4+
    Copyright
    © 2026 Codext GmbH
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