Introduction

Fieldbook is an offline-first HAM radio logging platform for desktop, tablet, and mobile.
It’s installable as a Progressive Web App (PWA), and every feature - logging a contact,
browsing a logbook, importing an ADIF file - works with no network connection at all. When
you’re back online, anything you did offline syncs to your account automatically.

This site covers what Fieldbook does and how it’s built:

  • Features - what you can do with it today.
  • Architecture - how the frontend, API, and offline sync are put
    together under the hood.

Why offline-first?

Amateur radio operating happens in places internet connectivity often doesn’t: field days,
SOTA/POTA activations, contest weekends in a basement shack with patchy Wi-Fi. A logger that
stops working the moment you lose signal isn’t a logger you can rely on in the field - so
Fieldbook is built around a local-first data model (see Offline sync)
where the network is an optimisation, not a dependency.

Next Features