Local is the source of truth
QSOs, parks, summits, and radio state live on the device. The cloud is a replica, not a dependency.
Offline-first
A ham radio logbook that does not need the internet.
Field ops die when the logger depends on a tower. Log73 writes every QSO to encrypted local storage, keeps recovery snapshots, and syncs when you decide — not when the network decides.
Recovery snapshots
Point-in-time log images survive app kills, dead batteries, and the ‘I dropped it in the creek’ moment.
Conflict-aware sync
Two devices, one activation: last-write with QSO identity, not a silent overwrite.
EMCOMM ready
Emergency nets do not wait for a captive portal. The log, the roster, and the clock keep running.
Questions
Where is my log stored if I am offline?
On device, in encrypted local storage, with periodic recovery snapshots. Nothing required from a server to write or read a QSO.
Can I export without signing in?
ADIF, CSV, and Cabrillo export from the device. Cloud is optional.
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Log73 · Offline-first · Field trial · Offline-first tactical logging