True time, honestly measured.

Off the network, on site

Checking or setting the clock on offline OT equipment usually means trusting whatever the nearest laptop says. RTUs, PLCs, data loggers, protection relays, and survey instruments often sit on an isolated network, or on none at all.

On Android, TrueNTP reads time straight from the GPS satellite clock (pro), an independent reference that needs no network connection at all. Civil engineers, surveyors, substation and plant technicians can carry one honest number into the field and compare it against whatever the device in front of them believes.

For people who care what time it actually is

Network admins, sysadmins, cell techs, and the incurably precise. TrueNTP cross-checks Apple, Cloudflare, NIST, and Microsoft against each other, weights each answer by network quality, rejects outliers, and tells you its uncertainty instead of pretending there is none.

Highlights

• Hero clock: corrected true time ticking smoothly, anchored to the monotonic clock so OS clock steps can't fool it.
• Device drift: how far ahead or behind your clock really is, from a 1/RTT-weighted multi-server offset.
• Per-server detail: stratum, offset, round-trip time, raw NTP fields, and per-sample scatter.
• Offset history: a rolling timeline of your clock's behavior.
• GNSS cross-check (pro, Android): reads time straight from GPS satellites as an independent, offline-capable reference.