TrueNTP

About TrueNTP

Your phone's clock lies to you a little. TrueNTP tells you by exactly how much.

TrueNTP queries multiple independent time servers — Apple, Cloudflare, NIST, and the NTP Pool — cross-checks their answers, and computes true time with millisecond precision. The result is a clean instrument panel showing corrected true time, your device clock's real drift, and an honest uncertainty bound instead of false precision.

BUILT FOR PEOPLE WHO CARE WHAT TIME IT ACTUALLY IS
Network admins verifying NTP infrastructure. Cell techs checking tower timing. Sysadmins chasing certificate and Kerberos clock-skew errors. Or anyone who wants their five seconds back.

HOW IT MEASURES
• Bursts of SNTP samples to every active server, weighted by network quality (1/RTT)
• Per-server offset, round-trip time, and stratum at a glance
• Optional outlier rejection against the cross-server median
• Leap-smearing servers (Google, Amazon) kept out of the average unless you say otherwise
• An uncertainty readout that tells you how much to trust the number

WHAT YOU SEE
• Hero clock: corrected true time, ticking smoothly, immune to OS clock steps
• Device clock card: your clock's drift, labeled plainly — DEVICE AHEAD, DEVICE BEHIND, or IN SYNC
• Server list with per-server detail sheets: refid, root delay, root dispersion, per-sample scatter
• 30-minute offset timeline showing your clock's behavior
• GNSS cross-check (Pro, coming soon): read time straight from GPS satellites as an independent reference that works with no network at all

HONEST BY DESIGN
No accounts. No analytics. No tracking. Settings and history stay on your device. The full privacy policy is one page and you can read it in under a minute.

Plain-language NTP guide included: stratum, offset, RTT, smearing, and why wifi beats cellular for time sync — explained without jargon.