TrueOffset
Precision NTP Clock
Free · Designed for iPad. Not verified for macOS.
New: the TrueOffset Master Clock. A tick every second and a voice reading local and Universal Time, in tribute to the U.S. Naval Observatory's telephone time service.
TrueOffset is a precision time utility for comparing time sources and measuring clock offset with clarity and confidence.
Compare multiple Network Time Protocol (NTP) servers, visualize the difference between them, and see how your device's clock aligns with selected references. A clean, instrument-style interface presents time as a measurement—focused on accuracy, not decoration.
FOUR CLOCK FACES
- 12-Hour Classic — Traditional analog display
- 24-Hour Scientific — Full day on one dial
- NTP Offset — Dual second hands show device vs. true time
- Digital — Large display with millisecond precision
UTC & TAI TIME SCALES
Display Coordinated Universal Time (UTC) and International Atomic Time (TAI) alongside your local time. UTC and TAI feature authentic deadbeat second hands that step crisply to each second, visually distinct from the smooth-sweep local time. TAI runs 37 leap seconds ahead of UTC—see both atomic time scales at a glance.
TIME SIGNALS
Hear the true second. Optional pips are timed against your NTP reference, so the start of each one marks the real second, not your device's idea of it. Choose from six classic signals synthesized to their published pitch and timing: Six Pips (Greenwich Time Signal), WWV, WWVH, CHU, Jihō, and Moscow Six Pips. Sound them on the hour, every 15 minutes, or every minute. Bluetooth or AirPlay speaker running late? Measure its delay with the microphone and TrueOffset compensates.
TRUEOFFSET MASTER CLOCK
Our tribute to the U.S. Naval Observatory's telephone time service. A tick sounds every second while a voice announces your local time and then Universal Time, each ahead of a beep that lands on the true second. Prefer it quiet? Switch the voice off and keep the ticks. TrueOffset is not affiliated with the U.S. Naval Observatory.
PRECISION VISUALIZATION
The NTP Offset view displays two second hands: your device clock (gray) and true NTP time (green). The offset magnifier shows drift on a ±10ms scale, so you can see sub-millisecond accuracy at a glance.
DUAL-STACK COMPARISON
A feature no other NTP app offers: compare IPv4 and IPv6 paths to the same server. Detect DNS misconfigurations, identify when address families route to different servers, and verify your network is delivering consistent time on both stacks.
FLEXIBLE TIME SOURCES
Compare against Apple, Google, Cloudflare, NIST, US Naval Observatory, global NTP pools, or add your own servers. Set any source as your reference and track offsets across all configured servers.
QUALITY ANALYTICS
Eight swipeable chart pages reveal the character of your time sources:
- Dashboard — Sparkline overview of all servers
- Offset History — Track drift over time
- Histogram — Offset distribution analysis
- Box Plot — Compare consistency across servers
- RTT Scatter — Correlate latency with offset
- Clock Sources — Decode reference clocks (GPS, PPS, Rubidium, Cesium)
- Dual-Stack — IPv4 vs IPv6 path comparison
- Rankings — Servers scored by jitter and round-trip time
TrueOffset is designed for users who care about how accurate their time really is—and want to see the difference, not just trust it.
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In appreciation of Emerald Sequoia's Emerald Time.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
TRUEOFFSET MASTER CLOCK
A tribute to the U.S. Naval Observatory's telephone time service. A tick sounds every second while a voice reads the time: "At the tone, Pacific Daylight Time, 14 hours, 32 minutes, 15 seconds." Five seconds later it does the same for Universal Time. Each beep lands on the true second, timed against your NTP reference rather than your device clock.
- Turn it on in Settings > Sound > Time Signal
- Announces your local time and Universal Time every 15 seconds
- Switch Voice Announcements off to keep just the ticks and beeps
- Speaks English with your device's voice; Enhanced and Premium voices sound more natural
TrueOffset is not affiliated with the U.S. Naval Observatory.
NEW IN 1.2, IN CASE YOU MISSED IT
- Time signals: Six Pips (Greenwich Time Signal), WWV, WWVH, CHU, Jihō, and Moscow Six Pips, synthesized to each service's published pitch and timing
- Measure with Microphone: finds the delay your Bluetooth or AirPlay speaker adds and starts each pip that much earlier
- Initial support for iPhone Duo
The developer, Richard Bollar, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Size
- 2 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.6 or later.
- iPhone
Requires iOS 17.6 or later. - iPad
Requires iPadOS 17.6 or later. - Mac
Requires macOS 14.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.3 or later. - Apple TV
Requires tvOS 26.2 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Provider
Richard Bollar
- Richard Bollar has identified itself as a trader for this app and confirmed that this product or service complies with European Union law.
- Address
1321 Upland Dr
PMB 4390
Houston Texas 77043
United States - Phone Number
+1 8177989629 - Email
appstoreconnect@bol.la
- Copyright
- © 2026 Richard Bollar