Great precision
Would love a feature that shows me the most accurate NTP server to best determine my device offset, based on the best quality (like RTT, etc.)
Free
In-App Purchases
About
This utility app displays the precise current time, accurate to the millisecond, by querying multiple NTP servers. It offers detailed insights into clock synchronization and network performance, with advanced features available via a one-time purchase.
✓Millisecond time display
✓Queries multiple NTP servers
✓Detailed sync accuracy
✓Network performance metrics
✓Adaptive polling
✓One-time Pro upgrade
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What's New in Prime Time NTP
1.4
October 22, 2026
Version 1.4 • Display Offset (Pro): run the large clock up to 99.999 seconds ahead of or behind real time, in 1 ms steps — for remote broadcasts, live streams, and other delayed feeds. While it is on, the time turns yellow, with the offset above and the actual time below. Measurements are never shifted. • Server details: two columns in landscape on iPhone, so everything fits on one screen. • On iPhone with ProMotion, the clock now refreshes up to 120 times a second. Requires iOS 26 or later.
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Subscriptions & In-App Purchases
$4.99
Pro Features
Up to 30 servers, manual sync, screen awake
User reviews
Developer apps
FAQ
What is Prime Time NTP?
Prime Time NTP is a utility app that displays the precise current time, accurate to the millisecond, by querying multiple NTP servers. It does not use your device's internal clock for the displayed time.
How accurate is Prime Time NTP?
The app aims for millisecond accuracy by querying NTP servers. It displays the device offset with its estimated ± accuracy, widening the margin on cellular connections where directions are less alike.
Does Prime Time NTP have ads?
No, Prime Time NTP does not contain advertisements. The app is free to use with optional Pro features available as a one-time purchase.
What are the Pro features in Prime Time NTP?
The Pro version, a one-time purchase, allows manual sync on demand, keeps the screen awake while the app is open, and enables monitoring of up to 30 NTP servers simultaneously.
What is the update frequency for Prime Time NTP?
The app was last updated on August 19, 2026, with version 1.2. Updates typically include improvements to NTP exchange processing, clock filtering, and interface enhancements.
Is Prime Time NTP available on all devices?
Prime Time NTP is available for iPhone and iPad devices. It supports iOS and is rated for ages 4 and up.
How does Prime Time NTP handle server selection?
The app uses a clock filter where each server keeps its last eight exchanges. It prioritizes the server with the lowest synchronization distance, not just the newest, and marks the best source with a green double ring.
Can I sync Prime Time NTP manually?
Manual sync on demand is a feature available in the Pro version of Prime Time NTP, which can be purchased with a one-time payment.
