Prime Time NTP
Atomic Clock Precision for iOS
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Pro features now available — manual sync, always-on display & up to 30 NTP servers. See the true time, down to the millisecond.
"PrimeTime" is a high-precision time app that lets you check the extremely accurate time down to the millisecond.
By sending queries directly to multiple NTP servers, it reveals the "true current time" that standard clock apps cannot display. It accounts for network latency to provide precisely synchronized time in real-time.
[Features]
• Real-time NTP sync with up to 5 servers (free)
• Millisecond-precision display at 120fps
• Network offset and RTT (round-trip time) monitoring
• Sparkline graphs for offset and RTT history
• Stratum and reference ID display per server
[Pro Features — one-time purchase]
• Manual sync on demand
• Always-on display while app is open
• Monitor up to 30 NTP servers simultaneously
Perfect for developers, network engineers, or anyone curious about the true accuracy of their device's clock.
• Added Pro features (one-time purchase): manual sync, always-on display, up to 30 NTP servers
• UI improvements
The developer, Kentaro Saito, 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
- Seller
- Kentaro Saito
- Size
- 1.8 MB
- Category
- Utilities
- Compatibility
Requires iOS 26.2 or later.
- iPhone
Requires iOS 26.2 or later. - iPad
Requires iPadOS 26.2 or later. - Mac
Requires macOS 26.2 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Premium Features $9.99
- Copyright
- © 2026 Kentaro Saito