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Free
In-App PurchasesWith Ads
About
This utility app precisely measures and displays server clock times for time-sensitive events like ticket drops. It offers advanced features to correct for device drift and ensure accurate countdowns, even while using other applications.
✓Server clock synchronization
✓Millisecond precision countdown
✓Device drift correction
✓Picture-in-Picture mode
✓Haptic and sound alerts
✓Practice mode for timing
✓Supports over 300 time sources
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What's New in Atto
1.0.4
October 5, 2026
Starting is faster. • Tap Start in PiP and the ad plays right away, with no sheet in between; the PiP countdown begins the moment it ends • If no ad can be loaded, or within a minute of the opening time, the countdown starts without one so nothing gets in your way • Atto Pro always starts instantly, with no ads
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Subscriptions & In-App Purchases
$2.99
Atto Pro
Removes ads. Island and Lock Screen stay unlocked.
User reviews
Developer apps
FAQ
What is Atto's primary function?
Atto is designed to provide millisecond-accurate countdowns for time-sensitive events, such as ticket drops. It synchronizes with server clocks rather than your device's internal clock to ensure precision.
How does Atto achieve millisecond accuracy?
Atto probes server clocks at precise intervals and analyzes HTTP Date headers to calculate and display the exact offset. It corrects for device drift and filters out cached responses to maintain accuracy.
Can I use Atto while browsing other apps?
Yes, Atto features a Picture-in-Picture mode that allows a countdown window to float above other applications. This ensures you can keep track of time while navigating booking sites or other apps.
Does Atto have ads?
Yes, Atto contains advertisements. A rewarded ad can be watched to float a single countdown in a PiP window.
What are the pricing options for Atto?
The core features of Atto, including full sync accuracy, drift correction, and access to all time sources, are free. A one-time purchase is available to remove ads and unlock the Picture-in-Picture functionality permanently.
How often is Atto updated?
The latest version of Atto is 1.0.4, which was last updated on October 5, 2026. Updates typically occur to improve performance and add new features.
What devices does Atto support?
Atto is currently supported on iPhones. It is rated for ages 4 and up.
Can I add custom time sources to Atto?
Yes, in addition to over 300 pre-loaded sources, Atto allows you to type in any server address yourself to use as a time source.
