# Nanotime vs Atto

The clearest difference is review sentiment: Atto at 100% against Nanotime's 50%. Nanotime's advantage is monetization model (ad-supported vs free with in-app purchases) and update cadence (every 2 days vs every 4 days). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Nanotime sells 1 one-off in-app purchase and Atto sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Nanotime ships an update every 2 days, Atto every 4 days. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Nanotime | Atto |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 2 days** | Every 4 days |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 66 MB | 11 MB |
| Requires iOS | **16.4** | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Nemo factory](https://appshunter.io/developer/6781919423) | [Beomjin In](https://appshunter.io/developer/1791890813) |

## What reviewers say

### Nanotime

[App page](https://appshunter.io/ios/app/nanotime-server-time-clock/id6801582008)

This app displays the precise server time of ticketing and course registration websites in milliseconds. It directly queries the target site's server, accounting for network delays and server clock discrepancies. Get accurate countdowns and alerts for important events without relying on your phone's standard clock.

**Highlights:** Millisecond-accurate server time display, Direct server queries, no central server, Accounts for network delay and server clock drift, Supports over 1,200 pre-registered sites, Custom site input and favorites, Audio and vibration alerts for target times, Picture-in-Picture (PiP) mode for concurrent browsing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $3.99 | one-time |


### Atto

[App page](https://appshunter.io/ios/app/atto-ticket-drop-timer/id6811104130)

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.

**Highlights:** 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

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Atto Pro | $1.99 | one-time |


## Frequently asked questions

### Is Nanotime free?

Nanotime is free to download, with in-app purchases available.

### Is Atto free?

Atto is free to download, with in-app purchases available.

### Do Nanotime or Atto have ads?

Both Nanotime and Atto show ads.

### Which is updated more often, Nanotime or Atto?

Nanotime ships an update every 2 days, and Atto every 4 days. Most recently, Nanotime was updated on October 24, 2026 and Atto on October 25, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*