# Millisecond Clock — The Most Accurate Clock

> Highly accurate clock app displaying time to the millisecond. (iPhone/iPad app by Chia-Chun Hsieh.)

- Source: https://appshunter.io/ios/app/millisecond-clock/id1526615560 (this page in markdown: same URL + `.md`)
- Developer: [Chia-Chun Hsieh](https://appshunter.io/developer/908221958)
- Category: Lifestyle, Utilities
- Price: Free with in-app purchases
- Rating: 4.70/5 from 130 App Store ratings · 11 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 4 MB
- Languages: American English, Japanese, Chinese (Simplified, China), Chinese (Traditional, Taiwan)
- Released: 2020-08-27
- Data updated: 2026-08-24
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/millisecond-clock/id1526615560/reviews.md

## What is Millisecond Clock?

Millisecond Clock shows the exact time down to 1/1000 of a second, accurate enough to measure real delay in cameras, video streams, and network connections.
Point a camera at the screen and compare it to another display: the difference in milliseconds tells you exactly how much latency you are dealing with.

Beyond precision, Millisecond Clock is a clock you can make your own. Every part of it, from color and font to position on screen, is yours to design.

DESIGN YOUR CLOCK- 13 built-in color themes, or create unlimited custom themes with the full color picker
- 30 fonts, from the classic digital LED look to elegant serif and rounded styles
- Adjustable glow and shadow effects for extra depth
- Drag the clock, date, and weekday anywhere on screen, and resize each one independently

STAY ON TIME, YOUR WAY- 12-hour or 24-hour time, with an optional blinking colon
- 9 date formats to match how you write dates
- Show or hide the date and day of the week
- Toggle the millisecond display on or off

BUILT TO STAY ON SCREEN- Keeps your screen awake so the clock is always visible
- A true universal app, designed for both iPhone and iPad

Millisecond Clock is free to use, supported by ads.
A one-time in-app purchase removes ads and unlocks every premium theme, no subscription required.

## Key features

- Millisecond precision time display
- Accurate timekeeping for iPhone and iPad
- Network delay measurement
- Video streaming lag analysis
- Free to download

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |
| Unlock Themes | $3.99 | one-time |
| Special Offer Package | $2.99 | one-time |


## Recent user reviews (10 of 11)

All indexed reviews: https://appshunter.io/ios/app/millisecond-clock/id1526615560/reviews.md

### 1/5 — Feedback

*2025-10-15, version 2.2.0*

Negativa

### 4/5 — Widget

*2024-09-02, version 2.2.0*

Will there ever be a widget

### 5/5 — Great clock

*2024-08-22, version 2.2.0*

I used to to time my watch up so now it’s to the millisecond and I tested this with iPhone alarm and other clocks it’s exactly right I totally recommend this plus the clock customization is always great!

### 5/5 — I r

*2024-04-13, version 2.2.0*

I

### 5/5 — Great App

*2024-03-09, version 2.2.0*

I love the milliseconds! It makes it very precise. Great selection of fonts!

### 5/5 — Best Timer Available

*2024-01-05, version 2.1.0*

Great timer with tons of customization. Blinking : is always present

### 5/5 — Does what it says

*2023-09-04*

Clean and simple!  Thank you!!

### 3/5 — Good try, but

*2023-05-28, version 2.0.1*

It’s a nice app. I upgraded to remove advs, but it did’t work. I used the restore purchases, but that didn’t work either. I feel like this is negative feedback … instead of a review. It would be nice if there was a widget, too. App dev is not easy … even with simple apps

### 4/5 — Precision of 0.017 seconds

*2023-01-26, version 2.0.1*

This app is helpful but a little misleading. The clock appears limited to 0.017 second increments, only slightly better than Apple’s stopwatch app. Slo-mo video on the iPhone can capture at 240 fps, which would be 0.004 second precision. Filming this clock shows digits changing at 0.017 second increments. It would be wonderful to have a true millisecond clock for precision video analysis. Could a millisecond gauge be added? Can the phone’s internal clock actually support finer increments of time?

### 3/5 — Why display milliseconds if there is no timer function ?

*2023-01-24*

This clock has potential to be useful … but the millisecond display serves no purpose. … PLEASE, add a stopwatch/timer function.

## Frequently asked questions about Millisecond Clock

### What is the accuracy of Millisecond Clock?

Millisecond Clock provides time accuracy up to 1/1000 of a second (millisecond). This level of precision is ideal for detailed timing measurements.

### What devices does Millisecond Clock support?

Millisecond Clock is available for iPhone, iPad, and iPod touch devices. It is designed to leverage the capabilities of these Apple platforms.

### How can Millisecond Clock be used for network testing?

You can use Millisecond Clock to measure network delays by comparing the time displayed on the app with the time shown on a TV or other display. The time difference can indicate network latency.

### Is Millisecond Clock free to use?

Yes, Millisecond Clock is free to download and use. It also offers in-app purchases for additional features or content.

### What is the age rating for Millisecond Clock?

Millisecond Clock has an age rating of 4+, making it suitable for a wide range of users. It contains no mature content.

### How often is Millisecond Clock updated?

The latest version, 2.2.0, was released on March 4, 2024. Updates are released periodically to improve performance and add features.

### What do users like about Millisecond Clock?

Users appreciate the app's exceptional accuracy, with an average rating of 4.8 stars from 98 ratings. Its utility for precise timing is a key positive aspect.

### Can Millisecond Clock be used for video streaming analysis?

Yes, Millisecond Clock can assist in measuring video streaming lag. By observing time differences between the camera display and the TV, users can identify and quantify delays.

## Version history (last 5 releases)

### 2.3.0 — 2026-08-19

- Reduced battery and GPU usage from the clock's glowing digit effect, especially during long display sessions.
- Fixed a bug where the ad banner could duplicate and use extra memory when returning to the main screen.
- Smoother scrolling in the Themes and Date Format selection screens.
- Updated the advertising SDK to the latest version for improved reliability.
- General performance and stability improvements to the clock display.
- Reduced unnecessary background processing for better overall efficiency.

### 2.2.0 — 2024-03-04

- Bug fixes and performance improvements.

### 2.1.0 — 2023-09-18

- Minor bug fixes and other small improvements.

### 2.0.1 — 2020-08-29

- Minor bug fixes and other small improvements.

### 2.0.0 — 2020-08-27

No release notes.

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## More apps by Chia-Chun Hsieh

- [颱風假給我](https://appshunter.io/ios/app/id908221955)
- [The Legend of Moon](https://appshunter.io/ios/app/the-legend-of-moon/id919006747)
- [ŌωOmoji - Kaomoji Keyboard](https://appshunter.io/ios/app/oomoji-kaomoji-keyboard/id977876203)
- [OnClick!](https://appshunter.io/ios/app/onclick/id1006187214)
- [Blend - Block Eliminate](https://appshunter.io/ios/app/blend-block-eliminate/id1015346461)
- [GPX Editor](https://appshunter.io/ios/app/gpx-editor/id1059292866)

All apps by Chia-Chun Hsieh: https://appshunter.io/developer/908221958

## Related topics

[msec](https://appshunter.io/ios/topics/msec)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*