# Millisecond Clock vs Flip Clock

The clearest difference is ads: Flip Clock at none against Millisecond Clock's shown. Flip Clock also leads on update cadence (every 2 weeks vs every 6 months) and review sentiment (100% vs 73%). Millisecond Clock's advantage is ratings volume (131 vs 28) and iOS requirement (15.0 vs 17.0). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. Millisecond Clock sells 3 one-off in-app purchases and Flip Clock sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Flip Clock holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 131 and 28 respectively. Written reviews point the same way: 73% of Millisecond Clock's written reviews are positive against 100% of Flip Clock's.

Millisecond Clock ships an update every 6 months, Flip Clock every 2 weeks. Both last shipped on October 14, 2026.

## The numbers

| Metric | Millisecond Clock | Flip Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (131 ratings)](https://appshunter.io/ios/app/millisecond-clock/id1526615560/reviews) | **[5.0 (28 ratings)](https://appshunter.io/ios/app/flip-clock-calm-desk-timer/id6443838087/reviews)** |
| Number of ratings | **131** | 28 |
| Positive reviews | 72.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 6 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 4 MB | 55 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Chia-Chun Hsieh](https://appshunter.io/developer/908221958) | [通 张](https://appshunter.io/developer/1330936821) |

## What reviewers say

### Millisecond Clock

[App page](https://appshunter.io/ios/app/millisecond-clock/id1526615560)

This app displays the most accurate time available, down to the millisecond. It's useful for measuring network delays or video streaming lag by comparing displayed time differences.

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

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

**In-app purchases (3)**

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


### Flip Clock

[App page](https://appshunter.io/ios/app/flip-clock-calm-desk-timer/id6443838087)

Transform your device into a stylish digital or analog clock. Offers extensive customization with various styles, fonts, skins, and backgrounds. Choose between light and dark modes, 12 or 24-hour formats, and enable or disable flip animations and background sounds.

**Highlights:** Full-screen time and date display, Landscape and portrait modes, 12/24 hour format toggle, Dark/light mode switch, Flip clock and analog clock options, Customizable styles, fonts, and skins, Background sound on/off

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime | $7.99 | one-time |

**What reviewers like**

- 👍 Minimalist and clean design
- 🚫 Ad-free experience
- ⏱️ Easy to read time display
- 💡 Great for focus and studies
- 📱 Repurposes old phones effectively

**What reviewers complain about**

- 🔋 Potential battery consumption concern
- 💡 Limited customization for some users
- 💡 Screen burn protection mentioned for night use

**Reported bugs**

- Cannot set lock screen

**Requested features**

- Change background colors
- Add white noise options
- Task scheduling feature
- Resizing to fit phone screen
- Landscape and portrait modes


## Frequently asked questions

### Is Millisecond Clock free?

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

### Is Flip Clock free?

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

### Which has better reviews, Millisecond Clock or Flip Clock?

Flip Clock is rated higher. Millisecond Clock averages 4.7 out of 5 from 131 ratings, while Flip Clock averages 5.0 from 28 ratings.

### Do Millisecond Clock or Flip Clock have ads?

Millisecond Clock shows ads; Flip Clock does not.

### Which is updated more often, Millisecond Clock or Flip Clock?

Millisecond Clock ships an update every 6 months, and Flip Clock every 2 weeks. Most recently, Millisecond Clock was updated on October 14, 2026 and Flip Clock on October 14, 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.*