# Flip clock vs Millisecond Clock

The clearest difference is monetization model: Millisecond Clock at free with in-app purchases against Flip clock's subscription. Millisecond Clock also leads on review sentiment (73% vs 57%). Flip clock's advantage is ads (none vs shown) and update cadence (every 3 weeks vs every 6 months). On price, rating, in-app purchases and device support there is nothing between them.

Both are free to download. Flip clock sells 2 in-app purchases, starting at $5.49 per year and Millisecond Clock sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.6 for Flip clock against 4.7 for Millisecond Clock. That said, the two scores are not equally well evidenced: Flip clock has 4.8K ratings behind it against 131, so its average is the more settled of the two. Written reviews are what separate them: 57% of Flip clock's written reviews are positive against 73% of Millisecond Clock's.

Flip clock ships an update every 3 weeks, Millisecond Clock every 6 months. The most recent releases landed on September 23, 2026 and September 6, 2026 respectively.

## The numbers

| Metric | Flip clock | Millisecond Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (4.8K ratings)](https://appshunter.io/ios/app/flip-clock-no-ads/id1522242289/reviews) | **[4.7 (131 ratings)](https://appshunter.io/ios/app/millisecond-clock/id1526615560/reviews)** |
| Number of ratings | **4.8K** | 131 |
| Positive reviews | 57.0% of reviews | **72.7% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 6 months |
| Monetization | Subscription | **Free with in-app purchases** |
| Size | 64 MB | 4 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Beijing Free Calculator Technology Co., Ltd.](https://appshunter.io/developer/1457813265) | [Chia-Chun Hsieh](https://appshunter.io/developer/908221958) |

## What reviewers say

### Flip clock

[App page](https://appshunter.io/ios/app/flip-clock-no-ads/id1522242289)

A digital clock app featuring a unique page-turning animation and customizable backgrounds. It includes white noise sounds, hourly chimes, and a timer for enhanced functionality. Personalize your display with various skins, colors, and animations.

**Highlights:** Page-turning digital clock animation, 123 White Noise Sounds, Customizable skins and colors, Hourly chime and timer functions, Charging animation, Widget support

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Clock — annual subscription | $5.49 | per year |
| Permanent purchase | $3.99 | one-time |

**What reviewers like**

- 👍 Simple and straightforward
- 🌟 Customizable clock design
- 💤 Helpful for sleep and focus
- 🕰️ Useful as a desk clock

**What reviewers complain about**

- 💰 Most features require a subscription
- 🔒 Limited functionality without paying
- 🐛 Occasional bugs and syncing issues
- 🕰️ Clock not always accurate

**Reported bugs**

- Widget freezes or stops updating
- Time display not syncing correctly
- Subscription issues and lost purchases

**Requested features**

- Add alarm clock functionality
- Allow customization of widget
- Improve dark mode/night settings
- Introduce more free features


### 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 |


## Frequently asked questions

### Is Flip clock free?

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

### Is Millisecond Clock free?

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

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

Millisecond Clock is rated higher. Flip clock averages 4.6 out of 5 from 4.8K ratings, while Millisecond Clock averages 4.7 from 131 ratings.

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

Millisecond Clock shows ads; Flip clock does not.

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

Flip clock ships an update every 3 weeks, and Millisecond Clock every 6 months. Most recently, Flip clock was updated on September 23, 2026 and Millisecond Clock on September 6, 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.*