# Chronometer and Countdown HD vs Conversion Calculator Units

The clearest difference is review sentiment: Conversion Calculator Units at 82% against Chronometer and Countdown HD's 0%. Conversion Calculator Units also leads on price (Free vs $0.99) and rating (4.7 vs 2.0). Chronometer and Countdown HD's advantage is in-app purchases (none vs 1) and ads (none vs shown).

Conversion Calculator Units is free to download; Chronometer and Countdown HD costs $0.99 up front. Conversion Calculator Units sells 1 one-off in-app purchase. Chronometer and Countdown HD asks for nothing beyond the download.

Conversion Calculator Units holds the better App Store score, 4.7 against 2.0. That said, the two scores are not equally well evidenced: Conversion Calculator Units has 5K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 0% of Chronometer and Countdown HD's written reviews are positive against 82% of Conversion Calculator Units's.

Chronometer and Countdown HD ships an update every 42 months, Conversion Calculator Units every 2 months. The most recent releases landed on September 14, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Chronometer and Countdown HD | Conversion Calculator Units |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [2.0 (1 ratings)](https://appshunter.io/ios/app/chronometer-and-countdown-hd/id380855822/reviews) | **[4.7 (5K ratings)](https://appshunter.io/ios/app/conversion-calculator-units/id727632233/reviews)** |
| Number of ratings | 1 | **5K** |
| Positive reviews | 0.0% of reviews | **82.1% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 42 months | **Every 2 months** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 3 MB | 41 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Gianluca Natalini](https://appshunter.io/developer/348380792) | [RV AppStudios LLC](https://appshunter.io/developer/340181308) |

## What reviewers say

### Chronometer and Countdown HD

[App page](https://appshunter.io/ios/app/chronometer-and-countdown-hd/id380855822)

This utility app transforms your iPad into a versatile multi-stopwatch and multi-countdown timer. It's ideal for timing sporting events, athletic training, or motor racing, allowing simultaneous use of multiple timers and lap measurements.

**Highlights:** 4 independent stopwatches, Lap timing for up to 8 events, 4 independent countdown timers, Adjustable countdown times, Synchronization buttons, Background operation

**Features:** macOS Compatibility

**In-app purchases:** none


### Conversion Calculator Units

[App page](https://appshunter.io/ios/app/conversion-calculator-units/id727632233)

This app offers a simple and powerful way to convert between over 140 units across 12 categories. Easily switch between units, customize your experience with themes, and share your results.

**Highlights:** Converts over 140 units, Supports 12 conversion categories, Customizable themes, Drag and set unit positions, Add units to favorites, Share converted units via email

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |

**What reviewers like**

- 👍 User-friendly
- 🚀 Easy to use
- 💡 Helpful for learning metric system
- 👍 Great for conversions
- 👍 Intuitive interface

**What reviewers complain about**

- 🐛 Ads disrupt usage
- 🐛 Difficult to change units
- 🐛 Lacks portrait mode
- 🐛 Upside-down orientation issues
- 🐛 Cluttered UI design

**Reported bugs**

- Ads not removed after purchase
- Incorrect unit conversions

**Requested features**

- Add pressure conversion units
- Include a basic calculator function
- Implement multi-language support
- Allow customization of unit order


## Frequently asked questions

### Is Chronometer and Countdown HD free?

Chronometer and Countdown HD costs $0.99, with no in-app purchases.

### Is Conversion Calculator Units free?

Conversion Calculator Units is free to download, with in-app purchases available.

### Which has better reviews, Chronometer and Countdown HD or Conversion Calculator Units?

Conversion Calculator Units is rated higher. Chronometer and Countdown HD averages 2.0 out of 5 from 1 ratings, while Conversion Calculator Units averages 4.7 from 5K ratings.

### Do Chronometer and Countdown HD or Conversion Calculator Units have ads?

Conversion Calculator Units shows ads; Chronometer and Countdown HD does not.

### Which is updated more often, Chronometer and Countdown HD or Conversion Calculator Units?

Chronometer and Countdown HD ships an update every 42 months, and Conversion Calculator Units every 2 months. Most recently, Chronometer and Countdown HD was updated on September 14, 2026 and Conversion Calculator Units on October 2, 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.*