# ReadableCalc vs Stopwatch Library

The clearest difference is in-app purchases: ReadableCalc at none against Stopwatch Library's 1. ReadableCalc also leads on iOS requirement (12.0 vs 17.0). Stopwatch Library's advantage is update cadence (every 3 days vs weekly). On price, ads and device support there is nothing between them.

Both are free to download. Stopwatch Library sells 1 one-off in-app purchase. ReadableCalc asks for nothing beyond the download.

ReadableCalc ships an update weekly, Stopwatch Library every 3 days. The most recent releases landed on October 7, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | ReadableCalc | Stopwatch Library |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 3 days** |
| Size | 28 MB | 5 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [YONAGARE LAB](https://appshunter.io/developer/1810986554) | [Naoyuki Hasegawa](https://appshunter.io/developer/6777422704) |

## What reviewers say

### ReadableCalc

[App page](https://appshunter.io/ios/app/readablecalc/id6747457253)

**Features:** macOS Compatibility

**In-app purchases:** none


### Stopwatch Library

[App page](https://appshunter.io/ios/app/stopwatch-library/id6794338987)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告を削除 | $2.99 | one-time |


## Frequently asked questions

### Is ReadableCalc free?

ReadableCalc is free to download, with no in-app purchases.

### Is Stopwatch Library free?

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

### Do ReadableCalc or Stopwatch Library have ads?

Neither ReadableCalc nor Stopwatch Library shows ads.

### Which is updated more often, ReadableCalc or Stopwatch Library?

ReadableCalc ships an update weekly, and Stopwatch Library every 3 days. Most recently, ReadableCalc was updated on October 7, 2026 and Stopwatch Library on October 13, 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.*