# Dr. Hahn Instructions vs Pair Cale

The clearest difference is in-app purchases: Dr. Hahn Instructions at none against Pair Cale's 2. Dr. Hahn Instructions also leads on iOS requirement (11.0 vs 16.6). Pair Cale's advantage is update cadence (every 5 days vs every 15 months). On price, ads and device support there is nothing between them.

Both are free to download. Pair Cale sells 2 one-off in-app purchases. Dr. Hahn Instructions asks for nothing beyond the download.

Dr. Hahn Instructions ships an update every 15 months, Pair Cale every 5 days. The most recent releases landed on September 18, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Dr. Hahn Instructions | Pair Cale |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (1 ratings)](https://appshunter.io/ios/app/pair-cale/id1376462458/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 31.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 5 days** |
| Monetization | — | Free with in-app purchases |
| Size | 18 MB | 12 MB |
| Requires iOS | **11.0** | 16.6 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Team Stiefelhagen Werbeagentur GmbH](https://appshunter.io/developer/1031243988) | [Kazumasa Shimomura](https://appshunter.io/developer/1110502851) |

## What reviewers say

### Dr. Hahn Instructions

[App page](https://appshunter.io/ios/app/dr-hahn-instructions/id1147190358)

**Features:** macOS Compatibility

**In-app purchases:** none


### Pair Cale

[App page](https://appshunter.io/ios/app/pair-cale/id1376462458)

Easily share and sync work schedules in real-time with your partner. Ideal for couples with shift work, offering automatic updates, custom shifts, and a clean interface for effortless coordination.

**Highlights:** Real-time schedule synchronization, Automatic updates, Customizable shift names and colors, Offline access to synced schedules, Intuitive and minimalist design, Privacy-focused secure design

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Show rokuyo(六曜) | $1.99 | one-time |
| Hide advertising | $2.99 | one-time |


## Frequently asked questions

### Is Dr. Hahn Instructions free?

Dr. Hahn Instructions is free to download, with no in-app purchases.

### Is Pair Cale free?

Pair Cale is free to download, with in-app purchases available.

### Do Dr. Hahn Instructions or Pair Cale have ads?

Neither Dr. Hahn Instructions nor Pair Cale shows ads.

### Which is updated more often, Dr. Hahn Instructions or Pair Cale?

Dr. Hahn Instructions ships an update every 15 months, and Pair Cale every 5 days. Most recently, Dr. Hahn Instructions was updated on September 18, 2026 and Pair Cale on September 23, 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.*