# Notepad Calculator vs Cairn

The clearest difference is price: Cairn at Free against Notepad Calculator's $2.99. Cairn also leads on update cadence (weekly vs fortnightly). Notepad Calculator's advantage is in-app purchases (none vs 1) and iOS requirement (17.0 vs 26.0). On ads and device support there is nothing between them.

Cairn is free to download; Notepad Calculator costs $2.99 up front. Cairn sells 1 one-off in-app purchase. Notepad Calculator asks for nothing beyond the download.

Notepad Calculator ships an update fortnightly, Cairn weekly. Both last shipped on October 31, 2026.

## The numbers

| Metric | Notepad Calculator | Cairn |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/cairn-countdown-and-days-since/id6805060074/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | — | Free |
| Size | 4 MB | 17 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | iPhone, iPad, Mac | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [方成 印](https://appshunter.io/developer/423785440) | [飞 吕](https://appshunter.io/developer/1851387805) |

## What reviewers say

### Notepad Calculator

[App page](https://appshunter.io/ios/app/notepad-calculator/id6792239866)

**Features:** Vision Pro support

**In-app purchases:** none


### Cairn

[App page](https://appshunter.io/ios/app/cairn-countdown-and-days-since/id6805060074)

Track important upcoming dates and past anniversaries with a versatile countdown and count-up tool. It offers precise timing, customizable reminders, and various visual displays to keep you informed. Integrates seamlessly with your devices and data.

**Highlights:** Countdown and count-up for any event, Minute and second precision timing, Customizable repeat intervals, Time zone support, Visual progress tracking, Milestone markers, Home and Lock Screen widgets

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Unlock | $2.99 | one-time |


## Frequently asked questions

### Is Notepad Calculator free?

Notepad Calculator costs $2.99, with no in-app purchases.

### Is Cairn free?

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

### Do Notepad Calculator or Cairn have ads?

Neither Notepad Calculator nor Cairn shows ads.

### Which is updated more often, Notepad Calculator or Cairn?

Notepad Calculator ships an update fortnightly, and Cairn weekly. Most recently, Notepad Calculator was updated on October 31, 2026 and Cairn on October 31, 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.*