# Executive OS vs Cairn

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

Both are free to download. Cairn sells 1 one-off in-app purchase. Executive OS asks for nothing beyond the download.

Executive OS ships an update monthly, Cairn weekly. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Executive OS | Cairn |
| --- | --- | --- |
| Price | Free | 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 | Monthly | **Weekly** |
| Monetization | — | Free |
| Size | 9 MB | 17 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Birkan Aksoy](https://appshunter.io/developer/1626910993) | [飞 吕](https://appshunter.io/developer/1851387805) |

## What reviewers say

### Executive OS

[App page](https://appshunter.io/ios/app/executive-os-decision-journal/id6770634095)

**Features:** macOS Compatibility, 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 Executive OS free?

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

### Is Cairn free?

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

### Do Executive OS or Cairn have ads?

Neither Executive OS nor Cairn shows ads.

### Which is updated more often, Executive OS or Cairn?

Executive OS ships an update monthly, and Cairn weekly. Most recently, Executive OS was updated on October 28, 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.*