# Calendio vs Cairn

The clearest difference is in-app purchases: Calendio at none against Cairn's 1. Calendio also leads on iOS requirement (13.0 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

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

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on October 11, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Calendio | Cairn |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Monetization | Free | — |
| Size | 11 MB | 22 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Mustafa Turk](https://appshunter.io/developer/1682700433) | [Dennis Hodgson](https://appshunter.io/developer/6776312396) |

## What reviewers say

### Calendio

[App page](https://appshunter.io/ios/app/calendio/id6447790237)

This app offers a clean and elegant way to manage your schedule. Its minimalistic design and user-friendly interface make organizing your day straightforward and efficient.

**Highlights:** Minimalistic design, Sleek interface, Easy navigation, Schedule organization, User-friendly

**Features:** macOS Compatibility

**In-app purchases:** none


### Cairn

[App page](https://appshunter.io/ios/app/cairn-screen-time-blocker/id6790536467)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cairn Unlock | $19.99 | one-time |


## Frequently asked questions

### Is Calendio free?

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

### Is Cairn free?

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

### Do Calendio or Cairn have ads?

Neither Calendio nor Cairn shows ads.

### Which is updated more often, Calendio or Cairn?

Calendio ships an update every 2 weeks, and Cairn every 2 weeks. Most recently, Calendio was updated on October 11, 2026 and Cairn on October 1, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*