# InfusionLog vs Cairn

The clearest difference is update cadence: Cairn at weekly against InfusionLog's every 4 months. InfusionLog's advantage is iOS requirement (17.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. InfusionLog sells 2 in-app purchases, starting at $4.99 per month and Cairn sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

InfusionLog ships an update every 4 months, Cairn weekly. Both last shipped on October 25, 2026.

## The numbers

| Metric | InfusionLog | 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 | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Weekly** |
| Monetization | — | Free |
| Size | 6 MB | 17 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [慧慧 高](https://appshunter.io/developer/1887721875) | [飞 吕](https://appshunter.io/developer/1851387805) |

## What reviewers say

### InfusionLog

[App page](https://appshunter.io/ios/app/infusionlog/id6770405328)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $4.99 | per month |
| Pro Annual | $29.99 | per year |


### 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 InfusionLog free?

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

### Is Cairn free?

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

### Do InfusionLog or Cairn have ads?

Neither InfusionLog nor Cairn shows ads.

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

InfusionLog ships an update every 4 months, and Cairn weekly. Most recently, InfusionLog was updated on October 25, 2026 and Cairn on October 25, 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.*