# QuickDoc vs Cairn

The clearest difference is price: QuickDoc at Free against Cairn's $0.99. QuickDoc also leads on iOS requirement (17.6 vs 26.0). Cairn's advantage is in-app purchases (none vs 1) and update cadence (weekly vs every 2 months). On ads there is nothing between them.

QuickDoc is free to download; Cairn costs $0.99 up front. QuickDoc sells 1 one-off in-app purchase. Cairn asks for nothing beyond the download.

QuickDoc ships an update every 2 months, Cairn weekly. The most recent releases landed on October 8, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | QuickDoc | Cairn |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| 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 | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | — | Free |
| Size | 11 MB | 8 MB |
| Requires iOS | **17.6** | 26.0 |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [友健 高](https://appshunter.io/developer/1871964438) | [飞 吕](https://appshunter.io/developer/1851387805) |

## What reviewers say

### QuickDoc

[App page](https://appshunter.io/ios/app/quickdoc-pdfscanner/id6789051205)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade to premium | $1.99 | one-time |


### 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:** none


## Frequently asked questions

### Is QuickDoc free?

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

### Is Cairn free?

Cairn costs $0.99, with no in-app purchases.

### Do QuickDoc or Cairn have ads?

Neither QuickDoc nor Cairn shows ads.

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

QuickDoc ships an update every 2 months, and Cairn weekly. Most recently, QuickDoc was updated on October 8, 2026 and Cairn on October 9, 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.*