# LensFlow Scanner vs Cairn

The clearest difference is in-app purchases: LensFlow Scanner at none against Cairn's 1. LensFlow Scanner also leads on iOS requirement (17.0 vs 26.0). 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. LensFlow Scanner asks for nothing beyond the download.

LensFlow Scanner ships an update every 9 days, Cairn weekly. Both last shipped on October 25, 2026.

## The numbers

| Metric | LensFlow Scanner | 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 | Every 9 days | **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 | [Huabo Zhang](https://appshunter.io/developer/6802511014) | [飞 吕](https://appshunter.io/developer/1851387805) |

## What reviewers say

### LensFlow Scanner

[App page](https://appshunter.io/ios/app/lensflow-scanner/id6802511012)

**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 LensFlow Scanner free?

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

### Is Cairn free?

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

### Do LensFlow Scanner or Cairn have ads?

Neither LensFlow Scanner nor Cairn shows ads.

### Which is updated more often, LensFlow Scanner or Cairn?

LensFlow Scanner ships an update every 9 days, and Cairn weekly. Most recently, LensFlow Scanner 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.*