# On the hour vs E6B Slide Rule

The clearest difference is price: On the hour at Free against E6B Slide Rule's $2.99. On the hour also leads on iOS requirement (15.1 vs 17.0). E6B Slide Rule's advantage is chart position (#172 vs unranked). On ads, in-app purchases and device support there is nothing between them.

On the hour is free to download; E6B Slide Rule costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | On the hour | E6B Slide Rule |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[4.0 (2 ratings)](https://appshunter.io/ios/app/on-the-hour/id6753136689/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Weekly | — |
| Monetization | Free | — |
| Best chart rank | — | **#172** |
| Size | 28 MB | 2 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [田丰 何](https://appshunter.io/developer/1674464316) | [Western Chancellor LLC](https://appshunter.io/developer/6810377018) |

## What reviewers say

### On the hour

[App page](https://appshunter.io/ios/app/on-the-hour/id6753136689)

This utility app provides a single, focused function: a chime that sounds precisely on the hour. It's designed for users who need a simple, reliable auditory reminder of passing time.

**Highlights:** Hourly chime notification, Simple, single-function design, Reliable timekeeping alert

**Features:** macOS Compatibility

**In-app purchases:** none


### E6B Slide Rule

[App page](https://appshunter.io/ios/app/e6b-slide-rule/id6810376836)

**Currently charting:** #172 Top Paid · Utilities (US App Store)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is On the hour free?

On the hour is free to download, with no in-app purchases.

### Is E6B Slide Rule free?

E6B Slide Rule costs $2.99, with no in-app purchases.

### Do On the hour or E6B Slide Rule have ads?

Neither On the hour nor E6B Slide Rule shows ads.

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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.*