# Cliff Timer vs Mobile Booklet

The clearest difference is in-app purchases: Mobile Booklet at none against Cliff Timer's 3. Mobile Booklet also leads on update cadence (monthly vs every 5 months) and iOS requirement (15.6 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Cliff Timer sells 3 in-app purchases, starting at $0.99 per month. Mobile Booklet asks for nothing beyond the download.

Cliff Timer ships an update every 5 months, Mobile Booklet monthly. The most recent releases landed on September 14, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Cliff Timer | Mobile Booklet |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (10 ratings)](https://appshunter.io/ios/app/cliff-timer-height-measurer/id6736556211/reviews)** | — |
| Number of ratings | **10** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | **Monthly** |
| Monetization | Free with in-app purchases | — |
| Size | 16 MB | 60 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Frank Schipani](https://appshunter.io/developer/1772378774) | [Julian Gombos](https://appshunter.io/developer/1824875980) |

## What reviewers say

### Cliff Timer

[App page](https://appshunter.io/ios/app/cliff-timer-height-measurer/id6736556211)

Calculate the height of lightning strikes using a simple stopwatch and physics formulas. Measure the time between seeing lightning and hearing thunder to determine distance and height.

**Highlights:** Lightning height calculation, Lightning distance calculation, Uses physics formulas, Simple stopwatch interface, Real-time results

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $0.99 | per month |
| Yearly | $5.99 | per year |
| Lightning Distance Access | $1.99 | one-time |


### Mobile Booklet

[App page](https://appshunter.io/ios/app/mobile-booklet/id6748264656)

**In-app purchases:** none


## Frequently asked questions

### Is Cliff Timer free?

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

### Is Mobile Booklet free?

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

### Do Cliff Timer or Mobile Booklet have ads?

Neither Cliff Timer nor Mobile Booklet shows ads.

### Which is updated more often, Cliff Timer or Mobile Booklet?

Cliff Timer ships an update every 5 months, and Mobile Booklet monthly. Most recently, Cliff Timer was updated on September 14, 2026 and Mobile Booklet on September 12, 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.*