# Thunderstorm Calculator vs 1Daylight

The clearest difference is price: 1Daylight at Free against Thunderstorm Calculator's $0.99. 1Daylight also leads on update cadence (every 6 months vs every 33 months) and iOS requirement (12.0 vs 15.6). Thunderstorm Calculator's advantage is ads (none vs shown) and chart position (#151 vs unranked). On in-app purchases and device support there is nothing between them.

1Daylight is free to download; Thunderstorm Calculator costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Thunderstorm Calculator ships an update every 33 months, 1Daylight every 6 months. The most recent releases landed on October 24, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Thunderstorm Calculator | 1Daylight |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[3.0 (3 ratings)](https://appshunter.io/ios/app/thunderstorm-calculator/id389042852/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 33 months | **Every 6 months** |
| Monetization | Paid | — |
| Best chart rank | **#151** | — |
| Size | 18 MB | 45 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Piet Jonas](https://appshunter.io/developer/288060167) | [1Juhler ApS](https://appshunter.io/developer/1567349753) |

## What reviewers say

### Thunderstorm Calculator

[App page](https://appshunter.io/ios/app/thunderstorm-calculator/id389042852)

**Currently charting:** #151 Top Paid · Weather (US App Store)

Measure the distance to a thunderstorm by timing the interval between lightning and thunder. View your storm history to track its movement and toggle between metric and imperial units.

**Highlights:** Lightning and thunder timing, Distance calculation, Metric and imperial units, Storm history tracking, Apple Watch support

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

**In-app purchases:** none


### 1Daylight

[App page](https://appshunter.io/ios/app/1daylight/id1598001356)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Thunderstorm Calculator free?

Thunderstorm Calculator costs $0.99, with no in-app purchases.

### Is 1Daylight free?

1Daylight is free to download, with no in-app purchases.

### Do Thunderstorm Calculator or 1Daylight have ads?

1Daylight shows ads; Thunderstorm Calculator does not.

### Which is updated more often, Thunderstorm Calculator or 1Daylight?

Thunderstorm Calculator ships an update every 33 months, and 1Daylight every 6 months. Most recently, Thunderstorm Calculator was updated on October 24, 2026 and 1Daylight on October 6, 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.*