# World Timezone Calendar vs Rainfall Calculator

The clearest difference is price: World Timezone Calendar at Free against Rainfall Calculator's $2.99. World Timezone Calendar also leads on update cadence (every 4 months vs every 29 months) and ratings volume (315 vs 1). Rainfall Calculator's advantage is in-app purchases (none vs 1) and ads (none vs shown). On rating and device support there is nothing between them.

World Timezone Calendar is free to download; Rainfall Calculator costs $2.99 up front. World Timezone Calendar sells 1 one-off in-app purchase. Rainfall Calculator asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.9 for World Timezone Calendar against 5.0 for Rainfall Calculator. That said, the two scores are not equally well evidenced: World Timezone Calendar has 315 ratings behind it against 1, so its average is the more settled of the two.

World Timezone Calendar ships an update every 4 months, Rainfall Calculator every 29 months. The most recent releases landed on October 26, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | World Timezone Calendar | Rainfall Calculator |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | [4.9 (315 ratings)](https://appshunter.io/ios/app/world-timezone-calendar/id792552743/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rainfall-calculator/id1446150880/reviews)** |
| Number of ratings | **315** | 1 |
| Positive reviews | 76.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 4 months** | Every 29 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 19 MB | 1 MB |
| Requires iOS | 16.6 | **13** |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Geospike Pty Ltd](https://appshunter.io/developer/500622151) | [Nitrio](https://appshunter.io/developer/321121189) |

## What reviewers say

### World Timezone Calendar

[App page](https://appshunter.io/ios/app/world-timezone-calendar/id792552743)

Easily schedule meetings and events across different time zones. This app helps you find the perfect time for global coordination by comparing multiple time zones and integrating with your existing calendar. Plan ahead with future time views and share events that automatically adjust to recipients' local times.

**Highlights:** Cross-timezone scheduling, View calendar in multiple timezones, Time travel to plan ahead, Add unlimited timezones, Day/night indicators, Home screen widget, Global event sharing

**Features:** Apple Watch app

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Advertising | $19.95 | one-time |

**What reviewers like**

- 👍 Easy to use
- 🌍 Great for multiple time zones
- 💡 Simple and efficient
- ✅ Clear display
- 🤝 Helpful for international scheduling

**What reviewers complain about**

- 💰 Expensive ad-free version
- 🔞 Inappropriate ads in free version
- 💸 High price for functionality

**Reported bugs**

- 🐛 Inappropriate ads in free version
- 🐛 Widget settings not saved
- 🐛 Cannot add new events with double tap
- 🐛 Timezone abbreviations not displayed
- 🐛 Search feature doesn't work

**Requested features**

- Add more cities
- Option to freeze time zones for comparison
- Switch between 24-hour and AM/PM clock
- Cleaner design with better calendar event integration
- Ability to pick a specific date to view


### Rainfall Calculator

[App page](https://appshunter.io/ios/app/rainfall-calculator/id1446150880)

Calculate potential rainwater harvest volume and cost savings. This tool helps determine annual water collection capacity based on rainfall and roof area, recommending optimal tank sizes for efficient water storage. It also allows for cost-saving analysis by comparing harvested water to mains water prices.

**Highlights:** Instant rainwater calculation, Cost savings evaluation, Minimum tank size recommendation, Supports various input units, Formula references included, Results copyable to other apps

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is World Timezone Calendar free?

World Timezone Calendar is free to download, with in-app purchases available.

### Is Rainfall Calculator free?

Rainfall Calculator costs $2.99, with no in-app purchases.

### Which has better reviews, World Timezone Calendar or Rainfall Calculator?

Rainfall Calculator is rated higher. World Timezone Calendar averages 4.9 out of 5 from 315 ratings, while Rainfall Calculator averages 5.0 from 1 ratings.

### Do World Timezone Calendar or Rainfall Calculator have ads?

World Timezone Calendar shows ads; Rainfall Calculator does not.

### Which is updated more often, World Timezone Calendar or Rainfall Calculator?

World Timezone Calendar ships an update every 4 months, and Rainfall Calculator every 29 months. Most recently, World Timezone Calendar was updated on October 26, 2026 and Rainfall Calculator on October 13, 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.*