# CalcFast vs World Clock Pro

The clearest difference is rating: World Clock Pro at 4.8 against CalcFast's 4.2. World Clock Pro also leads on ratings volume (1.3K vs 20) and iOS requirement (13.0 vs 18.0). CalcFast's advantage is in-app purchases (none vs 6). On price, review sentiment, update cadence and ads there is nothing between them.

Both are free to download. World Clock Pro sells 5 in-app purchases, starting at $1.99 per month. CalcFast asks for nothing beyond the download.

World Clock Pro holds the better App Store score, 4.8 against 4.2. That said, the two scores are not equally well evidenced: World Clock Pro has 1.3K ratings behind it against 20, so its average is the more settled of the two. Written reviews complicate that: 78% of CalcFast's written reviews are positive against 77% of World Clock Pro's, so the app with the better star average is not the one people write more warmly about.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 19, 2026 and September 3, 2026 respectively.

## The numbers

| Metric | CalcFast | World Clock Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (20 ratings)](https://appshunter.io/ios/app/calcfast/id876781417/reviews) | **[4.8 (1.3K ratings)](https://appshunter.io/ios/app/world-clock-pro-convert-time/id969635117/reviews)** |
| Number of ratings | 20 | **1.3K** |
| Positive reviews | **78.3% of reviews** | 76.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | **Free** | Subscription |
| Size | 6 MB | 41 MB |
| Requires iOS | 18.0 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hannes Sverrisson](https://appshunter.io/developer/428851947) | [Alex Komarov Inc.](https://appshunter.io/developer/364741805) |

## What reviewers say

### CalcFast

[App page](https://appshunter.io/ios/app/calcfast/id876781417)

A fast and elegant calculator for Apple devices that displays your calculation history. It offers a Today Extension for quick access and supports Apple Watch, external keyboards, and VoiceOver.

**Highlights:** Calculation history display, Today Extension for quick calculations, Apple Watch app, Dark/light mode selection, External keyboard support, VoiceOver support

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### World Clock Pro

[App page](https://appshunter.io/ios/app/world-clock-pro-convert-time/id969635117)

Easily track and convert time across multiple global time zones. Schedule events, share accurate times instantly, and access a vast database of cities and time zones. Ideal for international communication and planning.

**Highlights:** Universal clock access, Effortless time conversion, Schedule calendar events, Instant time sharing, Large city and timezone database, Automatic timezone updates

**Features:** Family Sharing

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 month | $1.99 | per month |
| 1 month | $2.99 | per month |
| 1 year | $9.99 | per year |
| 1 year | $11.99 | per year |
| 1 year | $19.99 | per year |

**What reviewers like**

- 🚀 Elegant and intuitive interface
- 🔍 Excellent visualization of multiple time zones
- ⏱ Seamless time shifting
- 🌍 Convenient for international teams and travelers
- 📆 Helpful for scheduling across time zones

**What reviewers complain about**

- 🐛 Widget issues and lack of functionality
- 🖥 Lack of iPad and landscape mode support
- 🔧 Concerns about app updates and feature removals
- 💰 Complaints about subscription model and pricing

**Reported bugs**

- Widget not working on iOS 14 and newer
- Issues with local time zone detection and display
- Inconsistent behavior after app updates

**Requested features**

- Add date function for future time zone changes
- Ability to customize and sort displayed time zones
- Implement an Apple Watch app
- Improve widget functionality and customization


## Frequently asked questions

### Is CalcFast free?

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

### Is World Clock Pro free?

World Clock Pro is free to download, with in-app purchases available.

### Which has better reviews, CalcFast or World Clock Pro?

World Clock Pro is rated higher. CalcFast averages 4.2 out of 5 from 20 ratings, while World Clock Pro averages 4.8 from 1.3K ratings.

### Do CalcFast or World Clock Pro have ads?

Neither CalcFast nor World Clock Pro shows ads.

### Which is updated more often, CalcFast or World Clock Pro?

CalcFast ships an update every 2 months, and World Clock Pro every 2 months. Most recently, CalcFast was updated on September 19, 2026 and World Clock Pro on September 3, 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.*