# Classicalc calculator vs World Time Shifter Clock

The clearest difference is price: World Time Shifter Clock at Free against Classicalc calculator's $0.99. World Time Shifter Clock also leads on rating (4.4 vs 3.8) and review sentiment (100% vs 63%). Classicalc calculator's advantage is ads (none vs shown) and device support (5 vs 2). On in-app purchases there is nothing between them.

World Time Shifter Clock is free to download; Classicalc calculator costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

World Time Shifter Clock holds the better App Store score, 4.4 against 3.8. That said, the two scores are not equally well evidenced: World Time Shifter Clock has 97 ratings behind it against 13, so its average is the more settled of the two. Written reviews point the same way: 63% of Classicalc calculator's written reviews are positive against 100% of World Time Shifter Clock's.

Classicalc calculator ships an update every 20 months, World Time Shifter Clock every 3 weeks. The most recent releases landed on October 24, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Classicalc calculator | World Time Shifter Clock |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [3.8 (13 ratings)](https://appshunter.io/ios/app/classicalc-calculator/id989434780/reviews) | **[4.4 (97 ratings)](https://appshunter.io/ios/app/world-time-shifter-clock/id1499246199/reviews)** |
| Number of ratings | 13 | **97** |
| Positive reviews | 62.5% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 20 months | **Every 3 weeks** |
| Monetization | Paid | **Ad-supported** |
| Size | 14 MB | 23 MB |
| Requires iOS | **12.0** | 18.0 |
| Devices | **iPhone, iPad, iPod, Mac, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Lukasz Kowalski](https://appshunter.io/developer/792954012) | [David Richmond](https://appshunter.io/developer/329944573) |

## What reviewers say

### Classicalc calculator

[App page](https://appshunter.io/ios/app/classicalc-calculator/id989434780)

This calculator app offers instant calculations as you type, following the mathematical order of operations. It features unique piano sound themes and allows seamless continuation of calculations across iPhone and Apple Watch. Your equations are automatically saved for convenience.

**Highlights:** Instant calculation as you type, Mathematical order of operators, Cross-device continuity (iPhone/Watch), Automatic equation saving, 14 piano sound themes, Copy result to clipboard

**In-app purchases:** none


### World Time Shifter Clock

[App page](https://appshunter.io/ios/app/world-time-shifter-clock/id1499246199)

This app helps you manage time across different time zones for global coordination. Easily plan meetings, stay connected with loved ones, and track events worldwide. Its intuitive display and time-shifting feature make it simple to understand and use.

**Highlights:** Intuitive world clock display, Time shifting for time zone comparison, Meeting scheduling across time zones, Travel time forecasting, Event reminders and notifications

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Classicalc calculator free?

Classicalc calculator costs $0.99, with no in-app purchases.

### Is World Time Shifter Clock free?

World Time Shifter Clock is free to download, with no in-app purchases.

### Which has better reviews, Classicalc calculator or World Time Shifter Clock?

World Time Shifter Clock is rated higher. Classicalc calculator averages 3.8 out of 5 from 13 ratings, while World Time Shifter Clock averages 4.4 from 97 ratings.

### Do Classicalc calculator or World Time Shifter Clock have ads?

World Time Shifter Clock shows ads; Classicalc calculator does not.

### Which is updated more often, Classicalc calculator or World Time Shifter Clock?

Classicalc calculator ships an update every 20 months, and World Time Shifter Clock every 3 weeks. Most recently, Classicalc calculator was updated on October 24, 2026 and World Time Shifter Clock on October 29, 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.*