# Spacetime Clock vs iCalculator

The clearest difference is price: Spacetime Clock at Free against iCalculator's $1.99. Spacetime Clock also leads on in-app purchases (none vs 1). iCalculator's advantage is rating (5.0 vs 2.8) and review sentiment (76% vs 41%). On ratings volume and ads there is nothing between them.

Spacetime Clock is free to download; iCalculator costs $1.99 up front. iCalculator sells 1 in-app purchase, starting at $0.49 per month. Spacetime Clock asks for nothing beyond the download.

iCalculator holds the better App Store score, 5.0 against 2.8. Both are backed by a comparable volume of ratings — 4 and 3 respectively. Written reviews point the same way: 41% of Spacetime Clock's written reviews are positive against 76% of iCalculator's.

Spacetime Clock ships an update every 5 weeks, iCalculator every 9 days. The most recent releases landed on October 28, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Spacetime Clock | iCalculator |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | [2.8 (4 ratings)](https://appshunter.io/ios/app/spacetime-clock/id404558956/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/icalculator-keyboard-calc/id1176527512/reviews)** |
| Number of ratings | **4** | 3 |
| Positive reviews | 40.9% of reviews | **76.2% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 9 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 6 MB | 6 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [y-design](https://appshunter.io/developer/398188218) | [Nan Chao](https://appshunter.io/developer/965680403) |

## What reviewers say

### Spacetime Clock

[App page](https://appshunter.io/ios/app/spacetime-clock/id404558956)

Explore celestial mechanics and terrestrial positioning with this app. Visualize moon phases, Earth's rotation, and your location's latitude and longitude. It also includes a compass and level meter for your device.

**Highlights:** Moon phases visualization, Earth rotation and revolution simulation, Latitude and longitude display, Compass functionality, iPhone level meter, Customizable background colors

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

**In-app purchases:** none


### iCalculator

[App page](https://appshunter.io/ios/app/icalculator-keyboard-calc/id1176527512)

This app offers a powerful and intuitive calculator experience, featuring both basic and scientific functions. It calculates results instantly as you type and allows for easy editing and history management. Customize your experience with themes and integrate it seamlessly as a keyboard or Today Widget.

**Highlights:** Instant calculation without '=' button, Basic & Scientific Calculator, Fraction & Expression Calculator, History List with iCloud sync, Customizable themes, Keyboard extension for any app, Today Widget support

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $0.49 | per month |


## Frequently asked questions

### Is Spacetime Clock free?

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

### Is iCalculator free?

iCalculator costs $1.99, and also offers in-app purchases.

### Which has better reviews, Spacetime Clock or iCalculator?

iCalculator is rated higher. Spacetime Clock averages 2.8 out of 5 from 4 ratings, while iCalculator averages 5.0 from 3 ratings.

### Do Spacetime Clock or iCalculator have ads?

Neither Spacetime Clock nor iCalculator shows ads.

### Which is updated more often, Spacetime Clock or iCalculator?

Spacetime Clock ships an update every 5 weeks, and iCalculator every 9 days. Most recently, Spacetime Clock was updated on October 28, 2026 and iCalculator on October 29, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*