# Relativity Widget vs SFX Scientific Calc Premium

The clearest difference is price: Relativity Widget at Free against SFX Scientific Calc Premium's $5.99. Relativity Widget also leads on rating (5.0 vs 4.3) and review sentiment (100% vs 80%). SFX Scientific Calc Premium's advantage is update cadence (monthly vs every 6 months) and device support (4 vs 2). On ratings volume, ads, in-app purchases and iOS requirement there is nothing between them.

Relativity Widget is free to download; SFX Scientific Calc Premium costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Relativity Widget holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 2 and 3 respectively. Written reviews point the same way: 100% of Relativity Widget's written reviews are positive against 80% of SFX Scientific Calc Premium's.

Relativity Widget ships an update every 6 months, SFX Scientific Calc Premium monthly. The most recent releases landed on October 30, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Relativity Widget | SFX Scientific Calc Premium |
| --- | --- | --- |
| Price | **Free** | $5.99 |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/relativity-widget/id1534420574/reviews)** | [4.3 (3 ratings)](https://appshunter.io/ios/app/sfx-scientific-calc-premium/id1573567879/reviews) |
| Number of ratings | 2 | **3** |
| Positive reviews | **100.0% of reviews** | 80.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Monthly** |
| Monetization | **Free** | Paid |
| Size | 1 MB | 16 MB |
| Requires iOS | 14.0 | 14.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Eliott Morgensztern](https://appshunter.io/developer/1478504124) | [Wai Kwong Lee](https://appshunter.io/developer/1548427960) |

## What reviewers say

### Relativity Widget

[App page](https://appshunter.io/ios/app/relativity-widget/id1534420574)

Visualize Einstein's theories of relativity directly on your home screen. Choose between Special Relativity to see time dilation in a spaceship or General Relativity to observe time differences near a black hole.

**Highlights:** Special Relativity visualization, General Relativity visualization, Time dilation display, Home screen integration, Customizable speed/distance settings

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

**In-app purchases:** none


### SFX Scientific Calc Premium

[App page](https://appshunter.io/ios/app/sfx-scientific-calc-premium/id1573567879)

This scientific calculator offers advanced functions for academic, scientific, and engineering needs. It supports basic arithmetic, memory storage, statistical calculations, and various mathematical functions. The interface mimics a popular Casio model for ease of use.

**Highlights:** Basic arithmetic operations, Constant and volatile memory storage, Fraction and percentage calculations, Linear regression and statistics, Number base conversions (Binary, Octal, Decimal, Hexadecimal), Trigonometric, hyperbolic, and logarithmic functions, Formula calculations

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Relativity Widget free?

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

### Is SFX Scientific Calc Premium free?

SFX Scientific Calc Premium costs $5.99, with no in-app purchases.

### Which has better reviews, Relativity Widget or SFX Scientific Calc Premium?

Relativity Widget is rated higher. Relativity Widget averages 5.0 out of 5 from 2 ratings, while SFX Scientific Calc Premium averages 4.3 from 3 ratings.

### Do Relativity Widget or SFX Scientific Calc Premium have ads?

Neither Relativity Widget nor SFX Scientific Calc Premium shows ads.

### Which is updated more often, Relativity Widget or SFX Scientific Calc Premium?

Relativity Widget ships an update every 6 months, and SFX Scientific Calc Premium monthly. Most recently, Relativity Widget was updated on October 30, 2026 and SFX Scientific Calc Premium on October 25, 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.*