# SFX Scientific Calculator vs ReturnProof

The clearest difference is in-app purchases: SFX Scientific Calculator at none against ReturnProof's 3. SFX Scientific Calculator also leads on device support (4 vs 2) and iOS requirement (14.0 vs 17.0). ReturnProof's advantage is ads (none vs shown). On price there is nothing between them.

Both are free to download. ReturnProof sells 3 in-app purchases, starting at $2.99 per month. SFX Scientific Calculator asks for nothing beyond the download.

## The numbers

| Metric | SFX Scientific Calculator | ReturnProof |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (144 ratings)](https://appshunter.io/ios/app/sfx-scientific-calculator/id1548427958/reviews)** | — |
| Number of ratings | **144** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | — |
| Monetization | Ad-supported | — |
| Size | 20 MB | 1 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Wai Kwong Lee](https://appshunter.io/developer/1548427960) | [Max Babenko](https://appshunter.io/developer/939746569) |

## What reviewers say

### SFX Scientific Calculator

[App page](https://appshunter.io/ios/app/sfx-scientific-calculator/id1548427958)

This free calculator app is designed for academic, scientific, and engineering needs. It offers basic arithmetic, memory storage, fraction and percentage calculations, and advanced functions like linear regression and hexadecimal conversions. Its user interface mimics a Casio scientific calculator.

**Highlights:** Basic arithmetic, Constant and memory storage, Fraction and percentage calculation, Linear regression and statistics, Number base conversions (Binary, Octal, Decimal, Hexadecimal), Advanced mathematical functions, Formula calculations

**Features:** Vision Pro support

**In-app purchases:** none


### ReturnProof

[App page](https://appshunter.io/ios/app/returnproof/id6766030541)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ReturnProof Plus Monthly | $2.99 | per month |
| ReturnProof Plus Yearly | $14.99 | per year |
| ReturnProof Lifetime | $19.99 | one-time |


## Frequently asked questions

### Is SFX Scientific Calculator free?

SFX Scientific Calculator is free to download, with no in-app purchases.

### Is ReturnProof free?

ReturnProof is free to download, with in-app purchases available.

### Do SFX Scientific Calculator or ReturnProof have ads?

SFX Scientific Calculator shows ads; ReturnProof does not.

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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.*