# StemFox Scientific Calculator vs ENGINE SFC

The clearest difference is in-app purchases: ENGINE SFC at none against StemFox Scientific Calculator's 6. ENGINE SFC also leads on update cadence (daily vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. StemFox Scientific Calculator sells 6 in-app purchases, starting at $2.99 per month. ENGINE SFC asks for nothing beyond the download.

StemFox Scientific Calculator ships an update every 3 months, ENGINE SFC daily. The most recent releases landed on October 10, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | StemFox Scientific Calculator | ENGINE SFC |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (10 ratings)](https://appshunter.io/ios/app/stemfox-scientific-calculator/id1411592118/reviews)** | — |
| Number of ratings | **10** | — |
| Positive reviews | 90.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Daily** |
| Monetization | Freemium | — |
| Size | 16 MB | 6 MB |
| Requires iOS | **15** | 15.2 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Joshua Bryson](https://appshunter.io/developer/1367675392) | [Oleksii Nezhalskyi](https://appshunter.io/developer/1687730603) |

## What reviewers say

### StemFox Scientific Calculator

[App page](https://appshunter.io/ios/app/stemfox-scientific-calculator/id1411592118)

Streamline complex STEM calculations with a powerful calculator, textbook equation solver, and comprehensive unit converter. Designed for engineers, it reduces busywork and improves accuracy for homework and technical tasks.

**Highlights:** Advanced scientific calculator with 80+ functions, Textbook equation solver for any variable, Searchable equation database by chapter, Fast table lookup with linear interpolation, Comprehensive unit converter with 300+ conversions, Copy and paste functionality for values and equations

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly - Unlimited | $2.99 | per month |
| Yearly - Unlimited | $9.99 | per year |
| Donut | $0.99 | one-time |
| Drink | $2.99 | one-time |
| Taco | $4.99 | one-time |
| Pizza | $9.99 | one-time |


### ENGINE SFC

[App page](https://appshunter.io/ios/app/engine-sfc/id6469806252)

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

**In-app purchases:** none


## Frequently asked questions

### Is StemFox Scientific Calculator free?

StemFox Scientific Calculator is free to download, with in-app purchases available.

### Is ENGINE SFC free?

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

### Do StemFox Scientific Calculator or ENGINE SFC have ads?

Neither StemFox Scientific Calculator nor ENGINE SFC shows ads.

### Which is updated more often, StemFox Scientific Calculator or ENGINE SFC?

StemFox Scientific Calculator ships an update every 3 months, and ENGINE SFC daily. Most recently, StemFox Scientific Calculator was updated on October 10, 2026 and ENGINE SFC on October 19, 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.*