# StemFox Scientific Calculator vs Mechanical Engineering Toolkit

The clearest difference is ads: StemFox Scientific Calculator at none against Mechanical Engineering Toolkit's shown. StemFox Scientific Calculator also leads on review sentiment (90% vs 57%). Mechanical Engineering Toolkit's advantage is update cadence (every 5 days vs every 3 months) and monetization model (ad-supported vs freemium). On price, rating, in-app purchases 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 and Mechanical Engineering Toolkit sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.8 for StemFox Scientific Calculator against 4.8 for Mechanical Engineering Toolkit. That said, the two scores are not equally well evidenced: Mechanical Engineering Toolkit has 64 ratings behind it against 11, so its average is the more settled of the two. Written reviews are what separate them: 90% of StemFox Scientific Calculator's written reviews are positive against 57% of Mechanical Engineering Toolkit's.

StemFox Scientific Calculator ships an update every 3 months, Mechanical Engineering Toolkit every 5 days. The most recent releases landed on October 25, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | StemFox Scientific Calculator | Mechanical Engineering Toolkit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (11 ratings)](https://appshunter.io/ios/app/stemfox-scientific-calculator/id1411592118/reviews)** | [4.8 (64 ratings)](https://appshunter.io/ios/app/mechanical-engineering-toolkit/id1601099443/reviews) |
| Number of ratings | 11 | **64** |
| Positive reviews | **90.0% of reviews** | 57.1% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 5 days** |
| Monetization | Freemium | **Ad-supported** |
| Size | 24 MB | 47 MB |
| Requires iOS | 15 | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Joshua Bryson](https://appshunter.io/developer/1367675392) | [APPS BAY LIMITED](https://appshunter.io/developer/1599035519) |

## 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

**Features:** Vision Pro support

**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 |


### Mechanical Engineering Toolkit

[App page](https://appshunter.io/ios/app/mechanical-engineering-toolkit/id1601099443)

This utility app provides a comprehensive collection of engineering equations and formulas for students and professionals. Easily perform calculations by selecting a formula and inputting variables, with detailed instructions and reference material included.

**Highlights:** Engineering equations and formulas, Mechanics of Material calculations, Theory of Elasticity formulas, Composite Material properties, Reference material, Variable input for calculations

**Features:** Vision Pro support, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


## Frequently asked questions

### Is StemFox Scientific Calculator free?

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

### Is Mechanical Engineering Toolkit free?

Mechanical Engineering Toolkit is free to download, with in-app purchases available.

### Which has better reviews, StemFox Scientific Calculator or Mechanical Engineering Toolkit?

StemFox Scientific Calculator is rated higher. StemFox Scientific Calculator averages 4.8 out of 5 from 11 ratings, while Mechanical Engineering Toolkit averages 4.8 from 64 ratings.

### Do StemFox Scientific Calculator or Mechanical Engineering Toolkit have ads?

Mechanical Engineering Toolkit shows ads; StemFox Scientific Calculator does not.

### Which is updated more often, StemFox Scientific Calculator or Mechanical Engineering Toolkit?

StemFox Scientific Calculator ships an update every 3 months, and Mechanical Engineering Toolkit every 5 days. Most recently, StemFox Scientific Calculator was updated on October 25, 2026 and Mechanical Engineering Toolkit on October 27, 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.*