# Slope Calculator Plus vs Mechanical Formula

The clearest difference is price: Mechanical Formula at Free against Slope Calculator Plus's $2.99. Mechanical Formula also leads on update cadence (every 4 months vs every 23 months) and iOS requirement (13.0 vs 17.0). Slope Calculator Plus's advantage is in-app purchases (none vs 1). On ads and device support there is nothing between them.

Mechanical Formula is free to download; Slope Calculator Plus costs $2.99 up front. Mechanical Formula sells 1 one-off in-app purchase. Slope Calculator Plus asks for nothing beyond the download.

Slope Calculator Plus ships an update every 23 months, Mechanical Formula every 4 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | Slope Calculator Plus | Mechanical Formula |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[4.7 (34 ratings)](https://appshunter.io/ios/app/mechanical-formula/id1668948373/reviews)** |
| Number of ratings | — | **34** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 23 months | **Every 4 months** |
| Monetization | — | Free with in-app purchases |
| Size | 1 MB | 42 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 9+ | 4+ |
| Developer | [Heng Jia Liang](https://appshunter.io/developer/1532000635) | [Kantaben Gorasiya](https://appshunter.io/developer/1640260396) |

## What reviewers say

### Slope Calculator Plus

[App page](https://appshunter.io/ios/app/slope-calculator-plus/id1627653061)

**Features:** macOS Compatibility

**In-app purchases:** none


### Mechanical Formula

[App page](https://appshunter.io/ios/app/mechanical-formula/id1668948373)

This app provides over 200 essential mechanical engineering formulas and calculations in a user-friendly tool. It's designed to simplify complex concepts and speed up problem-solving for students, professionals, and educators.

**Highlights:** 200+ mechanical engineering formulas, Instant calculations, Intuitive interface, Real-world application explanations, Exam preparation aid, Lifetime Premium option

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is Slope Calculator Plus free?

Slope Calculator Plus costs $2.99, with no in-app purchases.

### Is Mechanical Formula free?

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

### Do Slope Calculator Plus or Mechanical Formula have ads?

Neither Slope Calculator Plus nor Mechanical Formula shows ads.

### Which is updated more often, Slope Calculator Plus or Mechanical Formula?

Slope Calculator Plus ships an update every 23 months, and Mechanical Formula every 4 months. Most recently, Slope Calculator Plus was updated on November 3, 2026 and Mechanical Formula on November 3, 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.*