# Wait and Weight Simulator vs Mechanical Formula

The clearest difference is price: Mechanical Formula at Free against Wait and Weight Simulator's $19.99. Wait and Weight Simulator's advantage is in-app purchases (none vs 1). On update cadence, ads, device support and iOS requirement there is nothing between them.

Mechanical Formula is free to download; Wait and Weight Simulator costs $19.99 up front. Mechanical Formula sells 1 one-off in-app purchase. Wait and Weight Simulator asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on October 19, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Wait and Weight Simulator | Mechanical Formula |
| --- | --- | --- |
| Price | $19.99 | **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 4 months | Every 4 months |
| Monetization | — | Free with in-app purchases |
| Size | 19 MB | 42 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Carlos Moura](https://appshunter.io/developer/407501202) | [Kantaben Gorasiya](https://appshunter.io/developer/1640260396) |

## What reviewers say

### Wait and Weight Simulator

[App page](https://appshunter.io/ios/app/wait-and-weight-simulator/id1443043006)

**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 Wait and Weight Simulator free?

Wait and Weight Simulator costs $19.99, with no in-app purchases.

### Is Mechanical Formula free?

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

### Do Wait and Weight Simulator or Mechanical Formula have ads?

Neither Wait and Weight Simulator nor Mechanical Formula shows ads.

### Which is updated more often, Wait and Weight Simulator or Mechanical Formula?

Wait and Weight Simulator ships an update every 4 months, and Mechanical Formula every 4 months. Most recently, Wait and Weight Simulator was updated on October 19, 2026 and Mechanical Formula on October 24, 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.*