# Molecular Weight Calculator vs mechanical design engine

The clearest difference is price: mechanical design engine at Free against Molecular Weight Calculator's $2.99. mechanical design engine also leads on update cadence (every 2 months vs every 29 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

mechanical design engine is free to download; Molecular Weight Calculator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Molecular Weight Calculator ships an update every 29 months, mechanical design engine every 2 months. The most recent releases landed on October 15, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Molecular Weight Calculator | mechanical design engine |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/molecular-weight-calculator/id1444836038/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 29 months | **Every 2 months** |
| Monetization | Paid | — |
| Size | 1 MB | 63 MB |
| Requires iOS | 13 | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [gan dae choi](https://appshunter.io/developer/1574341439) |

## What reviewers say

### Molecular Weight Calculator

[App page](https://appshunter.io/ios/app/molecular-weight-calculator/id1444836038)

This tool calculates the average molecular weight of molecules using their chemical formulas. It offers instant results, supports high precision, and is optimized for everyday use on iOS devices. The app prioritizes user privacy and is ad-free.

**Highlights:** Instant molecular weight calculation, Copy results to other apps, Includes formula references, Supports up to 16 decimal places, Works on iPhone and iPad, Ad-free and privacy-focused

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

**In-app purchases:** none


### mechanical design engine

[App page](https://appshunter.io/ios/app/mechanical-design-engine/id1574341437)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Molecular Weight Calculator free?

Molecular Weight Calculator costs $2.99, with no in-app purchases.

### Is mechanical design engine free?

mechanical design engine is free to download, with no in-app purchases.

### Do Molecular Weight Calculator or mechanical design engine have ads?

Neither Molecular Weight Calculator nor mechanical design engine shows ads.

### Which is updated more often, Molecular Weight Calculator or mechanical design engine?

Molecular Weight Calculator ships an update every 29 months, and mechanical design engine every 2 months. Most recently, Molecular Weight Calculator was updated on October 15, 2026 and mechanical design engine on October 11, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*