# Mechanical Dictionary Offline vs Engineering Formulas

The clearest difference is in-app purchases: Mechanical Dictionary Offline at none against Engineering Formulas's 3. Mechanical Dictionary Offline also leads on iOS requirement (7.0 vs 15.1). On price, ads and device support there is nothing between them.

Both are free to download. Engineering Formulas sells 3 in-app purchases, starting at $4.99 per 7 days. Mechanical Dictionary Offline asks for nothing beyond the download.

## The numbers

| Metric | Mechanical Dictionary Offline | Engineering Formulas |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 2 months |
| Size | 16 MB | 45 MB |
| Requires iOS | **7.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Andrew Putranto](https://appshunter.io/developer/1097285857) | [Mobin Akhter](https://appshunter.io/developer/1812505286) |

## What reviewers say

### Mechanical Dictionary Offline

[App page](https://appshunter.io/ios/app/mechanical-dictionary-offline/id1172630838)

**In-app purchases:** none


### Engineering Formulas

[App page](https://appshunter.io/ios/app/engineering-formulas-engiref/id6758258119)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $4.99 | per 7 days |
| Yearly Premium | $29.99 | per year |
| Lifetime Access | $54.99 | one-time |


## Frequently asked questions

### Is Mechanical Dictionary Offline free?

Mechanical Dictionary Offline is free to download, with no in-app purchases.

### Is Engineering Formulas free?

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

### Do Mechanical Dictionary Offline or Engineering Formulas have ads?

Neither Mechanical Dictionary Offline nor Engineering Formulas shows ads.

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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.*