# Mechanical Dictionary vs REO Mechanical Engineering

The clearest difference is in-app purchases: REO Mechanical Engineering at none against Mechanical Dictionary's 5. REO Mechanical Engineering also leads on ads (none vs shown). Mechanical Dictionary's advantage is update cadence (every 9 months vs every 21 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Mechanical Dictionary sells 5 in-app purchases, starting at $1.99 per 7 days. REO Mechanical Engineering asks for nothing beyond the download.

Mechanical Dictionary ships an update every 9 months, REO Mechanical Engineering every 21 months. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Mechanical Dictionary | REO Mechanical Engineering |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (5 ratings)](https://appshunter.io/ios/app/mechanical-dictionary-offline/id1480363529/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 9 months** | Every 21 months |
| Monetization | Free with in-app purchases | — |
| Size | 14 MB | 452 MB |
| Requires iOS | 15.6 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Puju Dekivadiya](https://appshunter.io/developer/1289574712) | [Rex Banggawan](https://appshunter.io/developer/1516403954) |

## What reviewers say

### Mechanical Dictionary

[App page](https://appshunter.io/ios/app/mechanical-dictionary-offline/id1480363529)

This app provides a comprehensive offline dictionary for mechanical engineering terms. It includes video lessons, tests, and expert coaching to enhance knowledge in the field. Features like search, audio pronunciation, and daily word learning are available.

**Highlights:** Offline access to thousands of terms, Search and bookmark functionality, Audio pronunciation of words, Daily 'Word of the Day' feature, Multiple choice quizzes, Customizable color themes

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Pro Plan | $1.99 | per 7 days |
| Monthly Pro Plan | $4.99 | per month |
| Yearly Pro Plan | $29.99 | per year |
| Remove Ads | $9.99 | one-time |
| Lifetime Access | $39.99 | one-time |


### REO Mechanical Engineering

[App page](https://appshunter.io/ios/app/reo-mechanical-engineering/id1616497471)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is Mechanical Dictionary free?

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

### Is REO Mechanical Engineering free?

REO Mechanical Engineering is free to download, with no in-app purchases.

### Do Mechanical Dictionary or REO Mechanical Engineering have ads?

Mechanical Dictionary shows ads; REO Mechanical Engineering does not.

### Which is updated more often, Mechanical Dictionary or REO Mechanical Engineering?

Mechanical Dictionary ships an update every 9 months, and REO Mechanical Engineering every 21 months. Most recently, Mechanical Dictionary was updated on October 24, 2026 and REO Mechanical Engineering on October 25, 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.*