# Mechanical Dictionary vs Eng Fluids

The clearest difference is in-app purchases: Eng Fluids at none against Mechanical Dictionary's 5. Eng Fluids also leads on ads (none vs shown) and iOS requirement (9.0 vs 15.6). On price, update cadence and device support there is nothing between them.

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

Mechanical Dictionary ships an update every 9 months, Eng Fluids every 13 months. The most recent releases landed on June 6, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Mechanical Dictionary | Eng Fluids |
| --- | --- | --- |
| 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 13 months |
| Monetization | Free with in-app purchases | — |
| Size | 14 MB | 21 MB |
| Requires iOS | 15.6 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Puju Dekivadiya](https://appshunter.io/developer/1289574712) | [Kurt Gramoll](https://appshunter.io/developer/782218116) |

## 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 |


### Eng Fluids

[App page](https://appshunter.io/ios/app/eng-fluids/id1540624295)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Mechanical Dictionary free?

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

### Is Eng Fluids free?

Eng Fluids is free to download, with no in-app purchases.

### Do Mechanical Dictionary or Eng Fluids have ads?

Mechanical Dictionary shows ads; Eng Fluids does not.

### Which is updated more often, Mechanical Dictionary or Eng Fluids?

Mechanical Dictionary ships an update every 9 months, and Eng Fluids every 13 months. Most recently, Mechanical Dictionary was updated on June 6, 2026 and Eng Fluids on September 21, 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.*