# Mechanical Dictionary vs LMS VJAA

The clearest difference is in-app purchases: LMS VJAA at none against Mechanical Dictionary's 5. LMS VJAA also leads on ads (none vs shown) and update cadence (every 2 months vs every 9 months). On price 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. LMS VJAA asks for nothing beyond the download.

Mechanical Dictionary ships an update every 9 months, LMS VJAA every 2 months. The most recent releases landed on October 24, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Mechanical Dictionary | LMS VJAA |
| --- | --- | --- |
| 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 2 months** |
| Monetization | Free with in-app purchases | — |
| Size | 14 MB | 65 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Puju Dekivadiya](https://appshunter.io/developer/1289574712) | [Viet Hung Nguyen](https://appshunter.io/developer/528206314) |

## 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 |


### LMS VJAA

[App page](https://appshunter.io/ios/app/lms-vjaa/id6717579980)

**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 LMS VJAA free?

LMS VJAA is free to download, with no in-app purchases.

### Do Mechanical Dictionary or LMS VJAA have ads?

Mechanical Dictionary shows ads; LMS VJAA does not.

### Which is updated more often, Mechanical Dictionary or LMS VJAA?

Mechanical Dictionary ships an update every 9 months, and LMS VJAA every 2 months. Most recently, Mechanical Dictionary was updated on October 24, 2026 and LMS VJAA on October 16, 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.*