# Topical Dictionary vs Mechanical Engineering Lab

The clearest difference is price: Topical Dictionary at Free against Mechanical Engineering Lab's $2.99. Mechanical Engineering Lab's advantage is iOS requirement (17.0 vs 26.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

Topical Dictionary is free to download; Mechanical Engineering Lab costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Topical Dictionary ships an update fortnightly, Mechanical Engineering Lab monthly. The most recent releases landed on September 9, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Topical Dictionary | Mechanical Engineering Lab |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Monthly |
| Monetization | Ad-supported | — |
| Size | 19 MB | 5 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Ibrahim Ethem Karali](https://appshunter.io/developer/1572105335) | [Yuhsiu Lai](https://appshunter.io/developer/433114647) |

## What reviewers say

### Topical Dictionary

[App page](https://appshunter.io/ios/app/topical-dictionary/id1572105333)

Easily create custom dictionaries with over 400,000 words, descriptions, and examples. Ideal for expanding vocabulary while reading, researching, or watching media in English. Offers a dedicated tool for word study, superior to generic note-taking apps.

**Highlights:** Create custom dictionaries, Over 400,000 words, Word descriptions and examples, Vocabulary expansion tool, Dedicated word study

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

**In-app purchases:** none


### Mechanical Engineering Lab

[App page](https://appshunter.io/ios/app/mechanical-engineering-lab/id6766063704)

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

**In-app purchases:** none


## Frequently asked questions

### Is Topical Dictionary free?

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

### Is Mechanical Engineering Lab free?

Mechanical Engineering Lab costs $2.99, with no in-app purchases.

### Do Topical Dictionary or Mechanical Engineering Lab have ads?

Neither Topical Dictionary nor Mechanical Engineering Lab shows ads.

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

Topical Dictionary ships an update fortnightly, and Mechanical Engineering Lab monthly. Most recently, Topical Dictionary was updated on September 9, 2026 and Mechanical Engineering Lab on September 17, 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.*