# TLV ToolBox vs Mechanical Engineering Toolkit

The clearest difference is in-app purchases: TLV ToolBox at none against Mechanical Engineering Toolkit's 1. TLV ToolBox also leads on ads (none vs shown) and review sentiment (75% vs 57%). Mechanical Engineering Toolkit's advantage is update cadence (every 8 days vs every 4 months) and rating (4.8 vs 4.5). On price and device support there is nothing between them.

Both are free to download. Mechanical Engineering Toolkit sells 1 one-off in-app purchase. TLV ToolBox asks for nothing beyond the download.

Mechanical Engineering Toolkit holds the better App Store score, 4.8 against 4.5. That said, the two scores are not equally well evidenced: Mechanical Engineering Toolkit has 64 ratings behind it against 8, so its average is the more settled of the two. Written reviews complicate that: 75% of TLV ToolBox's written reviews are positive against 57% of Mechanical Engineering Toolkit's, so the app with the better star average is not the one people write more warmly about.

TLV ToolBox ships an update every 4 months, Mechanical Engineering Toolkit every 8 days. The most recent releases landed on June 6, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | TLV ToolBox | Mechanical Engineering Toolkit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (8 ratings)](https://appshunter.io/ios/app/tlv-toolbox/id653406777/reviews) | **[4.8 (64 ratings)](https://appshunter.io/ios/app/mechanical-engineering-toolkit/id1601099443/reviews)** |
| Number of ratings | 8 | **64** |
| Positive reviews | **75.0% of reviews** | 57.1% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 8 days** |
| Monetization | **Free** | Ad-supported |
| Size | 4 MB | 38 MB |
| Requires iOS | **9.3** | 15.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [TLV CO.,LTD.](https://appshunter.io/developer/653406780) | [APPS BAY LIMITED](https://appshunter.io/developer/1599035519) |

## What reviewers say

### TLV ToolBox

[App page](https://appshunter.io/ios/app/tlv-toolbox/id653406777)

This utility app transforms your mobile device into a portable steam calculation tool. It assists with onsite calculations for control valve stations, condensate recovery systems, and various maintenance tasks, reducing the need for multiple trips.

**Highlights:** Steam Tables (saturated and superheated), Steam Pipe Sizing, Condensate Pipe Sizing, Heating Calculations, Cv and Kv Values, Stall Point

**Features:** macOS Compatibility

**In-app purchases:** none


### Mechanical Engineering Toolkit

[App page](https://appshunter.io/ios/app/mechanical-engineering-toolkit/id1601099443)

This utility app provides a comprehensive collection of engineering equations and formulas for students and professionals. Easily perform calculations by selecting a formula and inputting variables, with detailed instructions and reference material included.

**Highlights:** Engineering equations and formulas, Mechanics of Material calculations, Theory of Elasticity formulas, Composite Material properties, Reference material, Variable input for calculations

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


## Frequently asked questions

### Is TLV ToolBox free?

TLV ToolBox is free to download, with no in-app purchases.

### Is Mechanical Engineering Toolkit free?

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

### Which has better reviews, TLV ToolBox or Mechanical Engineering Toolkit?

Mechanical Engineering Toolkit is rated higher. TLV ToolBox averages 4.5 out of 5 from 8 ratings, while Mechanical Engineering Toolkit averages 4.8 from 64 ratings.

### Do TLV ToolBox or Mechanical Engineering Toolkit have ads?

Mechanical Engineering Toolkit shows ads; TLV ToolBox does not.

### Which is updated more often, TLV ToolBox or Mechanical Engineering Toolkit?

TLV ToolBox ships an update every 4 months, and Mechanical Engineering Toolkit every 8 days. Most recently, TLV ToolBox was updated on June 6, 2026 and Mechanical Engineering Toolkit on September 24, 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.*