# Unit Converter Engineering Pro vs Sewer Pipe Calculator

The clearest difference is iOS requirement: Unit Converter Engineering Pro at 13.0 against Sewer Pipe Calculator's 15.1. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Unit Converter Engineering Pro sells 2 in-app purchases, starting at $5.99 per 7 days and Sewer Pipe Calculator sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Unit Converter Engineering Pro ships an update weekly, Sewer Pipe Calculator every 10 days. The most recent releases landed on October 31, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Unit Converter Engineering Pro | Sewer Pipe Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/unit-converter-engineering-pro/id6757166485/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 10 days |
| Monetization | Free with in-app purchases | — |
| Size | 77 MB | 31 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kaiguri Tech](https://appshunter.io/developer/1864995084) | [Transparent Blue Water LLC](https://appshunter.io/developer/1847968351) |

## What reviewers say

### Unit Converter Engineering Pro

[App page](https://appshunter.io/ios/app/unit-converter-engineering-pro/id6757166485)

This app provides precise unit conversions for engineers, scientists, and students. It supports over 100 units across 35 categories, including scientific notation and 9-digit decimal precision. The tool works offline and adheres to SI, NIST, and ISO standards.

**Highlights:** Over 100 units in 35+ categories, Scientific notation support, 9-digit decimal precision, SI, NIST, ISO compliant, Offline functionality, Specialized units included

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 3-Day Trial | $5.99 | per 7 days |
| Yearly Plan | $19.99 | per year |


### Sewer Pipe Calculator

[App page](https://appshunter.io/ios/app/sewer-pipe-calculator/id6758410223)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SewerCalc Pro | $2.99 | one-time |
| Structures Pack | $3.99 | one-time |
| Sewer Designer | $7.99 | one-time |


## Frequently asked questions

### Is Unit Converter Engineering Pro free?

Unit Converter Engineering Pro is free to download, with in-app purchases available.

### Is Sewer Pipe Calculator free?

Sewer Pipe Calculator is free to download, with in-app purchases available.

### Do Unit Converter Engineering Pro or Sewer Pipe Calculator have ads?

Neither Unit Converter Engineering Pro nor Sewer Pipe Calculator shows ads.

### Which is updated more often, Unit Converter Engineering Pro or Sewer Pipe Calculator?

Unit Converter Engineering Pro ships an update weekly, and Sewer Pipe Calculator every 10 days. Most recently, Unit Converter Engineering Pro was updated on October 31, 2026 and Sewer Pipe Calculator on October 29, 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.*