# FlexTow vs Engineer's Unit Converter

The clearest difference is in-app purchases: FlexTow at none against Engineer's Unit Converter's 1. FlexTow also leads on ads (none vs shown) and update cadence (weekly vs monthly). On price and device support there is nothing between them.

Both are free to download. Engineer's Unit Converter sells 1 one-off in-app purchase. FlexTow asks for nothing beyond the download.

FlexTow ships an update weekly, Engineer's Unit Converter monthly. The most recent releases landed on October 17, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | FlexTow | Engineer's Unit Converter |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Weekly** | Monthly |
| Size | 68 MB | 7 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [9524-4620 Quebec INC](https://appshunter.io/developer/1867224867) | [Jose Gerardo Palma Duran](https://appshunter.io/developer/1873843788) |

## What reviewers say

### FlexTow

[App page](https://appshunter.io/ios/app/flextow/id6757488158)

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

**In-app purchases:** none


### Engineer's Unit Converter

[App page](https://appshunter.io/ios/app/engineers-unit-converter/id6758744042)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |


## Frequently asked questions

### Is FlexTow free?

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

### Is Engineer's Unit Converter free?

Engineer's Unit Converter is free to download, with in-app purchases available.

### Do FlexTow or Engineer's Unit Converter have ads?

Engineer's Unit Converter shows ads; FlexTow does not.

### Which is updated more often, FlexTow or Engineer's Unit Converter?

FlexTow ships an update weekly, and Engineer's Unit Converter monthly. Most recently, FlexTow was updated on October 17, 2026 and Engineer's Unit Converter on September 30, 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.*