# Driller's Method Worksheets vs Unit Ⅽonverter

The clearest difference is price: Unit Ⅽonverter at Free against Driller's Method Worksheets's $19.99. Unit Ⅽonverter also leads on update cadence (every 3 weeks vs every 4 months). Driller's Method Worksheets's advantage is in-app purchases (none vs 2) and ads (none vs shown). On device support there is nothing between them.

Unit Ⅽonverter is free to download; Driller's Method Worksheets costs $19.99 up front. Unit Ⅽonverter sells 2 in-app purchases, starting at $1.99 per month. Driller's Method Worksheets asks for nothing beyond the download.

Driller's Method Worksheets ships an update every 4 months, Unit Ⅽonverter every 3 weeks. Both last shipped on October 12, 2026.

## The numbers

| Metric | Driller's Method Worksheets | Unit Ⅽonverter |
| --- | --- | --- |
| Price | $19.99 | **Free** |
| Positive reviews | — | 25.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 10 MB | 8 MB |
| Requires iOS | **15.6** | 18.0 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Carlos Moura](https://appshunter.io/developer/407501202) | [Polymath Company Limited](https://appshunter.io/developer/1072350394) |

## What reviewers say

### Driller's Method Worksheets

[App page](https://appshunter.io/ios/app/drillers-method-worksheets/id1069961915)

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

**In-app purchases:** none


### Unit Ⅽonverter

[App page](https://appshunter.io/ios/app/unit-onverter/id1499479393)

Easily convert between over 1600 units of measurement across 75 categories, including custom units and complex calculations. Supports offline mode and offers a convenient history of your conversions.

**Highlights:** Convert over 1600 units in 75 categories, Supports custom units and combinations, Calculator for expression input, View conversion histories, Add favorite units, Offline mode, Copy and share results

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| UnitConverterPremiumMonthly | $1.99 | per month |
| UnitConverterPremiumLifeTime | $33.99 | one-time |


## Frequently asked questions

### Is Driller's Method Worksheets free?

Driller's Method Worksheets costs $19.99, with no in-app purchases.

### Is Unit Ⅽonverter free?

Unit Ⅽonverter is free to download, with in-app purchases available.

### Do Driller's Method Worksheets or Unit Ⅽonverter have ads?

Unit Ⅽonverter shows ads; Driller's Method Worksheets does not.

### Which is updated more often, Driller's Method Worksheets or Unit Ⅽonverter?

Driller's Method Worksheets ships an update every 4 months, and Unit Ⅽonverter every 3 weeks. Most recently, Driller's Method Worksheets was updated on October 12, 2026 and Unit Ⅽonverter on October 12, 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.*