# OPie Unit Converter — Henry & Avery's Request

> Converts 16 measurement categories simultaneously with a rotary selector. (iPhone/iPad app by Andrew Swenson.)

- Source: https://appshunter.io/ios/app/opie-unit-converter/id1570481314 (this page in markdown: same URL + `.md`)
- Developer: [Andrew Swenson](https://appshunter.io/developer/1558926423)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Rating: 5.00/5 from 5 App Store ratings
- Age rating: 4+
- Requires: iOS 14.5 · 5 MB
- Languages: American English
- Released: 2021-06-02
- Data updated: 2026-07-04
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/opie-unit-converter/id1570481314/reviews.md

## What is OPie Unit Converter?

OPie Unit Converter simultaneously converts 16 elements within the following categories: length, temperature, area, volume, weight, angle, digital storage, energy, pressure, force, time, electric current, speed, and luminance.  Future updates will add new catagories.  The OPie Unit Converter is also part of the OPie RPN Calculator (also available at the App Store).

Use the rotary selector (picker selector) to choose the category. Use the number buttons to input your desired value.  Then press one of the input buttons.

## Key features

- 16 conversion categories
- Simultaneous conversion
- Rotary selector for categories
- Supports length, temperature, area, volume, weight, angle, digital storage, energy, pressure, force, time, electric current, speed, and luminance
- Part of OPie RPN Calculator suite

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Expansion Pack | $0.99 | one-time |
| Remove Ads | $1.99 | one-time |



## Frequently asked questions about OPie Unit Converter

### What measurement categories does OPie Unit Converter support?

OPie Unit Converter supports 16 categories: length, temperature, area, volume, weight, angle, digital storage, energy, pressure, force, time, electric current, speed, and luminance. Future updates are planned to add more categories.

### How do I use OPie Unit Converter?

You use the rotary selector to choose a category, input your value using the number buttons, and then press one of the input buttons to see the converted results.

### Is OPie Unit Converter free to use?

Yes, OPie Unit Converter is available for free. It also offers in-app purchases, though the specific details of these purchases are not provided in the app description.

### What devices is OPie Unit Converter compatible with?

OPie Unit Converter is designed for iOS devices, including iPhone, iPad, and iPod. It has an age rating of 4+.

### How often is OPie Unit Converter updated?

The app was last updated on November 7, 2021, to version 1.6. The release date was June 2, 2021, indicating it receives periodic updates.

### Does OPie Unit Converter have ads?

The provided data does not specify if OPie Unit Converter contains advertisements. However, it does mention in-app purchases.

### Can OPie Unit Converter convert multiple units at once?

Yes, OPie Unit Converter is designed to simultaneously convert 16 different elements across various measurement categories, making it efficient for complex conversions.

### Is OPie Unit Converter related to other apps?

Yes, OPie Unit Converter is part of the OPie RPN Calculator suite, which is also available on the App Store. This suggests a potential for integration or a similar user interface.

## Version history (last 5 releases)

### 1.6 — 2021-11-07

-changed behavior of clear button:  if the input field has values, the clear button will clear that display.  If the input field is empty, the clear button will clear the rest of the displays.
-added ability to remove ads
-added ability to purchase an expansion pack.  Current expansion pack includes unit conversions for Power.  There will be future additions to the expansion pack including customer requests for additions.  Once you buy the expansion pack, all future additions are free.
-minor improvements to the layout and text size.

### 1.5 — 2021-09-28

fixed: a couple of layout issues
fixed: rotation issue with iPhone.  For iPhone, this app only displays in portrait.  For iPad, it displays in both portrait and landscape.

### 1.4 — 2021-06-24

Added a Luminance converter page.
Added the ability to reorder unit conversion pages or to delete unwanted conversion pages.  The default values button returns the unit converter to its initial state.

### 1.3 — 2021-06-12

Added conversions for energy, pressure, force, time, electric current, and speed.

### 1.2 — 2021-06-09

Added a digital storage category.  Email opie.swdev@yahoo.com for new category suggestions.

## Apps similar to OPie Unit Converter

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Unit Ⅽonverter](https://appshunter.io/ios/app/unit-onverter/id1499479393) | — | Free | Utilities |
| [Rpn Calculator SW](https://appshunter.io/ios/app/rpn-calculator-sw/id1542516217) | — | Free | Utilities |
| [Converter and Calculator Lite](https://appshunter.io/ios/app/converter-and-calculator-lite/id688576152) | 4.8 (83) | Free | Utilities |
| [iMeasure!Lite -Converter](https://appshunter.io/ios/app/imeasurelite-converter/id821698370) | 4.5 (2) | Free | Utilities |
| [Unit Converter Pro Max](https://appshunter.io/ios/app/unit-converter-pro-max/id6446093703) | — | Free | Utilities |
| [Double Unit Converter](https://appshunter.io/ios/app/double-unit-converter/id1451391414) | — | Free | Utilities |

## More apps by Andrew Swenson

- [OPie Isentropic Calculator](https://appshunter.io/ios/app/opie-isentropic-calculator/id1558926421)
- [OPie RPN Calculator](https://appshunter.io/ios/app/opie-rpn-calculator/id1559116337)
- [OPie RetireFIRE](https://appshunter.io/ios/app/opie-retirefire/id1562734440)
- [OPie Tip Calc](https://appshunter.io/ios/app/opie-tip-calc/id1570900875)
- [OPie Mohr's Circle](https://appshunter.io/ios/app/opie-mohrs-circle/id1581023550)

All apps by Andrew Swenson: https://appshunter.io/developer/1558926423

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-04.*