# Units Free

> Unit conversion tool for metric, imperial, and other systems across multiple categories. (iPhone/iPad app by Piet Jonas.)

- Source: https://appshunter.io/ios/app/units-free/id510615778 (this page in markdown: same URL + `.md`)
- Developer: [Piet Jonas](https://appshunter.io/developer/288060167)
- Category: Utilities, Reference
- Price: Free with in-app purchases
- Rating: 1.00/5 from 1 App Store ratings · 15 written reviews indexed
- Age rating: 4+
- Requires: iOS 5.1.1 · 3 MB
- Languages: American English
- Released: 2012-03-24
- Data updated: 2026-08-15
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/units-free/id510615778/reviews.md

## What is Units Free?

Convert between many units from several categories and different unit systems (metric, imperial, ...).

Features:
- categories: length, temperature, capacity, weight, energy, power, pressure, area
- access previous conversions from the history list
- categories have different colors (in the history as well)
- flip units 
- send calculations by email
- support for the iPhone 6 and 6+
- support for the iPad multitasking (split view..)



(Free version: requires upgrade to arbitrarily switch categories)

## Key features

- Multiple unit categories (length, temp, weight, etc.)
- Metric and imperial system support
- Conversion history list
- Send calculations via email
- iPad multitasking support

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Units Free Upgrade | $0.99 | one-time |


## Recent user reviews (10 of 15)

All indexed reviews: https://appshunter.io/ios/app/units-free/id510615778/reviews.md

### 2/5 — Only one category available...

*2015-03-12*

...In the free version. Therefore I deleted it

### 1/5 — Schlecht

*2014-06-20*

Suche was anderes das hier ist nichts.

### 1/5 — Hauptsache Geld!

*2014-03-21*

Hauptsache man kann für jede Kategorie Geld einheimsen. Danke, aber nein danke!

### 1/5 — Wichtige (erhoffte) Einheiten nur durch Kauf möglich!

*2014-02-04*

Schade, dass man für jede kleine Leistung direkt Geld verlangen muss... :(

### 1/5 — Schrott

*2013-12-18*

Die App ist ein Betrug und verdient nicht mal 1 Stern. Will sofort ein Upgrade

### 1/5 — Man muss Upgrades kaufen

*2013-03-26*

Leider kann man nicht mal Temperaturen umrechnen lassen ohne ein Upgradr kaufen zu müssen..

### 1/5 — Don't bother

*2013-01-06, version 1.2.1*

Gives you a select few choices, you have to upgrade, ie pay, to get the most popular conversions people require.

### 1/5 — Unbrauchbar

*2012-11-21*

Einfach nur Schrott

### 1/5 — This app isn't free it will only convert temp for free the rest you have to pay for

*2012-10-17, version 1.1.0*

This app isn't free it will only convert temp for free the rest you have to pay for

### 1/5 — Not free

*2012-10-17*

Have to buy to unlock other units

## Frequently asked questions about Units Free

### What units can Units Free convert?

Units Free supports conversions for length, temperature, capacity, weight, energy, power, pressure, and area. It handles both metric and imperial systems.

### Does Units Free have ads?

No, Units Free does not contain advertisements. It is a free application with optional in-app purchases for enhanced features.

### How do I access past conversions in Units Free?

Units Free provides a history list where you can access your previous conversions. These conversions are also color-coded by category for easier identification.

### What devices does Units Free support?

Units Free is designed for Apple devices, including iPhone, iPad, and iPod. It also supports iPad multitasking features like split view.

### Is there a cost to use Units Free?

Units Free is available for free. However, an upgrade is required to arbitrarily switch between all available categories.

### How often is Units Free updated?

The latest version, 1.6.0, was released on November 24, 2015. The app was initially released on March 24, 2012.

### What is the age rating for Units Free?

Units Free has an age rating of 4+, making it suitable for a wide range of users.

### Can I send my calculations from Units Free?

Yes, you can send your calculations directly via email from within the Units Free application.

## Version history (last 5 releases)

### 1.6.0 — 2015-11-24

This app has been updated by Apple to display the Apple Watch app icon.

- support for the iPad multitasking (split view..)

### 1.5.0 — 2015-03-05

- support for the iPhone 6 and 6+
- enhanced for iOS 8

### 1.4.0 — 2014-02-21

New units:
- nautical mile
- troy ounce
- carat

### 1.3.0 — 2013-12-18

- send your calculations by email

### 1.2.2 — 2013-01-19

- new capacity units: cubic foot, oil barrel

## Apps similar to Units Free

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Units Calculator](https://appshunter.io/ios/app/units-calculator/id6742182706) | — | Free | Utilities |
| [Pro Unit Converter](https://appshunter.io/ios/app/pro-unit-converter/id6452273430) | — | Free | Utilities |
| [1Tap Time Counter](https://appshunter.io/ios/app/1tap-time-counter/id6744562456) | — | Free | Utilities |
| [ConvertX - Currency Converter](https://appshunter.io/ios/app/convertx-currency-converter/id424562537) | 5.0 (1) | Free | Utilities |
| [Unit Converter for Physics](https://appshunter.io/ios/app/unit-converter-for-physics/id6745997040) | — | Free | Utilities |
| [Universal Converter Prime](https://appshunter.io/ios/app/universal-converter-prime/id6476938150) | — | Free | Utilities |

## More apps by Piet Jonas

- [Game Counter](https://appshunter.io/ios/app/game-counter/id288060164)
- [Workout](https://appshunter.io/ios/app/workout/id288240647)
- [Compass](https://appshunter.io/ios/app/compass/id288420566)
- [Contact Find](https://appshunter.io/ios/app/contact-find/id290153951)
- [Thesaurus App](https://appshunter.io/ios/app/thesaurus-app/id291362860)
- [Baseball Games](https://appshunter.io/ios/app/baseball-games/id291533429)

All apps by Piet Jonas: https://appshunter.io/developer/288060167

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*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 2026-08-15.*