# Unit Converter 2021 — unit conversion 2020

> Intuitive unit converter with clear display of unit names and abbreviations. (iPhone/iPad app by 巧春 魏.)

- Source: https://appshunter.io/ios/app/unit-converter-2021/id1515666116 (this page in markdown: same URL + `.md`)
- Developer: [巧春 魏](https://appshunter.io/developer/1495760947)
- Category: Utilities, Reference
- Price: Free with in-app purchases
- Rating: 4.70/5 from 408 App Store ratings · 62 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 58 MB
- Languages: American English, Arabic, Croatian, Czech, Danish, Dutch, Finnish, French (France), German (Germany), Greek and 19 more
- Released: 2020-10-01
- Data updated: 2026-08-13
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/unit-converter-2021/id1515666116/reviews.md

## What is Unit Converter 2021?

"Eliminate confusion." This is our top priority when designing Unit Converter application.

We understand that this is a noisy world — those unit categories and unit abbreviations are already confusing enough. You need a high signal-to-noise ratio tool — this unit conversion tool is here to make your life easier.

As a normal user, at first we just want to find a unit converter that does its job: convert units. However, disappointed by the top 30 unit converters on the market, we decided to make one on my own. The problem is, none of the existing converters handle properly and simultaneously the conflicts of:

- unit full name and unit abbreviation:
Most of the unit converters on the market don’t show information such as kg is short for kilogram, oz is short for ounce,lbs is short for pounds. Even if some of them do show unit full name and unit abbreviation, they show it in an awful way.

- user experience and advertising:
Some of the existing unit converters have poor usability because of ads. One example is placing interstitial ads between unit category page and unit conversion page, this causes serious user experience issues, could even infuriate a user.

- commonly used units and professionally used units.
All of the unit converters on the market are at one of the two extremes: they target either too much or too few unit categories. Some of them only include weight unit, length unit, temperature unit and volume unit, while some of them try to include everything: power unit, pressure unit, energy unit, force unit, torque unit, frequency unit, and the list goes on and on.

Most of these unit converters have a complicated navigation system, a lot of times we got lost in their unit conversion process.

With our unit conversion tool, you can easily convert commonly used units such as cm to inches, kg to lbs (kilogram to pounds), ounces to gram, km/h to mph, Celsius to Fahrenheit (of course Fahrenheit to Celsius).

The unit calculator achieves this goal by:

- exploiting scrollable lists to limit invalid information:
In this way, users don’t get the distraction of undesired units of measurement, for example, if you want to convert cm to inches (centimeter to inches), you only need to focus on centimeter and inch in two separated lists, no need to pay attention to invalid information such as meter to feet, or kilometer to miles; we can also take converting gram to oz (ounce) for example, in this case you don’t need to pay attention to converting kg to lbs (kilogram to pounds) or ton to lbs (tonne to pounds).

- utilizing responsive buttons to react to user input:
These buttons show what the unit abbreviations are — for example kg is short for kilogram, lbs is short for pounds, cm is short for centimeter — when you click them, it will bring you to where it’s located in the scrollable list, it’s very responsive! Try it, you’ll love it!

- applying a simple layout to navigate between screens.

To make the unit conversion tool easy to use, the unit categories are sorted by frequency of use, rather than alphabetical order. So weight units, length units, volume units and temperature units are ranked ahead of speed units, power units and pressure units.

This usability principle is also adopted in the unit converting equation — commonly used measure units are placed at more visible areas. So kilogram (kg), gram (g), oz (ounce) and lbs (pound) are ranked ahead of tonne (ton), milligram (mg) and oz t (troy ounce), thus you can convert kg to lbs, or g to oz easily; centimeter (cm), millimeter (mm), inches (in) and mile (mi) are ranked ahead of nautical mile (nmi) and nanometer (nm), thus you can convert cm to inches, or km to miles easily.

If you have any questions, please send emails to:
	app@1m1000mm.com

## Key features

- Clear display of unit names and abbreviations
- Scrollable lists to limit distractions
- Responsive buttons for unit selection
- Simple and easy-to-navigate layout
- Converts common units (length, weight, temperature)

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Premium Version | $0.99 | one-time |


## What do users think of Unit Converter 2021?

Overall sentiment: positive

**Pros**

- 👍 Simple and intuitive user interface
- 🎨 Clean, attractive design
- ⚡ Fast and accurate conversions
- 💰 Affordable ad-free premium option
- 📱 Easy to navigate and use
- 🔄 Reliable conversion functionality

**Cons**

- 🐛 Ads persist after purchasing premium
- 🐛 App crashes or won't open after purchase
- ❌ Missing support/broken support links
- 📊 Limited unit categories compared to needs
- 🔧 Lacks customization options (themes, colors)
- ⚠️ Calculation accuracy issues reported

**Commonly reported bugs**

- Premium purchase doesn't remove ads
- App won't open after paid purchase
- Comma decimal separator not recognized in length section
- Incorrect conversion calculations (e.g., 180cm conversion)
- Advanced features don't work after purchase
- Missing units in pressure section (hectopascals, millibars)

**Most requested features**

- Currency conversion
- Grain unit in weight measurements
- Time/duration conversion
- Dark mode and theme customization
- Favorite/saved conversions
- KSI unit in pressure section
- Hectares and agrarian measurements
- Energy conversion (watts to calories)
- Fractional inch conversions (1/16, 3/16, etc.)
- Decimeter (dm) unit
- PPM unit
- Larger font size option
- Cleaner display showing only selected units
- Reverse/swap unit conversion button

## Recent user reviews (10 of 62)

All indexed reviews: https://appshunter.io/ios/app/unit-converter-2021/id1515666116/reviews.md

### 4/5 — .

*2026-06-07*

Здравствуйте, приложение отличное но добавьте пожалуйста время

### 3/5 — Предложение по улучшению

*2026-04-01*

В категории давления зачем то есть кг/м3 , но нет кг/см3. Так же было замечательно если переводила трубные диаметры метрическая система и дюймовая.

### 5/5 — Очень удобное приложение

*2026-03-14*

Очень простое, но очень удобное приложение. Спасибо большое разработчику

### 3/5 — Оплата приложение

*2025-12-24*

После оплаты, так и осталось предложение, снова его приобрести. Реклама не убралась

### 4/5 — 评论

*2025-05-18*

很好

### 5/5 — Simple and better for my needs

*2025-01-15*

Hav only played with this app a few times and seems easy to navigate.

### 5/5 — APK

*2024-11-26*

Es una aplicación práctica y muy útil . Además mucha de esta información está disponible en internet y está APK ahorra tiempo , desde el punto de vista estético y de diseño está excelente ya que muestra lo q se necesita preciso y exacto

### 5/5 — Хорошее приложение

*2024-11-13*

Всё понравилось. Хотелось бы увидеть возможность настраивать цвета либо темы.

### 5/5 — الوقت

*2024-10-05*

لايوجد تحويل الساعه من 12 إلى 24 او العكس

### 5/5 — Ottima app

*2024-08-30*

Ottima app

## Frequently asked questions about Unit Converter 2021

### What does this unit converter app do?

This app is designed to make unit conversions simple and intuitive. It aims to eliminate confusion by clearly displaying unit names and their abbreviations, and by providing a streamlined user experience. You can easily convert common units for length, weight, and temperature without unnecessary distractions.

### What are the key features of this unit converter?

Key features include a clear display of unit full names and abbreviations, scrollable lists that limit distractions by showing only relevant units, and responsive buttons that help users quickly find and select units. The app also boasts a simple layout for easy navigation between screens.

### How does this app handle ads and user experience?

The app prioritizes user experience by minimizing intrusive ads. Unlike some other converters that use interstitial ads, this app aims for a smoother interaction. It also uses a simple layout and focused lists to prevent users from getting lost during the conversion process.

### What types of units can I convert with this app?

The app focuses on commonly used units, making it ideal for everyday conversions. You can easily convert between units of length (e.g., cm to inches), weight (e.g., kg to lbs, ounces to gram), and temperature (e.g., Celsius to Fahrenheit, Fahrenheit to Celsius).

### Is this app free to use?

The app is available for free, but it does include in-app purchases and advertisements. This model allows users to access basic conversion functionalities without upfront cost, while offering optional purchases for enhanced features or an ad-free experience.

## Version history (last 5 releases)

### 1.33 — 2021-04-01

- update storelisting

### 1.32 — 2021-03-29

- add reorderable listview

### 1.30 — 2021-02-08

- add pressure-bar

### 1.28 — 2021-01-23

- updated store listing

### 1.27 — 2020-12-28

- optimized UI - font size

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All apps by 巧春 魏: https://appshunter.io/developer/1495760947

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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 2026-08-13.*