Comparison

Unit Converter vs Plain Units

Price, ratings, monetisation and update history for both apps, side by side β€” with what reviewers say about each.

Head to head
About

Unit Converter

Features
Read full description

A simple and easy-to-use unit converter app. Quickly and accurately convert commonly used units such as length, weight, temperature, area, volume, and speed. Just enter a number and it will automatically convert to the selected unit in real time. With a clean UI and history feature, anyone can use it intuitively. ● Key Features [Instant Unit Conversion] - Automatically converts as you type - Supports length / weight / temperature / area / volume / speed - Quickly select commonly used units - Real-time results [Supported Units] - Length: centimeter / meter / inch / foot, etc. - Weight: gram / kilogram / ounce / pound, etc. - Temperature: Celsius (℃) / Fahrenheit (℉) - Area: square meter / square foot / square mile / are, etc. - Volume: liter / milliliter / gallon, etc. - Speed: km/h / mph, etc. [Simple and Clean UI] - Minimal design focused on essential information - Large, easy-to-read text - Intuitive one-tap unit switching [Flexible History Management] - View conversion history in a list - Supports automatic or manual saving - Easily copy or delete history items [Quick Copy Feature] - Copy conversion results with a single tap [Customizable Settings] - Adjust decimal precision - Enable/disable haptic feedback - Choose how history is recorded [No Login Required] - No account needed β€” start using immediately From everyday calculations to work and study, enjoy a simple and stress-free unit conversion experience.

About

Plain Units

Features
Read full description

Simple Unit Converter is a calm, numeric-first converter that gets out of your way. Pick a category, type into any field, and every other unit on the page updates instantly. No account, no sign-in, no clutter. 14 CATEGORIES β€’ Length β€’ Mass β€’ Temperature β€’ Time β€’ Speed β€’ Area β€’ Volume β€’ Digital Storage β€’ Data Transfer Rate β€’ Energy β€’ Frequency β€’ Fuel Economy β€’ Plane Angle β€’ Pressure WHY YOU'LL LIKE IT β€’ Type into any unit, not just a "from" box. Every other unit converts as you type. β€’ All units in a category are visible at once, so you never dig through pickers. β€’ Searchable category grid to jump straight to what you need. β€’ Tap a result to copy a clean, paste-ready value. β€’ Remembers your last category, unit, and value between launches. β€’ Light and dark mode, and works on iPhone and iPad. β€’ Everything runs on your device. No servers, no analytics, no tracking of your conversions. REMOVE ADS The free version shows ads. A one-time purchase removes them forever and restores on all your devices signed in to the same Apple Account.

Screenshots

Unit Converter4 screens
Plain Units4 screens

Verdict

The call

The clearest difference is in-app purchases: Unit Converter at none against Plain Units's 1. Plain Units's advantage is update cadence (every 3 weeks vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. Plain Units sells 1 one-off in-app purchase. Unit Converter asks for nothing beyond the download.

UpkeepUpdate frequency

Unit Converter ships an update every 2 months, Plain Units every 3 weeks. Both last shipped on October 31, 2026.

Scorecard2 real differences Β· 4 level
Unit Converter versus Plain Units: the parameters behind the verdict, then further details
ParameterUnit ConverterPlain Units
PriceFreeFree
Update frequencyEvery 2 monthsEvery 3 weeks β€” better
AdsYesYes
In-app purchasesNo β€” betterYes
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.616.4 β€” better
Further details β€” not scored
Size11 MB48 MB
Age rating4+4+
DeveloperMITSUKO MARGOT KUBOTA ONONicolaus Lawson

In-app purchases

None

Unit Converter

No in-app purchases

1 purchases

Plain Units

One-time1
  • Remove Ads$3.99

Questions

Is Unit Converter free?
Unit Converter is free to download, with no in-app purchases.
Is Plain Units free?
Plain Units is free to download, with in-app purchases available.
Do Unit Converter or Plain Units have ads?
Both Unit Converter and Plain Units show ads.
Which is updated more often, Unit Converter or Plain Units?
Unit Converter ships an update every 2 months, and Plain Units every 3 weeks. Most recently, Unit Converter was updated on October 31, 2026 and Plain Units on October 31, 2026.

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