Comparison

Units vs Units+

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

Head to head
About

Units

Easily convert between hundreds of units across 43 categories, including currency with daily updated rates. Customize your workflow by hiding or reordering units and categories.

Highlights
  • Hundreds of units across 43 categories
  • Daily updated currency exchange rates
  • Hide unused units
  • Reorder units and categories
  • Universal app support (iPhone, iPod touch, iPad)
Features
Read full description

Units is the fast, friendly unit converter. Type a number into any unit and instantly see it in every other one, all on a single screen. There's no picking what to convert from and to, no digging through menus, and no ads. With more than 800 units across 43 categories, Units covers everyday conversions like length, weight, volume and temperature, and the ones you need less often, from torque and fuel consumption to data rates, shoe sizes and musical notes. SEE EVERYTHING AT ONCE • Enter a value in any unit and every other unit in the category updates as you type • A keypad made for numbers, so the decimal point is always right where you need it CURRENCY • Convert between more than 160 currencies • Exchange rates updated every day MAKE IT YOURS • Hide the units you never use, so the ones you need are always in view • Reorder units and categories so your favorites come first • Switch on a two-column layout to see even more at a glance • Leave a tip to unlock a collection of alternative app icons MADE FOR YOUR DEVICES • Designed for iPhone and iPad, with your categories and conversion side by side on larger screens • Makes full use of iPhone Duo, whether it's open or closed • Handoff picks up a conversion where you left off on another device • Supports Dark Mode and Dynamic Type Units has been converting since 2008, and is lovingly made in Scotland.

About

Units+

Easily convert between over 260 measurement units across 22 categories and get real-time currency exchange rates for more than 160 currencies. Quickly find units or bookmark frequent conversions for efficient use.

Highlights
  • 260+ measurement units
  • 22 unit categories
  • 160+ currencies
  • Real-time exchange rates
  • Unit search
  • Bookmarking conversions
Features
Read full description

Convert values between commonly used measurement units. The app supports more than 260 units in 22 different categories. It also support currency exchange rates for more than 160 currencies. The app makes it easy to search for units within a specific category, or across all categories. And supports bookmarking the conversions you use most often. Here is a sorted list of all included unit categories: - Acceleration - Angle - Area - Data Storage - Data Transfer - Density - Electric Current - Energy - Flow - Force - Fuel Consumption - Length - Mass (Weight) - Mass Flow - Metric Prefix - Power - Pressure - Speed (Velocity) - Temperature - Time - Torque - Volume

Screenshots

Units4 screens
Units+4 screens

Verdict

The call

The clearest difference is rating: Units+ at 4.7 against Units's 4.1. Units+ also leads on review sentiment (85% vs 60%) and ratings volume (375 vs 51). Units's advantage is update cadence (monthly vs every 5 months). On price, ads, in-app purchases and monetization model there is nothing between them.

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Units sells 3 one-off in-app purchases and Units+ sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Units+ holds the better App Store score, 4.7 against 4.1. That said, the two scores are not equally well evidenced: Units+ has 375 ratings behind it against 51, so its average is the more settled of the two. Written reviews point the same way: 60% of Units's written reviews are positive against 85% of Units+'s.

UpkeepUpdate frequency

Units ships an update monthly, Units+ every 5 months. Both last shipped on November 1, 2026.

Scorecard5 real differences · 5 level
Units versus Units+: the parameters behind the verdict, then further details
ParameterUnitsUnits+
PriceFreeFree
Rating4.1 (51 ratings)4.7 (375 ratings) — better
Positive reviews60.1% of reviews85.0% of reviews — better
Number of ratings51375 — better
Update frequencyMonthly — betterEvery 5 months
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.015.5 — better
Further details — not scored
Size86 MB4 MB
Age rating4+4+
DeveloperHomegrown Software LtdHebaallah Hossameldien

Customer experience

Units

All ratings49 ratings
Positive79.6%
Neutral4.1%
Negative16.3%
Written reviews581 reviews
Positive60.1%
Neutral12.0%
Negative27.9%

Units+

All ratings375 ratings
Positive94.1%
Neutral4.3%
Negative1.6%
Written reviews20 reviews
Positive85.0%
Neutral0.0%
Negative15.0%

User reviews

Units

From 51 App Store ratings

What we love

  • 🚀 Efficient and fast conversions
  • 👍 Comprehensive list of units
  • 🔍 Customizable unit selection
  • 💰 Free app with optional paid version
  • 🔧 Useful for engineering and technical work

Room to improve

  • 🐛 Crashes and stability issues
  • 🕰️ Outdated currency conversion rates
  • 🔍 Too many unit categories, hard to navigate
  • 💰 Ads in free version
  • 📏 Ruler feature not accurate on some devices

Units+

From 375 App Store ratings

What we love

  • 👍 Easy to use
  • 👍 Reliable tool
  • 👍 Versatile converter
  • 👍 Great for various conversions (mass, temps, currency, distances)
  • 👍 Does what it needs to do

Room to improve

  • 😠 Too many ads
  • 😠 Ads without an X to close
  • 😠 Negative sentiment towards the app's creator/provider (implied by one review)
  • 😐 Fuel economy display issues (mpg/liters to 100)
  • 😐 Some discrepancy in currency accuracy noted

Bugs and requests

Units

Reported bugs

4 issues
  • Crashes when clearing input fields
  • Numerical keypad covers conversion results
  • Incompatibility issues with newer iOS versions
  • Ruler measurements not accurate on all devices

Requested features

5 requests
  • Add nautical units (miles, knots)
  • Improve currency conversion accuracy and updates
  • Allow customization of visible unit categories
  • Add more clothing/shoe size conversions
  • Improve user interface and search functionality

Units+

Reported bugs

1 issue
  • Ads don't have an X to close

Requested features

2 requests
  • Add a Notification Center widget
  • Way to mark favorite types of conversions

In-app purchases

3 purchases

Units

One-time3
  • Small Tip$0.99
  • Medium Tip$2.99
  • Large Tip$4.99
2 purchases

Units+

One-time2
  • Unlock Pro FeaturesFree
  • Remove Ads$1.99

Questions

Is Units free?
Units is free to download, with in-app purchases available.
Is Units+ free?
Units+ is free to download, with in-app purchases available.
Which has better reviews, Units or Units+?
Units+ is rated higher. Units averages 4.1 out of 5 from 51 ratings, while Units+ averages 4.7 from 375 ratings.
Do Units or Units+ have ads?
Both Units and Units+ show ads.
Which is updated more often, Units or Units+?
Units ships an update monthly, and Units+ every 5 months. Most recently, Units was updated on November 1, 2026 and Units+ on November 1, 2026.

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