Units vs Units+
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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)
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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.
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.
- 260+ measurement units
- 22 unit categories
- 160+ currencies
- Real-time exchange rates
- Unit search
- Bookmarking conversions
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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
Verdict
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
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.
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.
Units ships an update monthly, Units+ every 5 months. Both last shipped on November 1, 2026.
| Parameter | Units | Units+ |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (51 ratings) | 4.7 (375 ratings) — better |
| Positive reviews | 60.1% of reviews | 85.0% of reviews — better |
| Number of ratings | 51 | 375 — better |
| Update frequency | Monthly — better | Every 5 months |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 15.5 — better |
| Further details — not scored | ||
| Size | 86 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Homegrown Software Ltd | Hebaallah Hossameldien |
Customer experience
Units
Units+
User reviews
Units
From 51 App Store ratingsWhat 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 ratingsWhat 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
Units
- Small Tip$0.99
- Medium Tip$2.99
- Large Tip$4.99
Units+
- Unlock Pro FeaturesFree
- Remove Ads$1.99
Questions
Is Units free?
Is Units+ free?
Which has better reviews, Units or Units+?
Do Units or Units+ have ads?
Which is updated more often, Units or Units+?
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