Best Android Unit Converter App: Is unitMeasure Worth Buying?
If your main requirement is a unit converter that works with no internet connection, shows no ads, and asks for no permissions, unitMeasure is worth considering. It is an Android app (Android 5.0 Lollipop and up) sold through its official website, and it covers 17 categories with well over 150 conversions. It is not the right pick if you want a free app, need conversions beyond the listed categories, or expect a cloud-synced or account-based tool — the site describes a paid purchase ("Buy Now") with no free tier mentioned.
What unitMeasure actually offers
The official site positions unitMeasure around four practical traits:
- Fully offline conversion — conversions run on the device, with results updating in real time as you type. No connection is needed at any point.
- No permissions — the app requests none, so it cannot track your location, record you, or sell data to third parties. It also shows no ads.
- Small install size — slightly under 2 MB, roughly the size of a 4 MP JPEG or a one-minute MP3.
- Design options — four themes (Light, Day, Dark, Night), Material Design, and landscape mode support.
These are the claims the developer makes on its own site, so treat them as the vendor's description rather than independent test results.
Does the conversion coverage fit your use?
The app lists 17 categories. The site names these, among others:
| Category | Example units listed |
|---|---|
| Length | inches, centimeters, feet, meters, miles, kilometers, light-years |
| Volume | teaspoons, cups, gallons, milliliters, liters, cubic feet |
| Energy | joules, calories, kilowatt-hours, electron volts, BTUs |
| Time | milliseconds, seconds, hours, days, weeks, centuries |
| Digital storage | bits, bytes, kilobytes, megabytes, terabytes, megabits |
| Mass/Weight | ounces, grams, kilograms, pounds, stones, metric tons |
| Fuel efficiency | MPG, km/L, L/100 km, gallons per 100 miles (US & UK) |
| Area | square meters, square miles, hectares, acres |
| Pressure | pascals, PSI, atmospheres, bars, mmHg |
| Angle | degrees, gradians, radians, mils |
If your everyday conversions fall inside these categories, coverage is likely sufficient. If you regularly need currency rates, shoe sizes, cooking-specific conversions, or engineering units outside this list, check the full category list on the site before buying — the excerpt above is not the complete set.
Who should buy it, and who should not
Buy it if:
- You convert units in places with poor or no connectivity (travel, field work, flights).
- You care about an app that requests zero permissions and contains no ads.
- You are short on storage and want something under 2 MB.
- Your device runs Android 5.0 or later.
Skip it if:
- You want a free converter — the site shows a "Buy Now" path and no free version.
- You need conversions outside the 17 listed categories.
- You want syncing, accounts, or a web version alongside the app.
Before you purchase
- Confirm your Android version is 5.0 (Lollipop) or higher.
- Open the site's full "All The Supported Conversions" list and check that every unit you actually use appears there.
- Compare against the free converter already on your phone: if it handles your units and you don't mind ads or permissions, the paid upgrade may not be necessary.
- Note that pricing is not stated in the available site information — check the current price at the point of purchase rather than assuming a figure.
The decision comes down to one question: do offline operation, zero permissions, and a tiny footprint matter more to you than paying for an app you could otherwise get free? If yes, unitMeasure matches that need directly.