Comparison

Units vs Concrete Foundation Calculator

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

Concrete Foundation Calculator

Features
Read full description

The Concrete Foundation Calculator is a powerful and user-friendly tool designed to help builders, contractors, engineers, and DIY enthusiasts accurately estimate the amount of concrete needed for various foundation projects. Whether you're working on a slab, footing, column, or wall, this calculator simplifies the process by providing precise volume calculations based on your input dimensions.

Screenshots

Units4 screens
Concrete Foundation Calculator4 screens

Verdict

The call

The clearest difference is price: Units at Free against Concrete Foundation Calculator's $6.99. Concrete Foundation Calculator's advantage is in-app purchases (none vs 3) and ads (none vs shown). On device support and iOS requirement 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

Units is free to download; Concrete Foundation Calculator costs $6.99 up front. Units sells 3 one-off in-app purchases. Concrete Foundation Calculator asks for nothing beyond the download.

UpkeepUpdate frequency

Units ships an update monthly, Concrete Foundation Calculator daily. The most recent releases landed on November 6, 2026 and October 30, 2026 respectively.

Scorecard4 real differences · 6 level
Units versus Concrete Foundation Calculator: the parameters behind the verdict, then further details
ParameterUnitsConcrete Foundation Calculator
PriceFree — better$6.99
Rating4.1 (51 ratings) — better—
Positive reviews60.1% of reviews—
Number of ratings51 — better—
Update frequencyMonthlyDaily — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.017.0
Further details — not scored
Size86 MB35 MB
Age rating4+4+
DeveloperHomegrown Software LtdFengbang Yang

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

Concrete Foundation Calculator

Not enough reviews yet to summarise bugs or requests.

In-app purchases

3 purchases

Units

One-time3
  • Small Tip$0.99
  • Medium Tip$2.99
  • Large Tip$4.99
None

Concrete Foundation Calculator

No in-app purchases

Questions

Is Units free?
Units is free to download, with in-app purchases available.
Is Concrete Foundation Calculator free?
Concrete Foundation Calculator costs $6.99, with no in-app purchases.
Do Units or Concrete Foundation Calculator have ads?
Units shows ads; Concrete Foundation Calculator does not.
Which is updated more often, Units or Concrete Foundation Calculator?
Units ships an update monthly, and Concrete Foundation Calculator daily. Most recently, Units was updated on November 6, 2026 and Concrete Foundation Calculator on October 30, 2026.

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