Comparison

Unit Conversion vs FlexCalc

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

Head to head
About

Unit Conversion

Easily convert between various units with this app, featuring 16 categories like temperature, currency, and distance. It also includes standard and scientific calculators, eliminating the need to switch between apps. Frequently used units are prioritized for quick access.

Highlights
  • 16 unit categories
  • Standard and scientific calculators
  • Units sorted by frequency of use
  • Programmable buttons for favorites
  • Live currency conversion rates
  • Intuitive user interface
Features
Read full description

This application offers quick and easy conversion of units. 16 different unit categories are supported, like temparature, currency, distance, weight, volume, ... In addition the app offers a calculator. You don't have to switch any more between conversion and calculation apps. There are even two calculators included, a standard and a scientific one. Units are sorted by frequency of usage, the units used most often show up on top of the list. No need to scroll anymore to find your favorite units. Programmable buttons make it possible to access your favorite conversion units even faster. All functionalities are accessible on the main screen, no need for tedious switching between sub-screens. List of supported unit categories: - currency (live update) - temperature - distance - weight - volume - time - surface - speed - angle - data storage - energy - power - pressure - concentration - radioactivity - typography Features: - simple and intuitive user interface - 2 calculators: standard and scientific - units are sorted by the frequency by which you are using them. The units you are using most are shown on top. This allows much faster working. - live update of currency conversion rates - programmable buttons: save your favorite unit conversions on these buttons for faster working. - swap key, for fast swap of the 2 selected units - all settings are saved when leaving the application Instructions: The programmable buttons are the blue buttons at the top. Hold one down until you hear the beep and the selected units will be saved on this button. Press the button again for fast recall of this unit pair. If the app emits a beep while working it means you have made an invalid operation, like for example the square root of a negative number. Please note: For currency conversion rates are downloaded from an internet server. Without a working internet connection the currency category will not show up. If you have any problems contact us at support@fappsworld.com

About

FlexCalc

This utility app allows users to create and edit calculations with linked values that update instantly. It offers a history feature to review past work and supports sharing calculations. Users can also customize themes and fonts for a personalized experience.

Highlights
  • Editable calculations
  • Linked values update automatically
  • Reuse results in new calculations
  • Calculation history
  • Share calculations
  • Customizable themes and fonts
  • Scientific functions
Features
Read full description

FlexCalc is free forever, with no ads, no tracking, and no limits. FlexCalc is a flexible calculator designed for editable calculations, linked values, history, and instant result updates. Unlike a standard calculator, FlexCalc lets you tap any number or result, edit it directly, and see related results update automatically. You can reuse results in new calculation lines, drag linked values between lines, and adjust formulas without retyping everything. Key features: - Edit any number in your calculation and instantly update the result. - Reuse results as linked values in new calculation lines. - Drag linked values to replace, insert, or adjust calculations faster. - Move the cursor inside numbers for precise edits. - Review and restore previous work with calculation history. - Share calculations as text or an image. - Customize the app with different themes and fonts. - Use scientific functions and custom constants when you need more than basic math. FlexCalc is built to stay simple, fast, and distraction-free.

Screenshots

Unit Conversion2 screens
FlexCalc4 screens

Verdict

The call

The clearest difference is price: FlexCalc at Free against Unit Conversion's $0.99. FlexCalc also leads on rating (5.0 vs 4.6) and update cadence (every 3 weeks vs every 3 months). Unit Conversion's advantage is in-app purchases (none vs 1) and ratings volume (103 vs 1). On ads and device support 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

FlexCalc is free to download; Unit Conversion costs $0.99 up front. FlexCalc sells 1 one-off in-app purchase. Unit Conversion asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

FlexCalc holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Unit Conversion has 103 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Unit Conversion ships an update every 3 months, FlexCalc every 3 weeks. The most recent releases landed on November 6, 2026 and November 5, 2026 respectively.

Scorecard7 real differences · 3 level
Unit Conversion versus FlexCalc: the parameters behind the verdict, then further details
ParameterUnit ConversionFlexCalc
Price$0.99Free — better
Rating4.6 (103 ratings)5.0 (1 ratings) — better
Positive reviews73.6% of reviews—
Number of ratings103 — better1
Update frequencyEvery 3 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPodiPhone, iPod
Requires iOS6.0 — better13.0
Further details — not scored
Size3 MB21 MB
Age rating4+4+
DeveloperFapps World et Cie S.E.C.S.Tho Tran

In-app purchases

None

Unit Conversion

No in-app purchases

1 purchases

FlexCalc

One-time1
  • Buy a Coffee$1.99

Questions

Is Unit Conversion free?
Unit Conversion costs $0.99, with no in-app purchases.
Is FlexCalc free?
FlexCalc is free to download, with in-app purchases available.
Which has better reviews, Unit Conversion or FlexCalc?
FlexCalc is rated higher. Unit Conversion averages 4.6 out of 5 from 103 ratings, while FlexCalc averages 5.0 from 1 ratings.
Do Unit Conversion or FlexCalc have ads?
Neither Unit Conversion nor FlexCalc shows ads.
Which is updated more often, Unit Conversion or FlexCalc?
Unit Conversion ships an update every 3 months, and FlexCalc every 3 weeks. Most recently, Unit Conversion was updated on November 6, 2026 and FlexCalc on November 5, 2026.

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