Comparison

calculator DUO vs JustCalc

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

Head to head
About

calculator DUO

This utility app allows for comfortable one-handed calculations by letting you reposition the keypad. It also provides features to save and reuse past answers, correct input with a swipe, and handle both everyday and scientific calculations, including date and time functions.

Highlights
  • One-handed keypad repositioning
  • Save and reuse past answers
  • Swipe to delete/correct input
  • Everyday and scientific functions
  • Date and time calculations
  • Customizable themes and display
Features
Read full description

Calculate comfortably with one hand. Put past answers to work. Move the keypad within thumb reach, reuse saved results with a tap, and swipe to correct your input. Handle everyday math, scientific functions, dates and time in one place. WITHIN THUMB REACH Move and resize the left- or right-hand keypad to suit your grip. KEEP THE ANSWERS YOU NEED Save useful results on a visual shelf. Tap to reuse them, recall your last answer, or search your calculation history and mark favorites. CORRECT INPUT WITH CONFIDENCE Swipe to delete a digit or function. The deleted content stays visible until your next input; tap the return button to undo the deletion. FROM EVERYDAY TO SCIENTIFIC Use arithmetic, percentages, powers, roots, logarithms and trigonometric functions. Long-press a result for a large display, with adjustable text, color, font and size. MAKE IT YOURS Five themes, optional digit grouping and an interface in 50 languages. No account is required. Expressions, saved results and calculation history are stored on your device. DATES AND TIME, TOO Find the time between two dates, add or subtract days and hours, and calculate across time zones. The free app may show banner ads. Remove Ads is an optional one-time purchase, with purchase restoration through the same Apple Account.

About

JustCalc

Read full description

One app. Infinite calculations. Zero clutter. JustCalc redefines what a mobile calculator can be. By merging advanced computational power with a premium glassmorphic design, it delivers an elegant, all-in-one solution for students, professionals, and everyday users. Whether you are balancing finances, solving complex physics formulas, or converting global time zones, JustCalc adapts to your workflow and looks incredible doing it. ------------------------------- CORE FEATURES: • The Ultimate Engine: Basic, Scientific, Graphing, Chemistry, and Physics calculators built-in. • Everyday Utilities: Seamless conversions for Units, Currencies, Time Zones, and Health/BMI tracking. • Glassmorphic UI: A visually stunning experience featuring frosted glass, glowing accents, and fluid animations. • Total Customization: Drag and drop your most-used tools to the top of your grid, and long-press to personalize individual accent colors. • True Dark Mode: Fully optimized for late-night crunching to reduce eye strain. ------------------------------- Work smarter, calculate faster, and clear the clutter. Download JustCalc today.

Screenshots

calculator DUO4 screens

Verdict

The call

The clearest difference is in-app purchases: JustCalc at none against calculator DUO's 1. JustCalc also leads on iOS requirement (13.0 vs 16.5). calculator DUO's advantage is device support. On price 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. calculator DUO sells 1 one-off in-app purchase. JustCalc asks for nothing beyond the download.

Scorecard3 real differences · 7 level
calculator DUO versus JustCalc: the parameters behind the verdict, then further details
Parametercalculator DUOJustCalc
PriceFreeFree
Rating5.0 (3 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings3 — better—
Update frequencyEvery 10 days—
AdsYes—
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad — better—
Requires iOS16.513.0 — better
Further details — not scored
Size18 MB24 MB
Age rating4+4+
DeveloperWenbin leiHean Zhen Gooi

In-app purchases

1 purchases

calculator DUO

One-time1
  • Remove Ads$1.99
None

JustCalc

No in-app purchases

Questions

Is calculator DUO free?
calculator DUO is free to download, with in-app purchases available.
Is JustCalc free?
JustCalc is free to download, with no in-app purchases.

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