Comparison

Calculus doodlus vs Kalculator

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

Head to head
About

Calculus doodlus

This app offers a multi-page calculator with automatic saving and advanced functions like percentage and VAT calculation. It uniquely presents calculations in an interactive, handwritten style that can be customized with your own script.

Highlights
  • Multi-page interface
  • Automatic work saving
  • Percentage calculation
  • VAT calculation
  • Customizable handwriting style
  • Interactive calculation pages
Features
Read full description

Calculus doodlus keeps your calculations visible, line by line. Read them back, continue where you left off, or go back and change any number. • Edit, copy & link Touch and hold any number to edit it. Tap a line to reuse its value, or double-tap to link it to another calculation and keep the values in sync. • Percentages & VAT Calculate percentages or deduct VAT with ease. The calculation remains visible, so you can see exactly how the result was obtained. • Keep your calculations Your pages are saved automatically. Keep recent calculations, pin important ones, rename and share them, and switch between pages with a swipe. • Big numbers, exact results Every operation is performed digit by digit, the same way you learned in school. That's how Calculus doodlus handles very large numbers while keeping exact results on the page. • Make it your own Customize the keyboard color and replace its digits with your own handwriting. Add Calculus doodlus to your Lock Screen or Control Center for one-tap access. 4.8 stars from more than 10,000 ratings Every 2 seconds, someone somewhere in the world starts a new calculation page. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Kalculator

This app allows you to type mathematical expressions naturally, like you would write them, and see the results in real-time. It saves all your calculations, offers exact decimal answers, and provides numerous customization themes. Widgets keep your latest result accessible on your home screen.

Highlights
  • Type expressions naturally
  • See answers as you go
  • Exact decimal arithmetic
  • Saved and synced calculation history
  • Customizable themes and app icons
  • Home screen widgets
  • Accessibility features
Features
Read full description

Kalculator is the calculator for the math you actually do. Type (80×200)÷29+56 the way you'd write it, see the answer as you go, and keep every result. TYPE IT LIKE YOU WRITE IT Enter whole expressions with brackets. Tap to place the cursor, double-tap to select a number, and fix a mistake without starting over. EXACT ANSWERS Kalculator uses exact decimal arithmetic, so 0.1 + 0.2 is 0.3, and long numbers stay exact from one calculation to the next. YOUR HISTORY, EVERYWHERE Every calculation is saved and synced with iCloud across your iPhone and iPad. Swipe down to see it, tap a row to use its result, or edit, copy, share or delete it. Export your whole history as text. 49 THEMES, ALL INCLUDED From Gold to Retro to Citrus Punch, with app icons to match. Every theme is free. WIDGETS Keep your latest result on the Home Screen, or start a calculation in a widget and continue it in the app. MADE FOR EVERYONE Clear contrast in every theme, with support for VoiceOver, larger text and Reduce Motion. On iPad, history stays in a sidebar and a hardware keyboard works for typing and editing.

Screenshots

Calculus doodlus4 screens
Kalculator4 screens

Verdict

The call

The clearest difference is review sentiment: Calculus doodlus at 82% against Kalculator's 38%. Calculus doodlus also leads on rating (4.8 vs 4.2) and ratings volume (584 vs 19). Kalculator's advantage is ads (none vs shown) and monetization model (free vs free with in-app purchases). On price, update cadence, in-app purchases 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

Both are free to download. Calculus doodlus sells 1 in-app purchase, starting at $4.99 per year and Kalculator sells 7 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Calculus doodlus holds the better App Store score, 4.8 against 4.2. That said, the two scores are not equally well evidenced: Calculus doodlus has 584 ratings behind it against 19, so its average is the more settled of the two. Written reviews point the same way: 82% of Calculus doodlus's written reviews are positive against 38% of Kalculator's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 6 weeks. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

Scorecard5 real differences · 5 level
Calculus doodlus versus Kalculator: the parameters behind the verdict, then further details
ParameterCalculus doodlusKalculator
PriceFreeFree
Rating4.8 (584 ratings) — better4.2 (19 ratings)
Positive reviews81.9% of reviews — better38.5% of reviews
Number of ratings584 — better19
Update frequencyEvery 6 weeksEvery 6 weeks
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPadiPhone, iPad, Apple TV — better
Requires iOS17.0 — better18.6
Further details — not scored
Size13 MB2 MB
Age rating4+4+
DeveloperStéphan BarbéKoombea, Inc.

Customer experience

Calculus doodlus

All ratings580 ratings
Positive94.1%
Neutral2.2%
Negative3.6%
Written reviews503 reviews
Positive81.9%
Neutral6.2%
Negative11.9%

Kalculator

All ratings19 ratings
Positive73.7%
Neutral5.3%
Negative21.1%
Written reviews13 reviews
Positive38.5%
Neutral7.7%
Negative53.8%

Bugs and requests

Calculus doodlus

Reported bugs

3 issues
  • Calculation results not displaying correctly
  • App crashing on launch for some users
  • Handwritten numbers not registering properly

Requested features

5 requests
  • Add ability to edit/delete individual calculations
  • Implement a dark mode option
  • Include more advanced math functions
  • Allow copying/pasting of individual numbers
  • Improve multitasking support

Kalculator

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Calculus doodlus

Subscriptions1
  • Remove Ads$4.991 Year
7 purchases

Kalculator

One-time7
  • Old School Theme Pack$0.99
  • Dark Theme Pack$0.99
  • Pastel Theme Pack$0.99
Show 4 more
  • Vibrant Theme Pack$0.99
  • Classic Theme Pack$0.99
  • Light Theme Pack$0.99
  • Seasons Theme Pack$0.99

Questions

Is Calculus doodlus free?
Calculus doodlus is free to download, with in-app purchases available.
Is Kalculator free?
Kalculator is free to download, with in-app purchases available.
Which has better reviews, Calculus doodlus or Kalculator?
Calculus doodlus is rated higher. Calculus doodlus averages 4.8 out of 5 from 584 ratings, while Kalculator averages 4.2 from 19 ratings.
Do Calculus doodlus or Kalculator have ads?
Calculus doodlus shows ads; Kalculator does not.
Which is updated more often, Calculus doodlus or Kalculator?
Calculus doodlus ships an update every 6 weeks, and Kalculator every 6 weeks. Most recently, Calculus doodlus was updated on November 1, 2026 and Kalculator on November 6, 2026.

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