Calculi vs Modulo Calculator, iCalcModulo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calculi
A smart and powerful calculator designed for ease of use, offering advanced scientific functions, unit and currency conversion, and a supercharged history tape. It adapts to various devices and supports external keyboards for enhanced functionality.
- Complex expression solving
- Unit conversion (17 categories)
- Currency conversion (30+ currencies)
- Scientific constants
- Supercharged history tape
- iMessage app integration
- Apple Watch app
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Calculators can be hard to use. Calculi plans to change all that. SIMPLE BUT POWERFUL Calculi is a smart calculator that is simple and easy to use, but with advanced features for power users. Whether you are trying to balance your checkbook or taking an advanced math class, this app will help you with all of your calculating needs. CALCULATE ANYTHING Calculi doesn’t just add two numbers together but can solve complex expressions using the order of operations. The multi-line display allows for small or large expressions. So go ahead and calculate anything and everything! Press the 2nd button to reveal more scientific functions. UNIT CONVERSION You can easily convert any of your calculations to a different unit across 17 categories such as length, area, and volume. Unit conversions are saved to your calculation history for easy review. A Calculi Pro subscription is required for this feature. CURRENCY CONVERSION Traveling abroad? Not sure how much your lunch costs? Calculi has you covered with support for over 30 different currencies around the globe (data is updated daily from the European Central Bank). A Calculi Pro subscription is required for this feature. CONSTANTS Common constants from both mathematical and scientific fields (astronomical, chemical, electromagnetic, etc.) are included for use in calculations. DESIGNED WITH iOS 18 AND iPadOS 18 IN MIND Calculi adapts to all the latest iOS and iPadOS devices. Even better, multitasking and multi-window support is available in all orientations on the iPad. Interactive widgets are included for calculations on your home screen, and Control Center widgets provide quick access. You can have Calculi wherever you need it. GESTURES Gestures are fun. So why not? - Long press the delete button to clear the display - Long press the equals button to use the previous result or expression - Long press the display to copy, paste, or share - Long press any calculation item to reuse the expression or result SUPERCHARGED HISTORY TAPE Calculations from the history tape can be bookmarked for later and notes can be added for additional context. You can search across notes, expressions, and answers to find the calculation that you are looking for. GET SHARING Don’t be selfish. This history tape can be shared either as a single thread or the entire tape using numerous methods such as email, messaging, or print. There is also an iMessage app so you can easily send calculations. CALCULATE ON YOUR WRIST Calculi is also available on Apple Watch! Besides a four-function calculator, you will also find a tip calculator and counter. EXTERNAL KEYBOARD AND TRACKPAD SUPPORT Pair an external keyboard or trackpad to gain access to powerful shortcuts and full cursor support. You can hold down the command key on your keyboard to view all the available shortcuts. Finally, if you enjoyed Calculi, please take some time to leave a review. Feedback is always appreciated for future updates. CALCULI PRO This yearly subscription grants you access to the following: - Unit Conversions - Currency Conversions - App Themes - Colorful custom icons TIP JAR If you enjoy using the app and want to support an independent app developer, please consider sending a tip. Subscription Details – Payment will be charged to iTunes Account at confirmation of purchase – Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period – Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal – Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user’s Account Settings after purchase Terms of Use: https://www.calculiapp.com/terms.html Privacy Policy: https://www.calculiapp.com/privacy-policy.html
Modulo Calculator, iCalcModulo
This utility app functions as a standard calculator with a unique remainder calculation feature for division. It offers a familiar interface, calculation history, and clipboard support. Ideal for tasks requiring division with remainders and general arithmetic.
- Division with remainder calculation
- Familiar calculator operation system
- Calculation history display
- Calculation formula display
- Clipboard copy and paste
- Percent calculations
- Independent memory
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iCalcModulo is a simple and easy-to-use calculator with a familiar operation system, plus a remainder calculation function (division with a "remainder"). It can be calculated by the same operation as real calculators. (Compliant with calculator of company C) It also has functions unique to the calculator app, such as displaying calculation history and calculation formulas. There is ⓘ button to display the information page that describes instructions. Thank you for using iCalc. (Instructions) The operation for Arithmetic Calculations, Root Calculations, Constant Calculation and Independent Memory Calculation are the same as real general calculators. (Compliant with calculator of company C) The original operations and functions are as follows. - When performing division by pressing [MOD] instead of [÷] to calculate, the quotient and remainder will be displayed. The remainder is calculated so that it is greater than or equal to 0. - For example, when calculating the quotient and remainder of 30 ÷ 7, if you operate [3] [0] [MOD] [7] [=], the calculation result '4-2', which means the quotient is 4 and the remainder is 2, is displayed on the result display. - For example in a dispensing work, a calculation when counting 3 tablets a day and 90 days with 14 tablets per sheet is [3] [×] [9] [0] [MOD] [1] [4] [=], the result '19-4', which means 19 sheets and 4 tablets, is displayed. - If the result of calculation with the [MOD] key is used for the next calculation, the value of the quotient will be used. - After calculation with the [=] key, the result is displayed on the main display and a white frame is added. - If you tap an operator key instead of [=] key to calculate, the operator turns white, indicating that you are preparing for the next calculation. - The calculation formula is displayed below the main display. - Flipping the main display while inputting, the minimum digit of the displayed input value will be erased one by one. - Flipping the MR display for independent memory to erase the value in independent memory. - Call the calculation history with [< Prev] key. Repeat tapping to call older history. If you called a calculation history that was too old, you can use [Next >] key to return to newer history. - Tapping [C] key to erase the entered value. And [C] key changes to [AC] key. - Tapping [MR] key to enter the value of the independent memory. And [MR] key changes to [MC] key. - [Copy] and [Paste] keys for clipboard. - Percent Calculations What is 25% of 100? [1] [00] [×] [2] [5] [%] → 50 25% of what number is 100? [1] [00] [÷] [2] [5] [%] → 400 What is 100 increased by 25%? [1] [00] [+] [2] [5] [%] → 125 What is 100 decreased by 25%? [1] [00] [−] [2] [5] [%] → 75 (Others) - The calculation range is −999,999,999,999 ~ 999,999,999,999. - The maximum number of digits is 12. - The developer assumes no responsibility for any loss or claims by third parties which may arise from the use of this app.
Screenshots
Verdict
The clearest difference is rating: Modulo Calculator, iCalcModulo at 5.0 against Calculi's 4.4. Modulo Calculator, iCalcModulo also leads on in-app purchases (none vs 4) and review sentiment (50% vs 35%). Calculi's advantage is ads (none vs shown) and ratings volume (383 vs 1). On price, update cadence 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
Both are free to download. Calculi sells 4 in-app purchases, starting at $2.99 per year. Modulo Calculator, iCalcModulo asks for nothing beyond the download.
Modulo Calculator, iCalcModulo holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Calculi has 383 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 35% of Calculi's written reviews are positive against 50% of Modulo Calculator, iCalcModulo's.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 22, 2026 and October 30, 2026 respectively.
| Parameter | Calculi | Modulo Calculator, iCalcModulo |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (383 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 35.3% of reviews | 50.0% of reviews — better |
| Number of ratings | 383 — better | 1 |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Ad-supported — better |
| Devices | iPhone, iPad, Apple TV, Apple Watch — better | iPhone, iPad, iPod |
| Requires iOS | 17.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 43 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | Michael Natole, Jr. | Takao Ichimura |
Customer experience
Calculi
Modulo Calculator, iCalcModulo
Bugs and requests
Calculi
Reported bugs
7 issues- Calculation not appearing in history until app restart
- New calculation replaces previous in history tile
- Crashes when multiplying by 1.03
- Physical iPad keyboard not recognized
- App crashes/closes on iPad iOS 13
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- App launches then closes immediately on iOS 13
- Cannot calculate simple equations like 9x9
Requested features
3 requests- Option for Dark Mode all the time
- Option to choose icons
- Fix Slide Over functionality
Modulo Calculator, iCalcModulo
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Calculi
- Calculi Pro3 Days trial$2.991 Year
- Small Tip$0.99
- Medium Tip$2.99
- Large Tip$4.99
Modulo Calculator, iCalcModulo
No in-app purchases
Questions
Is Calculi free?
Is Modulo Calculator, iCalcModulo free?
Which has better reviews, Calculi or Modulo Calculator, iCalcModulo?
Do Calculi or Modulo Calculator, iCalcModulo have ads?
Which is updated more often, Calculi or Modulo Calculator, iCalcModulo?
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