Comparison

Calculi vs Digits Basic Tape Calculator

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

Head to head
About

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.

Highlights
  • Complex expression solving
  • Unit conversion (17 categories)
  • Currency conversion (30+ currencies)
  • Scientific constants
  • Supercharged history tape
  • iMessage app integration
  • Apple Watch app
Features
Read full description

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

About

Digits Basic Tape Calculator

This app offers a calculator with spreadsheet-like editing capabilities, allowing users to easily correct and manage calculations. It features a polished interface and supports various devices. Additional features can be unlocked through in-app purchases.

Highlights
  • Editable calculation tape
  • Spreadsheet-like editing
  • Polished user interface
  • Multi-tape management (in-app purchase)
  • Sharing and printing (in-app purchase)
  • Dark Mode support
  • VoiceOver support
Features
Read full description

We're human. We're busy. We make mistakes. So we designed a calculator for humans, from the ground up. Digits combines the editability of a spreadsheet with the simplicity of a calculator. Digits is a calculator a human can love. Digits Basic is an ad-sponsored version of Digits that has basic functionality. Tap the shopping bag in Digits Basic to add powerful features such as: editing, sharing, multi-tape management, printing and more. --- Digits Basic highlights: • An updated, polished user interface with buttery-smooth interaction. • Multi-threaded processing for desktop-level performance. • Built from the ground up with support for 64-bit and the latest iOS/hardware. • Designed to maximize resolution on devices like the iPhone 11. • Split View support on iPad for side-by-side work. • Expanded in-app help. • Accessibility VoiceOver support. • Support for Dark Mode. With In-App upgrades: • Detailed color and sound customization. • Editing, flagging, commenting, sharing, printing and more. • Tape Document sharing (via Messages, Mail, Dropbox and other popular file sharing services). • Spreadsheet-like editing with calculator-level simplicity. • Fully correctable and editable line-by-line tape history. • Fluidly enter values, label and email or print. • Double-check and correct entries with ease. • Export Tape Documents in a variety of formats. Button functions: Delete row, backspace, clear all, clear, memory, memory plus, memory minus, plus or minus, tape browser, percent, export, settings, shop, tips, help, edit, insert, total, copy, use, comment, flag, sin, cos, tan, square, cube, exponent, square root, cube root, root, inverse, Euler, Pi, add, subtract, multiply, divide, total.

Screenshots

Calculi4 screens
Digits Basic Tape Calculator4 screens

Verdict

The call

The clearest difference is update cadence: Digits Basic Tape Calculator at every 2 days against Calculi's every 2 months. Digits Basic Tape Calculator also leads on iOS requirement (10.3 vs 17.6). Calculi's advantage is ratings volume (383 vs 44). On price, rating, review sentiment and ads 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. Calculi sells 4 in-app purchases, starting at $2.99 per year and Digits Basic Tape Calculator sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.4 for Calculi against 4.5 for Digits Basic Tape Calculator. That said, the two scores are not equally well evidenced: Calculi has 383 ratings behind it against 44, so its average is the more settled of the two. Written reviews are what separate them: 35% of Calculi's written reviews are positive against 40% of Digits Basic Tape Calculator's.

UpkeepUpdate frequency

Calculi ships an update every 2 months, Digits Basic Tape Calculator every 2 days. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

Scorecard3 real differences · 7 level
Calculi versus Digits Basic Tape Calculator: the parameters behind the verdict, then further details
ParameterCalculiDigits Basic Tape Calculator
PriceFreeFree
Rating4.4 (383 ratings)4.5 (44 ratings) — better
Positive reviews35.3% of reviews40.0% of reviews — better
Number of ratings383 — better44
Update frequencyEvery 2 monthsEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, Apple TV, Apple Watch — betteriPhone, iPad, iPod
Requires iOS17.610.3 — better
Further details — not scored
Size43 MB35 MB
Age rating4+4+
DeveloperMichael Natole, Jr.Shift

Customer experience

Calculi

All ratings374 ratings
Positive84.2%
Neutral5.1%
Negative10.7%
Written reviews17 reviews
Positive35.3%
Neutral5.9%
Negative58.8%

Digits Basic Tape Calculator

All ratings44 ratings
Positive88.6%
Neutral0.0%
Negative11.4%
Written reviews5 reviews
Positive40.0%
Neutral20.0%
Negative40.0%

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
Show 2 more
  • 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

Digits Basic Tape Calculator

Not enough reviews yet to summarise bugs or requests.

In-app purchases

4 purchases

Calculi

Subscriptions1
  • Calculi Pro3 Days trial$2.991 Year
One-time3
  • Small Tip$0.99
  • Medium Tip$2.99
  • Large Tip$4.99
3 purchases

Digits Basic Tape Calculator

One-time3
  • Pro Design$0.99
  • Pro Export and Sharing$0.99
  • Pro Features$1.99

Questions

Is Calculi free?
Calculi is free to download, with in-app purchases available.
Is Digits Basic Tape Calculator free?
Digits Basic Tape Calculator is free to download, with in-app purchases available.
Which has better reviews, Calculi or Digits Basic Tape Calculator?
Digits Basic Tape Calculator is rated higher. Calculi averages 4.4 out of 5 from 383 ratings, while Digits Basic Tape Calculator averages 4.5 from 44 ratings.
Do Calculi or Digits Basic Tape Calculator have ads?
Neither Calculi nor Digits Basic Tape Calculator shows ads.
Which is updated more often, Calculi or Digits Basic Tape Calculator?
Calculi ships an update every 2 months, and Digits Basic Tape Calculator every 2 days. Most recently, Calculi was updated on November 1, 2026 and Digits Basic Tape Calculator on November 2, 2026.

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