Calculi: Scientific Calculator

Calculi: Scientific Calculator

Unit & Currency Conversion

374 ratings
17 reviews
Free
In-App Purchases

Details

  • Released
  • Updated

Features

Calculi: Scientific Calculator screenshot #1 for iPhone
Calculi: Scientific Calculator screenshot #2 for iPhone
Calculi: Scientific Calculator screenshot #3 for iPhone
Calculi: Scientific Calculator screenshot #4 for iPhone
Calculi: Scientific Calculator screenshot #5 for iPhone
Calculi: Scientific Calculator screenshot #6 for iPhone
Calculi: Scientific Calculator screenshot #7 for iPhone
Calculi: Scientific Calculator screenshot #8 for iPhone
Calculi: Scientific Calculator screenshot #9 for iPhone
iphone
ipad
watch
appletv
🖼️Get Icon
Icons↘︎

About

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
Show original description

What's New in Calculi

4.4.1

March 4, 2025

This update includes a customer center to manage your Calculi Pro subscription.

Subscription plans

Calculi Pro

Calculi Pro

$2.991 Year
3 Days trial
How to cancel Calculi subscription ⁉️
4

In-App Purchases

$0.99

Small Tip

Small Tip

User reviews

WAY better than the stock iPhone calculator!

This calculator app blows the built in iPhone one OUT OF THE WATER!!! (iPhone 11). For me at least it’s better in many ways, one of the most important of which is the history screen including the functions of bringing past answers & expressions into your current operation. Also, despite it’s age the author regularly drops helpful updates. This is coming from someone who generally, highly prefers native apps over 3rd party ones.
Show more

Pop up’s

I really don’t need a pop up rating request every time I open the app

Updated to add ads?

You updated the app to have ads? That’s so disappointing!

I also don’t like the added clutter of keys I will never use in the iPad app which forces the number keys to be centered instead of on the left as one would expect. I would have to limit my use to slide over in landscape orientation to keep the normal calculator feel.
Show more

Awesome app!

Using it all the time, very helpful calculator.

Almost Perfect

This is dang near perfect: works with a keyboard! Works in Split Screen! No ads! Data not linked to your identity! History tape, keyboard shortcuts, shareable history… seriously, almost everything I want. There’s just one thing that makes it impossible for me to use: It doesn’t work in Slide Over. You can use the calculator itself in Slide Over, or you can view and share the history, but you can’t do both. Once you view the history, there’s no way to get back to the calculator in Slide Over, you must change to Split Screen, or close and re-open the app, that kind of thing. If this app ever gets Slide Over fixed, I will certainly download it again and definitely update my review. Until then, might as well delete it and keep using the calculator on my iPhone while working on the iPad. For what I’m looking for, this app is unusable.

UPDATE: This app is working perfectly now! I love it! The developer fixed it in the latest update, and I can confirm that now it works in Slide Over. It went from being unusable to being exactly what I want. Seriously, if I had the talent to be able to develop apps, this is what I would make—it checks all the boxes for me. I don’t need scientific functions or anything fancy, but I do need a history tape. I really like the tape in this app, because each equation has it’s own “bubble” in the history tape window, which makes recognizing each one simple. I kind of can’t wait for my friends to ask me if I use a calculator app on my iPad, so I can recommend Calculi to them and tell them about all the reasons they’re going to love it, too.
Show more

Developer apps

FAQ

What does Calculi do?

Calculi is a smart calculator that simplifies complex calculations. It offers advanced scientific functions, allows for solving complex expressions using the order of operations, and provides a multi-line display for large inputs. It also includes features like unit and currency conversion, constants, and a history tape.

What are the key features of Calculi?

Key features include the ability to solve complex expressions, unit conversion across 17 categories, currency conversion for over 30 currencies, access to scientific constants, a supercharged history tape with bookmarking and notes, and integration with iMessage and Apple Watch. It also supports gestures and external keyboards.

How much does Calculi cost?

The base Calculi app is free to download and use for its core calculator functions. However, advanced features like unit conversion and currency conversion require a Calculi Pro subscription. Specific pricing details for the subscription can be found within the app.

What devices is Calculi compatible with?

Calculi is designed with iOS and iPadOS in mind and adapts to all the latest devices. It offers multitasking and multi-window support on iPad, interactive home screen widgets, and Control Center widgets for quick access. It is also available as an app for Apple Watch.

What are common use cases for Calculi?

Common use cases include balancing checkbooks, solving problems in advanced math classes, converting units for measurements (like length or area), converting currencies while traveling, and using scientific constants in calculations. Its history tape also allows for easy review and sharing of past calculations.