# Calcularium — Reactive Advanced Calculator

> Reactive advanced calculator with real-time results, unit conversion, and scripting. (iPhone/iPad app by InVooDoo LLC.)

- Source: https://appshunter.io/ios/app/calcularium/id824113384 (this page in markdown: same URL + `.md`)
- Developer: [InVooDoo LLC](https://appshunter.io/developer/1173246186)
- Category: Productivity, Utilities
- Price: Free with in-app purchases
- Rating: 4.60/5 from 2,173 App Store ratings · 49 written reviews indexed
- Age rating: 4+
- Requires: iOS 18.0 · 52 MB
- Languages: American English
- Released: 2014-02-26
- Data updated: 2026-08-29
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/calcularium/id824113384/reviews.md

## What is Calcularium?

Here are Calcularium users describing the app:

"You know how you're slowly calculating something and you're in the middle of an expression so you want to know how you're doing? Yeah well that's real time calculation and I couldn't find an app that did it right, tried dozens of them and still nothing, BUT this app does it the perfect way, actually the way it should work, this app is definitely worth it, thanks a lot devs, big love.

Edit: OMG this is better than I thought, I just noticed the tutorials given and this app has more functions than I noticed, this is super amazing, devs, you're the best." – Anton31kah10

"I mean it literally. The tiny app packs impressive amount of useful stuff for a mere calculator. I would say it’s like mobile Excel. Math functions, unit conversion, currency exchange rates, and, even simple programmers functions. I wrote a small formula to calculate tips for our county. Easier and better than any tipping app!

I hope the developer expands these functions for Shortcuts and Siri. This would be real killer app! Thanks guys!" – Z!KeepeR

"What looks like just a clean calculator app is in fact a powerhouse full of advanced features you could only get with custom Excel mega sheet." – AlexDbk

"You can find a lot of different kind of calculators but this is something completely new and awesome. It is not an another boring calculator. This is your real helper if you need to calculate something more than 2+2 :). Tutorial is great and helpful. History, customizable functions, variables, converter and much more. Great! It is definitely the next generation of the regular things." – Lysyk

CALCULARIUM FEATURES:
• Voice-controlled, backed by Siri
• Script and Photo input modes
• Reactive Calculations
• Multi-Level Sub-Calculations with No Limits
• History: Editable and Reusable
• Self-Explanatory Naming for Every Component
• Functions and Reusable Expressions
• Constants and Reusable Numbers
• Multiple Reversible Conversions (350+ units and 160+ currencies)
• Advanced Search
• Built-In Scientific Functions

CONTROL BY VOICE
Calcularium is also can be controlled by voice and has the ability to understand spoken math questions and calculate the answer. Tell it: "6 bottles by 15 dollars” - and it will give you the right result! It works by using verbal numbers and mathematical operations. 

FLUID DESIGN
The design language of the Calcularium is based on tokens. All tokens are of the same structure: the left part shows a type of the element, the right part has a result or an entered value and its name on top. In addition to tokens there are pure numbers and math operators.

HISTORY 
You can set an expression as a variable with the goal to use it afterwards in other expressions and give every component a clear name to recall what it stands for easily. Create a calculation, and next time you reuse it from History section, every component will clearly speak to you. 


Almighty Version is a recurrent subscription with such options: 1 month, 6 month and 1 year. Confirmation of purchase is required to start free one week trial period. The subscription begins immediately. Payment will be charged to iTunes Account at the end of the trial period.

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.

Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user’s Account Settings after purchase. Any unused portion of a free trial period will be forfeited when the user purchases a subscription.

Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable

Privacy Policy
https://www.invoodoo.com/privacy-policy

Terms of Use
https://www.invoodoo.com/terms-of-use

## Key features

- Reactive Calculations
- Voice Control (Siri)
- Script and Photo Input
- Multi-Level Sub-Calculations
- Editable History
- Unit and Currency Conversion
- Customizable Functions

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Almighty Version | $29.99 | per year |
| Almighty Version | $4.99 | per 6 months |
| Almighty Version | $3.99 | per month |
| InVooDoo One | $5.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Unlock Pro Version | $199.99 | one-time |
| Lifetime Almighty Version | $199.99 | one-time |
| Remove Ads Only | $199.99 | one-time |


## What do users think of Calcularium?

Overall sentiment: positive

**Pros**

- 🚀 Powerful and feature-packed
- 👍 Easy to use with great tutorials
- 🎨 Beautiful and customizable design
- 💡 Innovative features like real-time calculation
- 🙌 Excellent value for money

**Cons**

- 🔍 Confusing or unintuitive interface
- 📢 Excessive advertisements
- 🐛 Calculation errors or inconsistencies
- 🔒 Limited functionality in free version

**Commonly reported bugs**

- Crashes or freezes on certain devices
- Incompatibility with older iOS versions
- Issues with calculator widget functionality

**Most requested features**

- Add basic calculator functions like equal and clear buttons
- Improve unit conversion and scientific functions
- Integrate with Shortcuts and Siri
- Provide more customization options

## Recent user reviews (10 of 49)

All indexed reviews: https://appshunter.io/ios/app/calcularium/id824113384/reviews.md

### 5/5 — Awesome app

*2026-06-27, version 3.6.34*

Such a great way to keep a roster of my returns. Thanks 🙏

### 5/5 — Best calculator I have run into.

*2024-07-08*

Not only only this app a power house with functions, expressions, in addition to simple calculations, it is also easy to use. Comes with a large collection of tutorials to help users get the most out of the many features this app provides. I love that I paid for the Almighty version awhile back and they haven’t tried to squeeze more money from me. There is definitely honor in this company. They do offer subscriptions that provide many apps, I may consider trying them as the need arises.
Thanks for the wonderful product and good business practice.

**Developer response:** Thank you for your kind words about Calcularuim! We're delighted to hear you're enjoying the app's powerful features and ease of use.

We appreciate your recognition of our fair pricing and business practices. Our goal is to provide value without hidden costs, and we're glad that's been your experience.

If you ever explore our subscription options, we're confident you'll find even more tools to enhance your productivity. Thanks for being a valued user!

### 3/5 — Too many ads

*2024-03-29, version 3.2.31*

Too many ads

### 5/5 — A calculator that doesn’t quite do calculations correctly

*2023-10-29*

Calculator doesn’t work well with adding subtracting of the same calculation. Have to add numbers only or subtract them only. Heaven forbid you want to divide! Horrible

### 5/5 — The most challenging yet useful calculator I’ve ever owned

*2023-08-30*

It makes my math so much simpler.

**Developer response:** Thank you so much! We glad you like it.

### 3/5 — Difficult

*2023-08-15*

I see an ad, but on my iPhone X, I cannot tap circled X in corner to get “granted.” I end up seeing more ads, ad infinitum.

### 1/5 — It’s not working

*2023-06-20, version 3.2.28*

I installed it and couldn’t use it. I press number and it gives me another

### 1/5 — No cash counter Tally

*2023-02-09, version 3.5.24*

❌🙅 99$ x❌

Thanks for reminding me to delete app.. 
I’ll be enjoying my 99$ buying multiple of apps.

Lmaoo

### 5/5 — Daquawn Williams

*2022-08-23*

I love it 
I wish they had this back in the days

### 1/5 — Incorrect calculations

*2022-07-12, version 3.6.18*

It will round calculations instead of giving you the whole answer. Half of 0.005 should be 0.0025 not 0.003.

## Frequently asked questions about Calcularium

### What does Calcularium do?

Calcularium is an advanced calculator app that provides real-time calculations, meaning you see results as you input your expression. It offers a wide range of features beyond basic arithmetic, including unit and currency conversions, customizable functions, and the ability to control it via voice commands.

### What are the key features of Calcularium?

Key features include reactive calculations, voice control powered by Siri, script and photo input modes, multi-level sub-calculations, an editable and reusable history, customizable functions, constants, and over 350 unit and 160 currency conversions.

### How much does Calcularium cost?

The app is free to download and use, with an optional 'Almighty Version' available as a recurrent subscription for additional features. The description mentions this subscription is available on a monthly basis.

### What devices is Calcularium compatible with?

While specific device compatibility isn't detailed, the app is described as a mobile application and mentions Siri integration, suggesting compatibility with iOS devices that support Siri. Users can input calculations via voice, script, or photo.

### What are some common use cases for Calcularium?

Common use cases include calculating tips, performing complex mathematical expressions in real-time, converting units for measurements or currencies for travel and finance, and creating reusable formulas for recurring calculations. It can also be used for programmer functions.

## Version history (last 5 releases)

### 3.6.34 — 2025-12-29

• bugfixes and improvements

### 3.6.33 — 2024-10-01

We made updates to make it easier to discover our apps with the InVooDoo One package.

### 3.2.31 — 2023-10-24

We're constantly updating the app to make it better for you.

### 3.2.30 — 2023-09-01

• InVooDoo One improvements

### 3.2.29 — 2023-08-28

• bug fixes and stability improvements

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-29.*