Janus Calculator vs Mr.CalCul
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Janus Calculator
This app offers a unique dual-calculator interface, supporting both standard and Reverse Polish Notation. It features programmable functions, extensive scientific and financial tools, and includes physical constants and an advanced option calculator.
- Dual calculator interface (Standard and RPN)
- Programmable functions
- Finance and scientific functions
- Physical constants
- Black-Scholes option calculator
- Implied value calculation
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Two-sided calculator. Side A uses Standard Notation, Side B uses Reverse Polish Notation. Both calculators are programmable, include various finance and scientific functions, and the values of 45 physical constants. Also includes a Black-Scholes option calculator, including calculation of implied values for each of the inputs.
Mr.CalCul
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Generally, if you want to use a calculator app, you have to open it. Not anymore now! Now, you can simply slide downward and Mr.CalCul will solve your problem! Of course, you can use it in the original way as well. Another feature is that Mr.CalCul can memorize your counting steps. Every time you use it, it will start from last number you've got.
Screenshots
Verdict
The clearest difference is update cadence: Mr.CalCul at every 3 months against Janus Calculator's every 45 months. Mr.CalCul also leads on iOS requirement (10.0 vs 26.2). On price, ads, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Janus Calculator ships an update every 45 months, Mr.CalCul every 3 months. The most recent releases landed on October 21, 2026 and October 12, 2026 respectively.
| Parameter | Janus Calculator | Mr.CalCul |
|---|---|---|
| Price | Free | Free |
| Rating | 2.0 (1 ratings) — better | — |
| Positive reviews | 83.3% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 45 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 26.2 | 10.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 27 MB |
| Age rating | 4+ | 4+ |
| Developer | Geoffrey Domm | WonderfulCode |
In-app purchases
Janus Calculator
No in-app purchases
Mr.CalCul
No in-app purchases
Questions
Is Janus Calculator free?
Is Mr.CalCul free?
Do Janus Calculator or Mr.CalCul have ads?
Which is updated more often, Janus Calculator or Mr.CalCul?
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