Janus Calculator vs Calc
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
Read full descriptionHide full description
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.
Calc
This app offers a high-precision scientific calculator with over 50 digits of accuracy. It supports advanced mathematical functions, complex arithmetic, and programmable features for derivatives, integrals, and root finding.
- High-precision calculations (50+ digits)
- Extensive mathematical functions
- Programmable features
- Complex arithmetic
- Graphing capabilities
- Derivative and integral calculation
Read full descriptionHide full description
Calc-50 is a high-precision scientific graphing RPN calculator. It carries over 50 digits of accuracy and has a large number of mathematical functions, including trig and hyperbolic functions and their inverses, and math special functions such as gamma, beta, psi, exponential integral, sine, cosine, and log integrals, Bessel functions, and more. It is programmable, with functions that take user functions and find derivatives, integrals, function max/min, and roots. Calc-50 also provides complex arithmetic and elementary functions.
Screenshots
Verdict
The clearest difference is rating: Calc at 3.7 against Janus Calculator's 2.0. Calc also leads on update cadence (every 10 months vs every 45 months) and ratings volume (3 vs 1). Janus Calculator's advantage is review sentiment (83% vs 50%). On price, ads, in-app purchases and monetization model 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.
Calc holds the better App Store score, 3.7 against 2.0. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews complicate that: 83% of Janus Calculator's written reviews are positive against 50% of Calc's, so the app with the better star average is not the one people write more warmly about.
Janus Calculator ships an update every 45 months, Calc every 10 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.
| Parameter | Janus Calculator | Calc |
|---|---|---|
| Price | Free | Free |
| Rating | 2.0 (1 ratings) | 3.7 (3 ratings) — better |
| Positive reviews | 83.3% of reviews — better | 50.0% of reviews |
| Number of ratings | 1 | 3 — better |
| Update frequency | Every 45 months | Every 10 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 26.2 | 12.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 38 MB |
| Age rating | 4+ | 4+ |
| Developer | Geoffrey Domm | David Smith |
Customer experience
Janus Calculator
Calc
In-app purchases
Janus Calculator
No in-app purchases
Calc
No in-app purchases
