Janus Calculator vs 1000digit 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
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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.
1000digit Calc
Perform arithmetic operations on integers up to 1,000 digits. Supports parentheses for complex calculations and automatically saves results to the clipboard for easy reuse in other applications.
- 1,000-digit integer calculations
- Parentheses support for formula order
- Automatic clipboard saving of results
- Four basic arithmetic operations
- Cross-application result reuse
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This is a calculator that can perform four arithmetic operations on integers up to about 1,000 digits. You can use parentheses in formulas, so you can calculate in the same order as in the formula. Calculation results are saved to the clipboard each time, so they can be reused in other applications.
Screenshots
Verdict
The clearest difference is rating: 1000digit Calc at 5.0 against Janus Calculator's 2.0. 1000digit Calc also leads on update cadence (weekly vs every 45 months) and iOS requirement (15.0 vs 26.2). On price, ratings volume, ads and in-app purchases 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.
1000digit Calc holds the better App Store score, 5.0 against 2.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
Janus Calculator ships an update every 45 months, 1000digit Calc weekly. The most recent releases landed on October 21, 2026 and October 27, 2026 respectively.
| Parameter | Janus Calculator | 1000digit Calc |
|---|---|---|
| Price | Free | Free |
| Rating | 2.0 (1 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 83.3% of reviews | — |
| Number of ratings | 1 | 1 |
| Update frequency | Every 45 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 26.2 | 15.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Geoffrey Domm | Yukihiro Shioya |
In-app purchases
Janus Calculator
No in-app purchases
1000digit Calc
No in-app purchases
Questions
Is Janus Calculator free?
Is 1000digit Calc free?
Which has better reviews, Janus Calculator or 1000digit Calc?
Do Janus Calculator or 1000digit Calc have ads?
Which is updated more often, Janus Calculator or 1000digit Calc?
Other comparisons
