# Janus Calculator vs 1000digit Calc

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.

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.

## The numbers

| Metric | Janus Calculator | 1000digit Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (1 ratings)](https://appshunter.io/ios/app/janus-calculator/id373378721/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/1000digit-calc/id6463856899/reviews)** |
| Number of ratings | 1 | 1 |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 45 months | **Weekly** |
| Monetization | Free | Free |
| Size | 1 MB | 5 MB |
| Requires iOS | 26.2 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Geoffrey Domm](https://appshunter.io/developer/373378724) | [Yukihiro Shioya](https://appshunter.io/developer/1565306192) |

## What reviewers say

### Janus Calculator

[App page](https://appshunter.io/ios/app/janus-calculator/id373378721)

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.

**Highlights:** Dual calculator interface (Standard and RPN), Programmable functions, Finance and scientific functions, Physical constants, Black-Scholes option calculator, Implied value calculation

**Features:** macOS Compatibility

**In-app purchases:** none


### 1000digit Calc

[App page](https://appshunter.io/ios/app/1000digit-calc/id6463856899)

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.

**Highlights:** 1,000-digit integer calculations, Parentheses support for formula order, Automatic clipboard saving of results, Four basic arithmetic operations, Cross-application result reuse

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Janus Calculator free?

Janus Calculator is free to download, with no in-app purchases.

### Is 1000digit Calc free?

1000digit Calc is free to download, with no in-app purchases.

### Which has better reviews, Janus Calculator or 1000digit Calc?

1000digit Calc is rated higher. Janus Calculator averages 2.0 out of 5 from 1 ratings, while 1000digit Calc averages 5.0 from 1 ratings.

### Do Janus Calculator or 1000digit Calc have ads?

Neither Janus Calculator nor 1000digit Calc shows ads.

### Which is updated more often, Janus Calculator or 1000digit Calc?

Janus Calculator ships an update every 45 months, and 1000digit Calc weekly. Most recently, Janus Calculator was updated on October 21, 2026 and 1000digit Calc on October 27, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*