# Janus Calculator vs Length Converter Plus

The clearest difference is review sentiment: Janus Calculator at 83% against Length Converter Plus's 0%. Janus Calculator also leads on rating (2.0 vs 1.0) and ads (none vs shown). Length Converter Plus's advantage is update cadence (every 12 months vs every 45 months) and iOS requirement (14.0 vs 26.2). On price, ratings volume, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Janus Calculator holds the better App Store score, 2.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews point the same way: 83% of Janus Calculator's written reviews are positive against 0% of Length Converter Plus's.

Janus Calculator ships an update every 45 months, Length Converter Plus every 12 months. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Janus Calculator | Length Converter Plus |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.0 (1 ratings)](https://appshunter.io/ios/app/janus-calculator/id373378721/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/length-converter-plus/id982843030/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | **83.3% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 45 months | **Every 12 months** |
| Monetization | **Free** | Ad-supported |
| Size | 1 MB | 6 MB |
| Requires iOS | 26.2 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Geoffrey Domm](https://appshunter.io/developer/373378724) | [Hideshi Otsuru](https://appshunter.io/developer/446092368) |

## 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


### Length Converter Plus

[App page](https://appshunter.io/ios/app/length-converter-plus/id982843030)

Easily convert between various units of length, from micrometers to miles. Includes a built-in calculator for added convenience.

**Highlights:** Converts 10 different length units, Includes Micrometer, Millimeter, Centimeter, Converts Meter, Kilometer, Inch, Feet, Converts Yard, Mile, Nautical miles, Built-in calculator functionality

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Janus Calculator free?

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

### Is Length Converter Plus free?

Length Converter Plus is free to download, with no in-app purchases.

### Which has better reviews, Janus Calculator or Length Converter Plus?

Janus Calculator is rated higher. Janus Calculator averages 2.0 out of 5 from 1 ratings, while Length Converter Plus averages 1.0 from 1 ratings.

### Do Janus Calculator or Length Converter Plus have ads?

Length Converter Plus shows ads; Janus Calculator does not.

### Which is updated more often, Janus Calculator or Length Converter Plus?

Janus Calculator ships an update every 45 months, and Length Converter Plus every 12 months. Most recently, Janus Calculator was updated on October 21, 2026 and Length Converter Plus on October 24, 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.*