Janus Calculator vs Length Converter Plus
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.
Length Converter Plus
Easily convert between various units of length, from micrometers to miles. Includes a built-in calculator for added convenience.
- Converts 10 different length units
- Includes Micrometer, Millimeter, Centimeter
- Converts Meter, Kilometer, Inch, Feet
- Converts Yard, Mile, Nautical miles
- Built-in calculator functionality
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It is an application that converts a unit of length. The corresponding unit: Micrometer,Millimeter,Centimeter,Meter,Kilometer,Inch,Feet,Yard,Mile,Nautical miles You can also use the calculator.
Screenshots
Verdict
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.
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 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.
| Parameter | Janus Calculator | Length Converter Plus |
|---|---|---|
| Price | Free | Free |
| Rating | 2.0 (1 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 83.3% of reviews — better | 0.0% of reviews |
| Number of ratings | 1 | 1 |
| Update frequency | Every 45 months | Every 12 months — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 26.2 | 14.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Geoffrey Domm | Hideshi Otsuru |
Customer experience
Janus Calculator
Length Converter Plus
In-app purchases
Janus Calculator
No in-app purchases
Length Converter Plus
No in-app purchases
Questions
Is Janus Calculator free?
Is Length Converter Plus free?
Which has better reviews, Janus Calculator or Length Converter Plus?
Do Janus Calculator or Length Converter Plus have ads?
Which is updated more often, Janus Calculator or Length Converter Plus?
Other comparisons
