Plus42 vs Cytiva XChangr
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Plus42
This advanced scientific calculator simulates the classic HP-42S RPN calculator with enhanced features. It offers algebraic expressions, unit conversions, directories for storage, a larger resizable display, financial functions, and 2D plotting with integral and root finding.
- HP-42S RPN calculator simulation
- Algebraic expressions
- Attached units and conversions
- Program and variable directories
- Resizable 8-row, 22-column display
- Time value of money and amortization
- 2D function plotting with zoom and pan
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Plus42 is an advanced scientific programmable calculator, based on Free42. Free42, in turn, is a complete re-implementation of the HP-42S scientific programmable RPN calculator, which was made from 1988 until 1995 by Hewlett-Packard. Free42 is a complete rewrite and contains no HP code whatsoever. Plus42 builds on Free42 and adds: Algebraic expressions modeled after those used on the HP-27S and HP-17B/19B; attached units and unit conversions modeled after those used on the HP-48/49/50 series; directories for more organized storage of programs and variables; a larger display, with 8 rows and 22 columns (131x64 pixels) by default, which the user may resize at will; time value of money and amortization schedules; and two-dimensional plotting of functions, with ability to zoom and pan, and find integrals and roots from points in the plot.
Cytiva XChangr
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Easy to use Medical filter Exchange documentation tool
Screenshots
Verdict
The clearest difference is price: Cytiva XChangr at Free against Plus42's $9.99. Plus42's advantage is update cadence (weekly vs every 8 months) and chart position (#119 vs unranked). On ads, in-app purchases, device support and iOS requirement 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
Cytiva XChangr is free to download; Plus42 costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Plus42 ships an update weekly, Cytiva XChangr every 8 months. Both last shipped on October 30, 2026.
| Parameter | Plus42 | Cytiva XChangr |
|---|---|---|
| Price | $9.99 | Free — better |
| Rating | 4.9 (79 ratings) — better | — |
| Positive reviews | 92.3% of reviews | — |
| Number of ratings | 79 — better | — |
| Update frequency | Weekly — better | Every 8 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Best chart rank | #119 — better | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 11 MB | 45 MB |
| Age rating | 4+ | 4+ |
| Developer | Thomas Okken | GLOBAL LIFE SCIENCES SOLUTIONS USA LLC |
In-app purchases
Plus42
No in-app purchases
Cytiva XChangr
No in-app purchases
