# i41CX+ vs HVAC Load Plus

The clearest difference is rating: i41CX+ at 4.8 against HVAC Load Plus's 2.8. i41CX+ also leads on in-app purchases (none vs 1) and review sentiment (91% vs 60%). HVAC Load Plus's advantage is chart position (#199 vs unranked). On price, ads, monetization model and device support there is nothing between them.

i41CX+ costs $24.99 and HVAC Load Plus $24.99 up front. HVAC Load Plus sells 1 one-off in-app purchase. i41CX+ asks for nothing beyond the download.

i41CX+ holds the better App Store score, 4.8 against 2.8. That said, the two scores are not equally well evidenced: i41CX+ has 106 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 91% of i41CX+'s written reviews are positive against 60% of HVAC Load Plus's.

i41CX+ ships an update every 5 weeks, HVAC Load Plus every 9 months. The most recent releases landed on September 23, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | i41CX+ | HVAC Load Plus |
| --- | --- | --- |
| Price | $24.99 | $24.99 |
| Rating | **[4.8 (106 ratings)](https://appshunter.io/ios/app/i41cx-plus/id289068865/reviews)** | [2.8 (5 ratings)](https://appshunter.io/ios/app/hvac-load-plus/id381608273/reviews) |
| Number of ratings | **106** | 5 |
| Positive reviews | **91.3% of reviews** | 60.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 9 months |
| Monetization | Paid | Paid |
| Best chart rank | — | **#199** |
| Size | 123 MB | 18 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Antonio Lagana](https://appshunter.io/developer/289068868) | [Carmel Software Corporation](https://appshunter.io/developer/317970398) |

## What reviewers say

### i41CX+

[App page](https://appshunter.io/ios/app/i41cx-plus/id289068865)

This advanced RPN scientific calculator offers workstation-class Computer Algebra System (CAS) capabilities, going beyond traditional replicas. It provides access to an extensive library of modules and programs, enhanced with iOS features, customizable skins, and iCloud support for seamless data management.

**Highlights:** RPN logic with 4-element stack, Extensive memory registers, Over 400 built-in functions, Computer Algebra System (CAS), Virtual thermal printer/plotter, Access to HP-41 module library, Customizable skins and keyboard overlays

**In-app purchases:** none

**What reviewers like**

- 🚀 Fantastic emulation of the original HP41 calculator
- 🔒 Faithful to the original hardware and functionality
- 👍 Includes all the expansion modules and accessories
- 👍 Responsive and never crashes
- 👍 Excellent implementation of RPN and programmability

**What reviewers complain about**

- 🔋 Can drain battery when left on
- 👎 Small button size can lead to mis-taps
- 👎 Slow startup time in some versions

**Reported bugs**

- Issues with the 41Z math module producing garbled output
- Scaling problems with overlays

**Requested features**

- Landscape mode for better button size
- Haptic feedback for button presses
- Ability to load and save programs/modules via cloud/email
- Macros or scripting support


### HVAC Load Plus

[App page](https://appshunter.io/ios/app/hvac-load-plus/id381608273)

**Currently charting:** #199 Top Paid · Productivity (US App Store)

Perform detailed heating and cooling load calculations for buildings in the field using your iPhone. Access a vast weather database and construction data to generate comprehensive reports that can be emailed or exported to spreadsheets.

**Highlights:** Detailed heating and cooling load calculations, 1000+ city weather database, Extensive construction type data, Unlimited project creation and storage, Comprehensive load breakdown reports, Emailable HTML reports with spreadsheet attachments, Company information display on reports

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HVAC Equipment Locator | $9.99 | one-time |


## Frequently asked questions

### Is i41CX+ free?

i41CX+ costs $24.99, with no in-app purchases.

### Is HVAC Load Plus free?

HVAC Load Plus costs $24.99, and also offers in-app purchases.

### Which has better reviews, i41CX+ or HVAC Load Plus?

i41CX+ is rated higher. i41CX+ averages 4.8 out of 5 from 106 ratings, while HVAC Load Plus averages 2.8 from 5 ratings.

### Do i41CX+ or HVAC Load Plus have ads?

Neither i41CX+ nor HVAC Load Plus shows ads.

### Which is updated more often, i41CX+ or HVAC Load Plus?

i41CX+ ships an update every 5 weeks, and HVAC Load Plus every 9 months. Most recently, i41CX+ was updated on September 23, 2026 and HVAC Load Plus on September 9, 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.*