# i41CX+ vs ClouZen Clouder

The clearest difference is price: ClouZen Clouder at Free against i41CX+'s $24.99. ClouZen Clouder also leads on iOS requirement (13.0 vs 16.0). i41CX+'s advantage is update cadence (weekly vs fortnightly). On ads, in-app purchases and device support there is nothing between them.

ClouZen Clouder is free to download; i41CX+ costs $24.99 up front. Neither carries in-app purchases, so what you see is what you pay.

i41CX+ ships an update weekly, ClouZen Clouder fortnightly. The most recent releases landed on October 29, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | i41CX+ | ClouZen Clouder |
| --- | --- | --- |
| Price | $24.99 | **Free** |
| Rating | **[4.8 (107 ratings)](https://appshunter.io/ios/app/i41cx-plus/id289068865/reviews)** | — |
| Number of ratings | **107** | — |
| Positive reviews | 91.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Fortnightly |
| Monetization | Paid | — |
| Size | 124 MB | 25 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Antonio Lagana](https://appshunter.io/developer/289068868) | [ClouZen Co., Ltd.](https://appshunter.io/developer/1711150608) |

## 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

**Features:** iPhone Duo support

**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


### ClouZen Clouder

[App page](https://appshunter.io/ios/app/clouzen-clouder/id6468979592)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is i41CX+ free?

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

### Is ClouZen Clouder free?

ClouZen Clouder is free to download, with no in-app purchases.

### Do i41CX+ or ClouZen Clouder have ads?

Neither i41CX+ nor ClouZen Clouder shows ads.

### Which is updated more often, i41CX+ or ClouZen Clouder?

i41CX+ ships an update weekly, and ClouZen Clouder fortnightly. Most recently, i41CX+ was updated on October 29, 2026 and ClouZen Clouder on October 15, 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.*