# i41CX vs PDFShare

The clearest difference is price: PDFShare at Free against i41CX's $7.99. PDFShare also leads on update cadence (every 3 days vs every 5 weeks). i41CX's advantage is chart position (#139 vs unranked) and iOS requirement (15.0 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

PDFShare is free to download; i41CX costs $7.99 up front. i41CX sells 4 one-off in-app purchases and PDFShare sells 2 in-app purchases, starting at $0.99 per 6 months. Whichever you choose, the download price is not the number that matters.

i41CX ships an update every 5 weeks, PDFShare every 3 days. The most recent releases landed on September 30, 2026 and June 4, 2026 respectively.

## The numbers

| Metric | i41CX | PDFShare |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Rating | **[4.6 (45 ratings)](https://appshunter.io/ios/app/i41cx/id292619450/reviews)** | — |
| Number of ratings | **45** | — |
| Positive reviews | 90.5% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 3 days** |
| Monetization | Free with in-app purchases | — |
| Best chart rank | **#139** | — |
| Size | 135 MB | 3 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Antonio Lagana](https://appshunter.io/developer/289068868) | [勇 崔](https://appshunter.io/developer/1133151519) |

## What reviewers say

### i41CX

[App page](https://appshunter.io/ios/app/i41cx/id292619450)

**Currently charting:** #139 Top Paid · Productivity (US App Store)

This app offers a powerful RPN scientific calculator experience, functionally equivalent to a renowned model. It provides extensive memory registers, over 300 built-in functions, and programmability. Advanced features can be unlocked via in-app purchases.

**Highlights:** RPN logic with 4-element stack, 319 main and 124 extended memory registers, Over 300 built-in functions, Programmable up to 2000 lines, User-definable keyboard, Bluetooth keyboard support, Device integration features

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Overlays Upgrade | $2.99 | one-time |
| Printer Upgrade | $3.99 | one-time |
| CAS Upgrade | $7.99 | one-time |
| i41CX+ Features Upgrade | $17.99 | one-time |


### PDFShare

[App page](https://appshunter.io/ios/app/pdfshare/id6468026357)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Individual | $0.99 | per 6 months |
| Family | $1.99 | per 6 months |


## Frequently asked questions

### Is i41CX free?

i41CX costs $7.99, and also offers in-app purchases.

### Is PDFShare free?

PDFShare is free to download, with in-app purchases available.

### Do i41CX or PDFShare have ads?

Neither i41CX nor PDFShare shows ads.

### Which is updated more often, i41CX or PDFShare?

i41CX ships an update every 5 weeks, and PDFShare every 3 days. Most recently, i41CX was updated on September 30, 2026 and PDFShare on June 4, 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.*