# i41CX vs RLM

The clearest difference is price: RLM at Free against i41CX's $7.99. RLM also leads on rating (4.9 vs 4.6). i41CX's advantage is review sentiment (90% vs 67%) and update cadence (weekly vs every 4 weeks). On ads, in-app purchases, monetization model and device support there is nothing between them.

RLM is free to download; i41CX costs $7.99 up front. i41CX sells 4 one-off in-app purchases and RLM sells 4 in-app purchases, starting at $0.49 per month. Whichever you choose, the download price is not the number that matters.

RLM holds the better App Store score, 4.9 against 4.6. That said, the two scores are not equally well evidenced: i41CX has 45 ratings behind it against 7, so its average is the more settled of the two. Written reviews complicate that: 90% of i41CX's written reviews are positive against 67% of RLM's, so the app with the better star average is not the one people write more warmly about.

i41CX ships an update weekly, RLM every 4 weeks. The most recent releases landed on October 26, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | i41CX | RLM |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Rating | [4.6 (45 ratings)](https://appshunter.io/ios/app/i41cx/id292619450/reviews) | **[4.9 (7 ratings)](https://appshunter.io/ios/app/rlm-19bx/id1597086394/reviews)** |
| Number of ratings | **45** | 7 |
| Positive reviews | **90.5% of reviews** | 66.7% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 4 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | **#149** | — |
| Size | 135 MB | 7 MB |
| Requires iOS | **16.0** | 26.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Antonio Lagana](https://appshunter.io/developer/289068868) | [R.L.M. Software](https://appshunter.io/developer/289639238) |

## What reviewers say

### i41CX

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

**Currently charting:** #149 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 |


### RLM

[App page](https://appshunter.io/ios/app/rlm-19bx/id1597086394)

This app offers a comprehensive suite of financial, business, scientific, and statistical calculators. It includes specialized worksheets for loan amortization, bond pricing, currency exchange, probability distributions, and complex number operations. Users can also perform date and time calculations, solve arbitrary equations, and convert units.

**Highlights:** Finance worksheets (amortization, bonds, options), Business tools (bill split, break-even, currency), Statistical analysis (probability, regressions), Scientific functions (complex numbers, vectors), Unit and currency conversions, Equation solver, Date and time calculations

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $0.49 | per month |
| Semi-Annual Subscription | $2.99 | per 6 months |
| Annual Subscription | $5.99 | per year |
| Lifetime Purchase | $9.99 | one-time |


## Frequently asked questions

### Is i41CX free?

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

### Is RLM free?

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

### Which has better reviews, i41CX or RLM?

RLM is rated higher. i41CX averages 4.6 out of 5 from 45 ratings, while RLM averages 4.9 from 7 ratings.

### Do i41CX or RLM have ads?

Neither i41CX nor RLM shows ads.

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

i41CX ships an update weekly, and RLM every 4 weeks. Most recently, i41CX was updated on October 26, 2026 and RLM on October 25, 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.*