# i48 vs RLM

The clearest difference is rating: RLM at 4.1 against i48's 3.5. RLM also leads on review sentiment (80% vs 54%) and update cadence (monthly vs every 4 months). i48's advantage is in-app purchases (none vs 4) and ratings volume (196 vs 17). On price, ads and device support there is nothing between them.

Both are free to download. RLM sells 4 in-app purchases, starting at $0.49 per month. i48 asks for nothing beyond the download.

RLM holds the better App Store score, 4.1 against 3.5. That said, the two scores are not equally well evidenced: i48 has 196 ratings behind it against 17, so its average is the more settled of the two. Written reviews point the same way: 54% of i48's written reviews are positive against 80% of RLM's.

i48 ships an update every 4 months, RLM monthly. The most recent releases landed on October 18, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | i48 | RLM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (196 ratings)](https://appshunter.io/ios/app/i48/id329454950/reviews) | **[4.1 (17 ratings)](https://appshunter.io/ios/app/rlm-15cx/id1636646608/reviews)** |
| Number of ratings | **196** | 17 |
| Positive reviews | 54.2% of reviews | **80.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 4 MB | 6 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Automagic Software Pty Ltd](https://appshunter.io/developer/329454953) | [R.L.M. Software](https://appshunter.io/developer/289639238) |

## What reviewers say

### i48

[App page](https://appshunter.io/ios/app/i48/id329454950)

This application emulates the HP48GX calculator on your iPhone or iPod touch. It allows you to perform complex calculations like matrix operations and function integration on the go.

**Highlights:** HP48GX calculator emulation, Matrix calculations, Function integration, Mobile calculator, On-the-go calculations

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Realistic HP48 emulation
- 🚀 Great functionality and features
- 💡 Useful unit conversions
- 👍 Familiar interface for HP48 users

**What reviewers complain about**

- 🐛 Freezes and crashes
- 🐛 Unresponsive buttons and input issues
- 🐛 Compatibility issues with newer iOS versions
- 🔋 Performance and battery drain problems

**Reported bugs**

- Memory recovery prompt not working
- Cursor keys behaving erratically
- Equation solver locking up the app
- Keyboard issues on certain devices

**Requested features**

- Landscape mode support
- Improved display resolution and graphics
- Haptic feedback for button presses
- Ability to assign units to numbers


### RLM

[App page](https://appshunter.io/ios/app/rlm-15cx/id1636646608)

This advanced scientific calculator emulates the functionality of the HP-15C, offering comprehensive tools for finance, business, statistics, and scientific calculations. It supports programming, equation solving, and unit conversions, optimized for iOS devices.

**Highlights:** Programmable advanced scientific calculator, Finance and business calculation menus, Statistics and probability functions, Complex numbers and matrix operations, Unit and currency conversions, Equation solver and programming capabilities

**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 |
| One-Time Purchase | $9.99 | one-time |


## Frequently asked questions

### Is i48 free?

i48 is free to download, with no in-app purchases.

### Is RLM free?

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

### Which has better reviews, i48 or RLM?

RLM is rated higher. i48 averages 3.5 out of 5 from 196 ratings, while RLM averages 4.1 from 17 ratings.

### Do i48 or RLM have ads?

Neither i48 nor RLM shows ads.

### Which is updated more often, i48 or RLM?

i48 ships an update every 4 months, and RLM monthly. Most recently, i48 was updated on October 18, 2026 and RLM 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.*