# RLM vs DB50X

The clearest difference is price: RLM at Free against DB50X's $9.99. DB50X's advantage is rating (5.0 vs 4.1) and in-app purchases (none vs 4). On ratings volume, update cadence, ads and device support there is nothing between them.

RLM is free to download; DB50X costs $9.99 up front. RLM sells 4 in-app purchases, starting at $0.49 per month. DB50X asks for nothing beyond the download.

DB50X holds the better App Store score, 5.0 against 4.1. Both are backed by a comparable volume of ratings — 17 and 8 respectively. Written reviews point the same way: 80% of RLM's written reviews are positive against 100% of DB50X's.

RLM ships an update monthly, DB50X every 3 weeks. The most recent releases landed on September 10, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | RLM | DB50X |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | [4.1 (17 ratings)](https://appshunter.io/ios/app/rlm-15cx/id1636646608/reviews) | **[5.0 (8 ratings)](https://appshunter.io/ios/app/db50x/id6625971367/reviews)** |
| Number of ratings | **17** | 8 |
| Positive reviews | 80.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 6 MB | 7 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [R.L.M. Software](https://appshunter.io/developer/289639238) | [Christophe de Dinechin](https://appshunter.io/developer/1761608161) |

## What reviewers say

### 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 |


### DB50X

[App page](https://appshunter.io/ios/app/db50x/id6625971367)

This scientific calculator offers high-precision computations with arbitrary precision for numbers. It supports advanced functions like complex numbers, matrices, symbolic calculations, and graphing, with a user-friendly interface and extensive built-in help.

**Highlights:** Arbitrary precision calculations, RPN and algebraic operations, Complex numbers, vectors, matrices, Symbolic and numerical solving, Graphing and plotting, Engineering units and constants, Unicode text support

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

**In-app purchases:** none


## Frequently asked questions

### Is RLM free?

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

### Is DB50X free?

DB50X costs $9.99, with no in-app purchases.

### Which has better reviews, RLM or DB50X?

DB50X is rated higher. RLM averages 4.1 out of 5 from 17 ratings, while DB50X averages 5.0 from 8 ratings.

### Do RLM or DB50X have ads?

Neither RLM nor DB50X shows ads.

### Which is updated more often, RLM or DB50X?

RLM ships an update monthly, and DB50X every 3 weeks. Most recently, RLM was updated on September 10, 2026 and DB50X on September 24, 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.*