# RLM vs DB40X

The clearest difference is in-app purchases: DB40X at none against RLM's 4. On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. RLM sells 4 in-app purchases, starting at $0.49 per month. DB40X asks for nothing beyond the download.

RLM holds the better App Store score, 4.9 against 4.7. Both are backed by a comparable volume of ratings — 7 and 7 respectively. Written reviews split almost evenly too, at 67% and 67% positive.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on September 10, 2026 and June 4, 2026 respectively.

## The numbers

| Metric | RLM | DB40X |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (7 ratings)](https://appshunter.io/ios/app/rlm-19bx/id1597086394/reviews)** | [4.7 (7 ratings)](https://appshunter.io/ios/app/db40x/id6624315901/reviews) |
| Number of ratings | 7 | 7 |
| Positive reviews | 66.7% of reviews | 66.7% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Free with in-app purchases | **Free** |
| 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-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 |


### DB40X

[App page](https://appshunter.io/ios/app/db40x/id6624315901)

A high-precision scientific calculator inspired by the HP48 series, offering arbitrary precision computations, complex numbers, vectors, matrices, and graphing. It supports RPN and algebraic operations, with over 1000 built-in functions and a hyperlinked help system.

**Highlights:** Arbitrary precision computations, RPN and algebraic operations, Complex numbers, vectors, and matrices, Graphing and plotting, Engineering units and conversions, Hyperlinked help system

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RLM free?

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

### Is DB40X free?

DB40X is free to download, with no in-app purchases.

### Which has better reviews, RLM or DB40X?

RLM is rated higher. RLM averages 4.9 out of 5 from 7 ratings, while DB40X averages 4.7 from 7 ratings.

### Do RLM or DB40X have ads?

Neither RLM nor DB40X shows ads.

### Which is updated more often, RLM or DB40X?

RLM ships an update every 3 weeks, and DB40X every 3 weeks. Most recently, RLM was updated on September 10, 2026 and DB40X on June 4, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*