# Calculator HD vs RLM

The clearest difference is in-app purchases: Calculator HD at none against RLM's 1. Calculator HD also leads on iOS requirement (9.0 vs 15.0). RLM's advantage is update cadence (every 4 weeks vs every 6 months). On price, ads and device support there is nothing between them.

Both are free to download. RLM sells 1 one-off in-app purchase. Calculator HD asks for nothing beyond the download.

Calculator HD ships an update every 6 months, RLM every 4 weeks. Both last shipped on November 3, 2026.

## The numbers

| Metric | Calculator HD | RLM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rlm-10cx/id6466089794/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 4 weeks** |
| Monetization | — | Free |
| Size | 24 MB | 6 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Zhuhai Record Yi Technology Co.,Ltd.](https://appshunter.io/developer/1638483191) | [R.L.M. Software](https://appshunter.io/developer/289639238) |

## What reviewers say

### Calculator HD

[App page](https://appshunter.io/ios/app/calculator-hd-scientific/id1658965963)

**Features:** macOS Compatibility

**In-app purchases:** none


### RLM

[App page](https://appshunter.io/ios/app/rlm-10cx/id6466089794)

This scientific calculator offers a comprehensive suite of tools for finance, business, statistics, and complex scientific calculations. It emulates a classic calculator while leveraging modern iOS device capabilities for ease of use and advanced functions.

**Highlights:** Finance and Business calculations, Date and Time interval calculations, Advanced Statistics and Curve Fitting, Complex Numbers and 3D Vectors, Unit and Currency Conversions, Equation Solver, Programmable functions

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Purchase | $9.99 | one-time |


## Frequently asked questions

### Is Calculator HD free?

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

### Is RLM free?

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

### Do Calculator HD or RLM have ads?

Neither Calculator HD nor RLM shows ads.

### Which is updated more often, Calculator HD or RLM?

Calculator HD ships an update every 6 months, and RLM every 4 weeks. Most recently, Calculator HD was updated on November 3, 2026 and RLM on November 3, 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.*