# Copper vs RPN

The clearest difference is review sentiment: RPN at 100% against Copper's 47%. RPN also leads on rating (5.0 vs 3.3) and price ($1.99 vs $4.99). Copper's advantage is iOS requirement (9.3 vs 12.0). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

Copper costs $4.99 and RPN $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

RPN holds the better App Store score, 5.0 against 3.3. Both are backed by a comparable volume of ratings — 13 and 8 respectively. Written reviews point the same way: 47% of Copper's written reviews are positive against 100% of RPN's.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on October 12, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Copper | RPN |
| --- | --- | --- |
| Price | $4.99 | **$1.99** |
| Rating | [3.3 (13 ratings)](https://appshunter.io/ios/app/copper-eagle-cad-viewer/id1070984826/reviews) | **[5.0 (8 ratings)](https://appshunter.io/ios/app/rpn-55-sd/id1469907917/reviews)** |
| Number of ratings | **13** | 8 |
| Positive reviews | 47.4% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Paid | Paid |
| Size | 78 MB | 17 MB |
| Requires iOS | **9.3** | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Phillip Schuster](https://appshunter.io/developer/1048885754) | [CuVee Software](https://appshunter.io/developer/424873503) |

## What reviewers say

### Copper

[App page](https://appshunter.io/ios/app/copper-eagle-cad-viewer/id1070984826)

View and analyze EAGLE CAD files, including PCB layouts and schematics, directly on your mobile device. Create and render photorealistic 3D models of your PCBs with customizable lighting and materials. Organize your imported files into a convenient pocket library.

**Highlights:** View EAGLE CAD files, Analyze PCB layouts and schematics, Create 3D PCB models, Assign 3D models to footprints, Real-time photorealistic rendering, Import files from various sources, Organize files in a personal library

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

**In-app purchases:** none


### RPN

[App page](https://appshunter.io/ios/app/rpn-55-sd/id1469907917)

This app is a photo-realistic simulation of a classic Hewlett-Packard programmable scientific calculator from the 1970s. It includes a 100-hour digital timer, clock functions, and original HP programs.

**Highlights:** Photo-realistic look-and-feel, Programmable with conditional branching, 100-hr timer and 12/24-hr clock, Original HP programs built-in, Extended features for enhanced usability, Sharing via email, AirDrop, and more

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Copper free?

Copper costs $4.99, with no in-app purchases.

### Is RPN free?

RPN costs $1.99, with no in-app purchases.

### Which has better reviews, Copper or RPN?

RPN is rated higher. Copper averages 3.3 out of 5 from 13 ratings, while RPN averages 5.0 from 8 ratings.

### Do Copper or RPN have ads?

Neither Copper nor RPN shows ads.

### Which is updated more often, Copper or RPN?

Copper ships an update every 3 months, and RPN every 3 months. Most recently, Copper was updated on October 12, 2026 and RPN on October 20, 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.*