# RF Link Calc vs ClawShelf

The clearest difference is review sentiment: ClawShelf at 100% against RF Link Calc's 20%. ClawShelf also leads on price (Free vs $2.99). RF Link Calc's advantage is iOS requirement (9.0 vs 13.0). On ads, in-app purchases and device support there is nothing between them.

ClawShelf is free to download; RF Link Calc costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | RF Link Calc | ClawShelf |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[2.3 (3 ratings)](https://appshunter.io/ios/app/rf-link-calc/id303034300/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 20.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 40 months | — |
| Monetization | Paid | **Free** |
| Size | 4 MB | 34 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Black Cat Systems](https://appshunter.io/developer/301047032) | [智荣 覃](https://appshunter.io/developer/1523481908) |

## What reviewers say

### RF Link Calc

[App page](https://appshunter.io/ios/app/rf-link-calc/id303034300)

This tool helps radio engineers calculate RF link characteristics, including wireless internet links. It computes maximum distance, required transmitter power, or gain margin by inputting various parameters. It also calculates EIRP, ERP, and field strength in multiple units.

**Highlights:** RF link modeling, Wireless internet link calculations, Maximum distance computation, Transmitter power calculation, Gain margin calculation, EIRP/ERP calculator, Field strength calculator

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

**In-app purchases:** none


### ClawShelf

[App page](https://appshunter.io/ios/app/clawshelf-openclaw-docs/id6758986679)

This app provides offline access to comprehensive documentation for OpenClaw engineers. It features sub-millisecond search, a complete library of skills and configurations, and a privacy-first design with no data collection. Optimized for professionals, it ensures critical data is always accessible.

**Highlights:** Offline documentation access, Sub-millisecond search speed, Complete OpenClaw library (600+ skills), Privacy-first, no data collection, High-density UI for code reading, Dark mode optimization

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RF Link Calc free?

RF Link Calc costs $2.99, with no in-app purchases.

### Is ClawShelf free?

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

### Do RF Link Calc or ClawShelf have ads?

Neither RF Link Calc nor ClawShelf shows ads.

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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.*