# RF Engineer's Calc vs VibeSDR

The clearest difference is price: RF Engineer's Calc at Free against VibeSDR's $2.99. VibeSDR's advantage is update cadence (every 2 weeks vs every 10 months) and device support (3 vs 1). On ads, in-app purchases and iOS requirement there is nothing between them.

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

RF Engineer's Calc ships an update every 10 months, VibeSDR every 2 weeks. Both last shipped on October 6, 2026.

## The numbers

| Metric | RF Engineer's Calc | VibeSDR |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/vibesdr/id6786344049/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 2 weeks** |
| Monetization | — | Paid |
| Size | 43 MB | 52 MB |
| Requires iOS | **16.1** | 16.4 |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [GRAHAM JOHN SMITH](https://appshunter.io/developer/1668396908) | [Stuart Carr](https://appshunter.io/developer/6786344051) |

## What reviewers say

### RF Engineer's Calc

[App page](https://appshunter.io/ios/app/rf-engineers-calc/id1668396906)

**Features:** macOS Compatibility

**In-app purchases:** none


### VibeSDR

[App page](https://appshunter.io/ios/app/vibesdr/id6786344049)

This app acts as a versatile receiver client for various software-defined radio servers. It offers advanced display, tuning, and audio features, along with on-device decoders and voice control for a comprehensive radio experience.

**Highlights:** Connects to multiple SDR server protocols, GPU-rendered waterfall and spectrum display, Native background audio playback, On-device decoders for RTTY, NAVTEX, WEFAX, SSTV, Morse, Voice control via Siri, CarPlay and Apple Watch integration, Deep linking for station tuning

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is RF Engineer's Calc free?

RF Engineer's Calc is free to download, with no in-app purchases.

### Is VibeSDR free?

VibeSDR costs $2.99, with no in-app purchases.

### Do RF Engineer's Calc or VibeSDR have ads?

Neither RF Engineer's Calc nor VibeSDR shows ads.

### Which is updated more often, RF Engineer's Calc or VibeSDR?

RF Engineer's Calc ships an update every 10 months, and VibeSDR every 2 weeks. Most recently, RF Engineer's Calc was updated on October 6, 2026 and VibeSDR on October 6, 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.*