# treVolo U vs SDR

The clearest difference is price: treVolo U at Free against SDR's $44.99. treVolo U also leads on device support (3 vs 1) and iOS requirement (12.1 vs 17.6). SDR's advantage is update cadence (every 2 weeks vs every 2 months) and chart position (#143 vs unranked). On ads and in-app purchases there is nothing between them.

treVolo U is free to download; SDR costs $44.99 up front. Neither carries in-app purchases, so what you see is what you pay.

treVolo U ships an update every 2 months, SDR every 2 weeks. Both last shipped on October 30, 2026.

## The numbers

| Metric | treVolo U | SDR |
| --- | --- | --- |
| Price | **Free** | $44.99 |
| Rating | — | **[4.6 (67 ratings)](https://appshunter.io/ios/app/sdr-control-mobile/id1673327509/reviews)** |
| Number of ratings | — | **67** |
| Positive reviews | — | 84.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | — | Paid |
| Best chart rank | — | **#143** |
| Size | 130 MB | 55 MB |
| Requires iOS | **12.1** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [BenQ Corporation](https://appshunter.io/developer/503100832) | [Marcus Roskosch](https://appshunter.io/developer/334053438) |

## What reviewers say

### treVolo U

[App page](https://appshunter.io/ios/app/trevolo-u/id1565297439)

**Features:** macOS Compatibility

**In-app purchases:** none


### SDR

[App page](https://appshunter.io/ios/app/sdr-control-mobile/id1673327509)

**Currently charting:** #143 Top Paid · Utilities (US App Store)

Control your Icom radio remotely from your iPhone. View spectrum scope, waterfall, and access all radio controls over Wi-Fi or the internet. Supports various Icom models and includes features for ham radio operators.

**Highlights:** Spectrum scope and waterfall display, Full radio control, Remote operation over Wi-Fi/internet, FT8-Improved and JS8 modes, CW decoder and keyer, Speech transcription and translation, Logbook with ADIF import/export

**Features:** iPhone Duo support

**In-app purchases:** none

**What reviewers like**

- 🚀 Works perfectly with ICOM radios
- 👍 Intuitive and easy to use
- 🌟 Feature-rich and comprehensive
- 💯 Stable and reliable performance
- 📱 Great for remote operation

**What reviewers complain about**

- 🐛 FT8 decoding issues (lower signal levels)
- 🐛 Dialogs do not scale with larger text setting
- 🐛 UI elements can be cramped on iPhone
- 🐛 Some buttons are small and hard to press
- 🐛 Frequency display overlaps buttons

**Reported bugs**

- Dialogs do not scale with larger text setting
- Frequency display overlaps buttons
- FT8 decoding issues (lower signal levels than WSJTX)
- App crashes and leaves radio in transmit
- Logbook export not functional after update

**Requested features**

- Develop for IC-7800
- CarPlay support
- Apple Watch add-on
- Windows version
- JS8call support


## Frequently asked questions

### Is treVolo U free?

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

### Is SDR free?

SDR costs $44.99, with no in-app purchases.

### Do treVolo U or SDR have ads?

Neither treVolo U nor SDR shows ads.

### Which is updated more often, treVolo U or SDR?

treVolo U ships an update every 2 months, and SDR every 2 weeks. Most recently, treVolo U was updated on October 30, 2026 and SDR on October 30, 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.*