# CoronaSDR: RTL-SDR Client — Low-Latency rtl_tcp Receiver

> iOS client for controlling rtl_tcp SDR servers over a local network. (iPhone/iPad app by Alien Systems S.R.L..)

- Source: https://appshunter.io/ios/app/coronasdr-rtl-sdr-client/id6759222137 (this page in markdown: same URL + `.md`)
- Developer: [Alien Systems S.R.L.](https://appshunter.io/developer/1047123293)
- Category: Utilities, Education
- Price: Free
- Rating: 5.00/5 from 5 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 18.0 · 5 MB
- Languages: English
- Released: 2026-03-03
- Data updated: 2026-08-05
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/coronasdr-rtl-sdr-client/id6759222137/reviews.md

## What is CoronaSDR?

CoronaSDR is an iOS app for listening to rtl_tcp SDR servers over your local network.

  Key features:

  - Live spectrum and waterfall rendering
  - Demodulation modes: AM, NFM, WFM, USB, LSB, CW
  - DSP controls: squelch, AGC, audio filters, de-emphasis
  - Station favorites with import/export
  - RF controls such as PPM and tuner options (hardware/server dependent)
  - Diagnostics and a performance-focused pipeline

  No account is required. Set your rtl_tcp host and port, connect, and tune.

  Built by Silviu YO6SAY for the radio community.

## Key features

- Live spectrum and waterfall display
- Multiple demodulation modes (AM, NFM, WFM, USB, LSB, CW)
- DSP controls (squelch, AGC, filters)
- Station favorites with import/export
- RF controls (PPM, tuner options)
- Diagnostics and performance pipeline

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/coronasdr-rtl-sdr-client/id6759222137/reviews.md

### 5/5 — How is this free?

*2026-03-23*

Fantastic app, clean intuitive design.

**Developer response:** Thank you!

### 5/5 — Great app

*2026-03-22*

I was waiting for an app like this for long time! It is perfectly developed, thank you!

**Developer response:** Thank you!

### 5/5 — Great app

*2026-03-20*

Works great - it allows me to listen to my favorite frequencies.

**Developer response:** Thank you!

## Frequently asked questions about CoronaSDR

### What is CoronaSDR?

CoronaSDR is a free iOS application designed to connect to and control rtl_tcp SDR servers over your local network. It offers live spectrum and waterfall displays, various demodulation modes, and DSP controls.

### Does CoronaSDR require an account?

No, CoronaSDR does not require any account creation. Users can simply set their rtl_tcp host and port, connect, and begin tuning.

### What devices does CoronaSDR support?

CoronaSDR is available for iPhone and iPad devices.

### What demodulation modes are available in CoronaSDR?

CoronaSDR supports AM, NFM, WFM, USB, LSB, and CW demodulation modes, providing flexibility for various radio signals.

### Can I save my favorite radio stations in CoronaSDR?

Yes, CoronaSDR allows you to save your favorite stations and provides options for importing and exporting these lists.

### How often is CoronaSDR updated?

The latest version, 1.0.2, was released on March 20, 2026, indicating recent development activity. The app was first released on March 3, 2026.

### What is the age rating for CoronaSDR?

CoronaSDR has an age rating of 4+, making it suitable for a wide range of users.

### Does CoronaSDR have ads?

No, CoronaSDR does not contain advertisements. It is a completely free application.

## Version history (last 5 releases)

### 1.0.7 — 2026-06-13

- Improved WFM stereo decoding for better channel separation.
- Fixed an issue where stereo audio could collapse back to mono after a few seconds.
- Improved 19 kHz pilot tracking and 38 kHz stereo subcarrier recovery.
- Added additional validation for left/right channel polarity, pilot loss handling, and mono fallback.
- General DSP stability improvements for broadcast FM audio.

### 1.0.3 — 2026-04-15

- Improved SDR tuning and FM reception quality.
- Better offset tuning, wide FM filtering, and HF+ Low sample-rate handling.
- More stable retuning across frequency, mode, and RF control changes.

### 1.0.2 — 2026-03-20

- Improved FM audio quality with advanced noise filtering
- Fixed audio glitches when switching processing profiles
- Settings button shown when network permission is needed
- Fixed frequency keypad layout on Mac

### 1.0.1 — 2026-03-19

- Tap or drag the waterfall to tune frequencies
- Pinch-to-zoom on the waterfall spectrum
- Quick settings accessible from the radio screen
- Scan tag filtering and saveable range scan presets
- Airspy HF+ Discovery sample rate profiles
- Waterfall and UI bug fixes

### 1.0.0 — 2026-03-03

No release notes.

## More apps by Alien Systems S.R.L.

- [LetMeBe: Block Apps, IPs/Hosts](https://appshunter.io/ios/app/letmebe-block-apps-ipshosts/id1564789268)
- [Latry - a tiny svxlink client](https://appshunter.io/ios/app/latry-a-tiny-svxlink-client/id6751135709)

All apps by Alien Systems S.R.L.: https://appshunter.io/developer/1047123293

## Related topics

[rtl sdr](https://appshunter.io/ios/topics/rtl-sdr) · [sdr receiver](https://appshunter.io/ios/topics/sdr-receiver) · [sdr radio](https://appshunter.io/ios/topics/sdr-radio) · [echo sdr](https://appshunter.io/ios/topics/echo-sdr) · [sdr control](https://appshunter.io/ios/topics/sdr-control) · [sdr](https://appshunter.io/ios/topics/sdr) · [sdr touch](https://appshunter.io/ios/topics/sdr-touch) · [ham radio receiver](https://appshunter.io/ios/topics/ham-radio-receiver) · [kiwi sdr](https://appshunter.io/ios/topics/kiwi-sdr) · [udr](https://appshunter.io/ios/topics/udr)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-05.*