Echo: Global SDR Receiver

Echo: Global SDR Receiver

SDR Tuner, Shortwave & Scanner

30 ratings
15 reviews
Free

Details

  • Released
  • Updated
  • March 31, 2026
  • August 27, 2026

Features

Echo: Global SDR Receiver video #1 for iPhone
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About

Tune into thousands of remote radio servers worldwide from your iPhone or iPad. Explore shortwave broadcasts, aviation communications, and more with a global interactive map and advanced tuning features. Enjoy uninterrupted background audio and a privacy-first experience.

Global interactive map and search
Support for multiple SDR architectures
Scanner mode and OpenMHz archives
Pro-level tuning and analytics
Offline frequency library and logging
Uninterrupted background audio
Privacy-first design
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What's New in Echo

1.2

August 27, 2026

Echo 1.2 brings complete compatibility for iOS 27 and a massive rebuild of OpenWebRX support. If you use OpenWebRX receivers, you'll notice a much smoother, faster experience. OPENWEBRX • Dramatically improved loading speeds. Receivers now open almost instantly thanks to smarter interface caching. • Fixed an issue preventing receivers from loading correctly on iOS 27. • Map, chat, help, and status links within the receiver interface are now fully functional across all server types. • Added a dedicated back control to easily return to the radio from secondary pages. • Added a new MENU control in the player header to toggle the receiver's native top bar, giving you more screen space when you want it. • Fixed an issue where some servers would incorrectly switch tuning modes during connection. OTHER RECEIVERS • KiwiSDR: Resolved an issue that could cause the receiver to continuously reload. • WebSDR: Fixed precision tuning for fractional kHz frequencies, ensuring SSB and CW signals come in crystal clear. AUDIO • Audio reliably resumes after interruptions like phone calls or Siri. • Updated the core audio engine for full iOS 27 compatibility. EVERYTHING ELSE • Fixed an alert on some stations that could not be dismissed. • Notes on saved servers now reliably persist between app sessions. • Updated the offline shortwave frequency database for the A26 season. • Refreshed the hot list. • Streamlined the interface by removing legacy SNR sorting and badges. • Visual refinements and UI cleanups throughout for iOS 27.

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User reviews

Excellent

Thank you. iOS has been needing an app like those for way too long!

Function and interface are flawless and easy to navigate so far for me. Primary use is amateur radio.

I can finally leave the app playing in the background without worrying about my screen timing out, and I can navigate to other phone or tablet functions like email while still listening.

I originally used during work travel for listening to a net that I frequent back home. I quickly realized this app is great for listening to so much more.

5 stars all day long. Thank you!!
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It’s amazing!

As a pure novice to the ham & shortwave radio realm finding this app is like winning the lottery. So much to learn and explore. If the developer ever puts out a link to a YouTube tutorial I’d be even more thrilled.

Great SDR app!

Finally having the ability to listen to online servers like kiwi SDR in the background or even with screen off is wonderful. Thank you!

Listening to the World!

Since I started studying for my ham radio license a couple of years ago, I have learned to enjoy the world of SDR listening. But doing so via mobile browser has always proved to be complicated. The touch interface never felt quite calibrated right, and I often had to mess around with my sound settings.

But this app has bridged the gap between Web SDR and the iPhone. I like pulling it out just to listen for random ragged chews when I’m not in a position to transmit, or to see if I can pull in W1AW as I’m working to learn Morse code.

Keep up the good work!
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Might have found a new hobby

I have no idea what I’m doing but I’m having fun. Sure helps pass the time when you are home with health problems.

FAQ

What can I listen to with Echo?

Echo allows you to tune into a wide variety of radio signals from around the world. This includes international shortwave broadcasts, aviation communications, numbers stations, and distant FM stations, all accessible through community-hosted Software Defined Radio (SDR) receivers.

How does Echo's interactive map work?

The app features a global interactive map that uses a native clustering engine to visually display thousands of remote SDR servers worldwide. You can easily browse these receivers or instantly search for specific ones by name or location.

What SDR architectures does Echo support?

Echo offers unmatched SDR compatibility, seamlessly supporting KiwiSDR, OpenWebRX, WebSDR, and FM-DX architectures. You can also add your own unlisted servers with custom URL entry if needed.

Can I listen to Echo in the background?

Yes, Echo provides uninterrupted background audio. It features a custom audio bridge that intercepts complex SDR streams, allowing for true iOS background playback and lock-screen controls, even when your screen is locked or you are using other apps.

Does Echo have ads?

No, Echo is ad-free. The application is built with a privacy-first approach and does not include any advertisements.

Is Echo available on Android devices?

Echo is natively built for iOS devices. It is currently supported on iPhone and iPad.

How often is Echo updated?

Echo was last updated on March 31, 2026, with version 1.0. The app is designed for speed, aesthetics, and privacy, ensuring a premium listening experience.

What is the age rating for Echo?

Echo has an age rating of 4+. This indicates it is suitable for a wide audience and does not contain content inappropriate for younger users.