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Echo: Global SDR Receiver

Echo: Global SDR Receiver

SDR Tuner, Shortwave & Scanner

36 ratings
20 reviews
🔧 Utilities
🔍 Reference
Free
In-App Purchases

Details

Released
March 31, 2026
Updated
October 17, 2026

Features

Developer

Mark Garrison Jr.
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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

1.5.3

October 17, 2026

Echo 1.5 introduces Echo Pro, along with new ways to capture, understand, and revisit the airwaves. • Record live radio and build your own recording library • Transcribe live broadcasts on device as you listen • Translate supported transcriptions into English • Sync recordings, transcripts, translations, notes, favorites, saved servers, and supported settings across your Apple devices with iCloud • Access and play your synced recordings across devices • Improved accessibility and VoiceOver support throughout Echo New in 1.5.3: • Support for iPhone Duo • Receivers stay available even if the receiver directory can't be reached • More reliable directory recovery after an interrupted or failed refresh • Improved VoiceOver, Dynamic Type, and Reduce Motion support, with larger touch targets in the recording player • Simplified Global Database categories • Additional fixes, refinements, and performance improvements Everything you already use Echo for remains free. Listening, tuning, the global map, scanning, frequency search, and connecting to supported servers do not require an Echo Pro subscription. Echo Pro features require a monthly or annual subscription.

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Subscriptions & In-App Purchases

Echo Pro Monthly

Full Echo Pro access, billed monthly.

$4.991 Month
How to cancel Echo subscription ⁉️

User reviews

Most RecentHighest RatedLowest Rated

Looks great!

I was able to find my favorite WebSDR with this app. I only can’t really hear anything. Probably a setting.
OOskovian

Outstanding app

Great for listening to all sorts of HF transmissions. Very fun and easy to navigate and use. Thank you…highly recommended!
JJohnB978

Thank you!

Thank you so much, Mark! I haven’t been able to find a place for my rig in over 25 years. This has given me the push that I need to get it going again. In the meantime, I’ll be using Echo!
WOWfields in OK

Excellent tool for listening!

When I was first studying for my ham radio license a couple years ago, I discovered the joy of Web SDR and all that it allowed me to listen to and learn from. In many ways, it is very similar to scanning through a short wave radio, and pulling up stations from around the world.

But the web application struggled on mobile browsers, and it was always a bit of a ramshackle experience.

Echo has found a way to make this tool available, user-friendly, and dead simple for iPhone users. It is greatly increased my enjoyment of listening in, and meant I don’t have to be at my laptop to really get the full experience. Thank you so much! Keep up the good work!
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Ppsyberduck

Thank-you!

Thank-you for creating! Amazing. Can’t wait for further updates. Expanded favorites functionality would be nice.
KKatotonica
See 15 more reviews

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.