Radio World's reviewer called Echo an app he has "loved using." Connect to 2,000+ remote SDR receivers for shortwave, ham radio, and public safety monitoring.
Echo is the ultimate, natively-built iOS client for tuning into remote radio servers. Listen to anything, from anywhere. Dive into international shortwave broadcasts from Asia, monitor aviation communications over the Atlantic, discover mysterious numbers stations, or tune into distant FM stations across the globe, all from your iPhone or iPad.
Featured in Radio World, on RTL-SDR.com, and in the SWLing Post. Radio World's Nick Langan praised Echo's "thoughtfully designed interface" and called it an app he has "loved using."
Designed for radio enthusiasts and curious listeners alike, Echo is a powerful aggregator that connects you to over 2,000 community-hosted Software Defined Radio (SDR) receivers and OpenMHz archives. By integrating these reliable streams into a dedicated native environment, Echo delivers true background audio, high-performance mapping, and premium features impossible to achieve with a standard web browser.
KEY FEATURES
Global Interactive Map & Search
Visually browse thousands of remote SDR servers worldwide using our smooth, native MapKit clustering engine, or instantly search 2,000+ receivers by name or location.
Unmatched SDR Compatibility
Seamless support for KiwiSDR, OpenWebRX, WebSDR, and FM-DX Webserver architectures. Want to listen to a private node? Add your own unlisted servers with custom URL entry.
Scanner Mode & OpenMHz
Automatically cycle through station lists at set intervals. Listen directly to public safety, fire, and EMS radio systems via vast OpenMHz archives.
Pro-Level Tuning & Analytics
• Smart Manual Tuner: Instantly tune by entering kHz or MHz; Echo intelligently detects the band format.
• Audio Engine Passthrough: Interfaces directly with server-side signal processors for 100% compatibility with waterfall rendering, plugins, and decoding extensions.
• Intelligent Profile Switching: Automatically switches to the correct server band profile as you tune on supported networks.
Offline Frequency Library & Logging
Search an offline, built-in EIBI database of over 9,000 global shortwave and utility frequencies. Save and log your favorite stations to your local device.
Uninterrupted Background Audio
Keep listening when your screen is locked or while using other apps. Our custom audio bridge intercepts complex SDR streams to provide true iOS background playback and lock-screen controls.
Privacy First
Zero tracking. No analytics, no proprietary servers, and no ad IDs. All your logs and favorites are stored locally on your device.
Built with speed, aesthetics, and privacy in mind, Echo ensures a fast, premium listening experience. Start exploring the airwaves today!
VoiceOver & Accessibility Support
• Every button, control, and station card announces meaningful context to VoiceOver
• Scanner controls (play/pause/skip/favorite) are fully labeled and navigable
• Station changes, server connections, and scanner state are announced in real-time
• Reduce Transparency support: glass effects swap to solid backgrounds when enabled
• Reduce Motion support: animations are simplified when enabled in iOS settings
• Decorative elements hidden from assistive technology for a cleaner navigation experience
Ratings & Reviews
This app has not received enough ratings or reviews to display an overview.
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.
Version 1.2
The developer, Mark Garrison Jr., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Privacy practices may vary based, for example, on the features you use or your age. Learn More
The developer indicated that this app supports the following accessibility features. Learn More
Supported Features
VoiceOver
Voice Control
Dark Interface
Differentiate Without Colour Alone
Sufficient Contrast
Reduced Motion
Information
Provider
Mark Garrison Jr.
Size
7.3 MB
Category
Utilities
Compatibility
Requires iOS 17.0 or later.
iPhone Requires iOS 17.0 or later.
iPad Requires iPadOS 17.0 or later.
Mac Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.