Echo: Global SDR Receiver

SDR Tuner, Shortwave & Scanner

Free · Designed for iPad

Listen to anything, from anywhere. Connect to over 2,000 remote SDR receivers and OpenMHz archives for global 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. As featured on RTL-SDR.com: "Designed to make it easy to search for and view public receivers on iOS." 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 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. • Live Signal Metrics: Real-time SNR (Signal-to-Noise) sorting instantly identifies the strongest receivers in your list. Offline Frequency Library & Logging Search an offline, built-in EIBI database of over 11,000 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 securely stored locally or in your personal, encrypted iCloud container. 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

  • 5.0
    out of 5
    13 Ratings

What’s new in 1.1.0 VoiceOver & Accessibility Support This update adds VoiceOver support across Echo, so blind and low-vision users can tune frequencies, scan bands, and explore the global server map. • 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 Bug Fixes & Improvements • Solar Signal Indicator Fixed: The signal conditions pill in the player header was not appearing due to a change in NOAA's solar data format. It's back and working as expected. • Monitor Mode Fix: Resolved an issue where the screen could still auto-lock while actively listening with Monitor Mode enabled. • Improved formatting of links in Onboarding and Settings screens. • Improved List Management: You can now tap-and-hold on any saved server or frequency in the Favorites and Stations tabs to delete. Also added "Clear All" options to easily wipe your recent station history when needed from Station tab.

Version 1.1.0

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, for example, based 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 Color Alone

      • Sufficient Contrast

      • Reduced Motion

    Information

    Seller
    • Mark Garrison Jr.
    Size
    • 8.2 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.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    • English
    Age Rating
    4+
    Copyright
    • © Mark Garrison Jr.
  • Developer Website
  • Privacy Policy