Visualize the Spectrum

See the invisible. Stream raw waterfall data directly from KiwiSDR, OpenWebRX, WebSDR, and FM-DX servers to explore the radio spectrum in real time on a fluid, hardware-accelerated canvas.

Listen to Anything, From Anywhere

Echo turns your iPhone and iPad into a global radio receiver. Browse 2,000+ KiwiSDR, OpenWebRX, WebSDR, and FM-DX servers to hear shortwave, aviation, numbers stations, and distant FM in real time.

Download on the App Store View on GitHub

As seen on RTL-SDR.com

First described as a "really cool looking app" (Jan '26), then recognized as being "designed to make it easy to search for and view public receivers on iOS" (Feb '26), RTL-SDR covered Echo's official launch on the App Store (Apr '26).

As seen on SWLing Post

Praised as a "very capable listening companion" that is "very stable for long listening sessions," Echo leverages its native iOS development to feature "full background audio for uninterrupted listening" (Apr '26).

Global Access

Browse thousands of community-hosted receivers on an interactive world map. Filter by server type and jump into any receiver in seconds.

Smart Scanner Mode

Turn any remote receiver into a hands-free band scanner. Cycle through saved frequencies and curated libraries to catch aviation, maritime, military, and other active signals.

Find Nearby Receivers

Sort the receiver network by distance to surface nearby stations first, then jump in to hear local aviation, repeater, emergency, and regional radio activity.

Dial In With Precision

Manually enter exact frequencies and switch between precise modulation modes to lock onto specific signals with confidence.

Built for Real Radio Listening

Maps, live waterfalls, scanning, logging, and signal tools designed for iPhone and iPad.

Global Map

Native MapKit-powered map to visually explore the worldwide receiver network. Filter by KiwiSDR, OpenWebRX, WebSDR, or FM-DX.

Live Waterfall Display

Render live spectrum data from supported servers on a smooth, hardware-accelerated waterfall, with native decode modes where available.

Scanner Mode

Automatically cycle through a list of stations or presets at a set interval — like a police scanner for the entire radio spectrum.

Live Signal Metrics

Real-time SNR sorting to instantly identify the strongest receivers in the network.

Offline Frequency Library

A searchable local database of 10,000+ global frequencies, available without an internet connection.

Station Logging

Integrated database for saving frequencies and station details.

Quick Presets

Optimized touch interface for instantly switching bands.

Background AudioPro Preview

Keep listening while your screen is locked or while you use other apps.

Coming Soon

Echo Pro

On-device transcription, translation, recording, and private sync for deeper listening workflows.

Smart Interpreter

Live speech-to-text transcription and real-time language translation, entirely on-device using Apple's frameworks.

Smart Recording

One-tap audio capture with automatic transcription and translation to document station content.

iCloud Sync

Optional cloud backup for favorites and settings via your personal encrypted iCloud container.

Privacy is Not Optional

Zero tracking. No analytics. No ads. No servers. All your data stays on your device. Echo doesn't know who you are, how you use it, or what you listen to.

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Stay Close to Echo

Get release updates, share catches, suggest features, and talk radio with other listeners.