kSDR — an app for working with popular SDR receivers.
It enables reception and exploration of radio signals for amateur and educational purposes.

Currently supports the following popular USB SDR devices: RTL-SDR, HackRF, SDRplay (RSP), and others. Works directly via USB OTG.

Features:
- Receive radio signals with spectrum and waterfall display
- Supports AM and SSB (LSB/USB) demodulation
- Frequency memory presets
- Adjustable gain and bandwidth settings
- Low-latency audio output (<200 ms)
- Transmit radio signals using your device’s microphone (HackRF only).
With HackRF One, you can not only listen but also transmit — simply choose a frequency and modulation, and start broadcasting directly from your phone!
- And more.

Requirements:
USB OTG support on your Android device
A compatible SDR device (e.g., RTL2832U, HackRF One, RSP1/2, or msi2500-compatible device)

⚠️ Note: Core features of the app require a connected SDR device to function properly.

A 5-day free trial is provided so you can evaluate the app before purchasing the full version.