SDR Pro: Radio Signal Analyzer

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About this app

SDR Pro turns your Android phone or tablet into a professional-grade radio spectrum analyzer — no expensive hardware required. Plug in any RTL-SDR dongle via USB OTG and watch the wireless world come alive in real time.

═══ SEE EVERYTHING ═══

A buttery-smooth 60 fps waterfall display lets you watch signals scroll by as they happen. The live FFT spectrum shows you signal strength across the full tuning range at a glance. Touch the waterfall to tune — drag left or right to move frequency, pinch to zoom. No menus, no typing. Just point and listen.

═══ LISTEN ═══

AM, FM, and USB/LSB demodulation pipe audio directly through your device speaker or headphones. A built-in squelch control silences dead air so you only hear what matters. Real-time audio, synchronized to the spectrum — hear the signal the moment you see it.

═══ RECORD & REPLAY ═══

Capture raw IQ recordings to your device storage in standard IQ16-LE format — compatible with GNU Radio, HDSDR, and SigDigger straight out of the box. No conversion, no proprietary formats. Replay recordings on your phone as if they were live: the waterfall, spectrum, and demodulator all work exactly as they would with a real antenna. Rename, export, and share recordings with a tap.

═══ BUILT FOR LARGE SCREENS ═══

SDR Pro is optimized for foldables and tablets. The waterfall and spectrum expand to fill every pixel of your display — no letterboxing, no wasted space. Use your fold as a desk display and see more spectrum detail than any phone-sized view can offer.

═══ WHO IT'S FOR ═══

🔭 Ham radio operators — monitor repeaters, visualize bands, log activity
🔐 Cybersecurity researchers — inspect RF emissions, replay captures for analysis, decode protocols
📡 RF enthusiasts & makers — explore ADS-B aircraft, weather satellites, trunked radio, NOAA imagery, and anything else the air carries
🎓 Students & educators — the waterfall makes abstract radio concepts immediately visual and tangible

═══ HARDWARE REQUIREMENTS ═══

• Any Android device running Android 8.0 (Oreo) or later
• A USB OTG adapter or USB-C hub
• Any RTL-SDR dongle (RTL2832U + R820T chipset — RTL-SDR Blog V3/V4, NooElec, and compatible clones all work)

No root required. No cloud account. No subscription.

═══ PRIVACY ═══

SDR Pro does not collect, transmit, or sell any personal data. Recordings are stored exclusively on your device. No analytics, no ads, no tracking.

Tune in. The spectrum is waiting.

What’s new

First release of SDR Pro! 🎉

• Live 60 fps waterfall + FFT spectrum display
• AM, FM, USB, LSB, Digital demodulation with squelch
• Touch to tune — drag to move frequency, pinch to zoom
• Snap-to-grid frequency landing + bookmarks
• IQ16-LE recording to device storage
• Replay recordings with pause/resume transport controls
• Export recordings to GNU Radio, HDSDR & SigDigger
• Optimized for foldables and large screens