crabSDR

Listen to ham radio live: 2 m, 70 cm, repeaters, APRS, FT8, SSTV, FreeDV and DAPNET via open crabSDR stations – no account, no ads.

crabSDR turns your iPhone and iPad into an amateur radio receiver. The app connects to crabSDR stations – WebSDR receivers run by radio amateurs on their own hardware – and plays what is on the air right now: repeaters on 2 m and 70 cm, SSB nets, FM calling, APRS, FT8, SSTV, FreeDV and DAPNET pager calls.

• Directory of all public stations on crabsdr.de, search by band, distance and location • Add your own stations: public address, home network (Bonjour) or QR code • Real-time waterfall and spectrum, tap and drag to tune, pinch to zoom • The station's modes: FM, AM, USB, LSB, CW, DATA and DV (FreeDV with RADE and Codec 2), with call sign display • Audio keeps playing in the background and with the screen locked, via Bluetooth, AirPlay and CarPlay audio; lock-screen controls, sleep timer, recording • Live decoders: APRS with map, FT8, SSTV images, FreeDV call signs, pager (POCSAG) • Quick tune, band plan ranges, repeater markers with system colors (FM, DMR, C4FM, D-Star, TETRA), memories synced via iCloud • Station chat with report and hide, network chat via crabsdr.de • Favorites widget, Live Activity in the Dynamic Island, Shortcuts ("Listen with crabSDR", "Stop crabSDR", "crabSDR sleep timer") • iPhone portrait and landscape, iPhone Duo folded, unfolded and half-folded as a tabletop radio, iPad with sidebar, keyboard shortcuts like the web UI, VoiceOver • Entirely in English or German, following your device's language

crabSDR is receive-only: no transmitting, no account, no ads, no tracking. The app collects nothing; what a station processes is up to its operator and shown in the app under "Info".

Running a receiver yourself? See crabsdr.de.