PhosphorPSK

PSK31 / 63 / 125 decoder

Only for iPhone

$0.99 · Designed for iPhone. Not verified for macOS.

Also Included In

iPhone

Decode PSK31, 63 and 125 from your radio's audio in real time. Waterfall, vector scope and carrier tracking on a phosphor CRT. No cloud, no dependencies. PhosphorPSK turns your iPhone into a real-time PSK31 decoder with the look of a Cold War signals terminal. Hold it to your radio's speaker, or patch the audio in, and watch the text appear on a glowing phosphor screen — amber or green, your choice, scanlines and all. PSK31 is the mode that put keyboard-to-keyboard chat on the HF bands in a bandwidth barely wider than the signal itself. PhosphorPSK decodes it, and its faster cousins PSK63 and PSK125, straight from the received audio. No cloud, no account, no dependencies. Everything runs on the device. DECODING - Real-time BPSK demodulation: PSK31, PSK63, PSK125 - Locks onto the strongest signal in the passband — isolate the one you want by tuning your radio, the way you always would - Canonical Varicode, decoded exactly - Holds up well down to low signal-to-noise ratios SIGNAL DISPLAY - Live FFT spectrum with carrier cursor - Scrolling waterfall - BPSK vector scope — watch the constellation snap into place as it locks - Carrier, SNR, level and lock readouts BUILT FOR THE HOBBYIST - Session log: every decode saved, searchable, shareable - Adjustable input gain - Automatic strongest-signal lock, or set the carrier by hand - Amber and green phosphor themes, CRT glow and scanlines - iPhone, portrait, one clean screen PhosphorPSK is receive-only — a listening and decoding tool for shortwave listeners, amateur radio operators, and anyone who likes watching text pulled out of the noise. No transmit, no licence required to listen. Part of the Phosphor family of receive-only decoders, alongside PhosphorRTTY (radioteletype), PhosphorCW (Morse) and PhosphorSSTV (slow-scan images). Same CRT phosphor, different mode. On a busy band, narrow in with your radio — PhosphorPSK reads whichever signal is loudest. Tune to a PSK31 signal, point your phone at the speaker, and read the bands.

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The developer, Stuart Woolley, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

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    Information

    Seller
    • Stuart Woolley
    Size
    • 2.4 MB
    Category
    • Utilities
    Compatibility
    Requires iOS 26.5 or later.
    • iPhone
      Requires iOS 26.5 or later.
    • Mac
      Requires macOS 26.5 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 26.5 or later.
    Languages
    • English
    Age Rating
    4+
    Copyright
    • © 2026 Stuart Woolley
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.

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