Decode Slow Scan Television (SSTV) signals in real time using your iPhone's microphone. This app transforms audio tones into images, recreating the retro aesthetic of vintage monitors. It supports ten SSTV modes and offers advanced signal analysis tools.
1.1
August 11, 2026
Fixed decoder timing issue on newer hardware devices.
PhosphorSSTV is a utility app that decodes Slow Scan Television (SSTV) signals in real time using your iPhone's microphone. It transforms audio tones into images, offering an authentic retro CRT display aesthetic.
You hold your iPhone near a shortwave radio tuned to an SSTV signal or play an audio recording. The app processes the audio through your microphone to decode and display the image.
PhosphorSSTV supports ten SSTV modes, including Scottie (S1, S2, DX), Martin (M1, M2), and various Robot modes (36, 72, 8, 12, 24 BW).
No, PhosphorSSTV does not require an internet connection, external hardware, or an account. It operates solely on your iPhone.
PhosphorSSTV is a paid application, priced at $0.99.
No, PhosphorSSTV is ad-free. The app's privacy policy states that it makes zero network requests and contains no ads.
PhosphorSSTV is currently supported on iPhone devices.
The latest version of PhosphorSSTV is 1.1, which was last updated on August 11, 2026. Updates typically address bug fixes and feature enhancements.
