SimpleSSTV
No in-app products collected for this app.
| Rating | |||
|---|---|---|---|
| China | 19%4 | 5.00 | |
| United States | 14%3 | 3.67 | |
| Germany | 14%3 | 4.67 | |
| Brazil | 10%2 | 3.00 | |
| Poland | 10%2 | 3.00 | |
| United Kingdom | 10%2 | 3.00 | |
| Netherlands | 5%1 | 5.00 | |
| Mexico | 5%1 | 5.00 | |
| Japan | 5%1 | 5.00 | |
| Croatia | 5%1 | 5.00 | |
| Canada | 5%1 | 5.00 |
Description
SimpleSSTV is a native iOS app for encoding, decoding, and live-transmitting slow-scan television (SSTV) signals — the method ham radio operators use to share images over audio frequencies.
Slow-scan television converts images to audio tones. Each pixel's brightness becomes a specific frequency between 1500-2300 Hz. Sync pulses at 1200 Hz mark line boundaries. The result is an audio signal you can transmit over any voice-capable radio, or record for later playback.
SSTV has been used by amateur radio operators since the 1950s. It's still actively used today on HF bands, VHF repeaters, and for receiving images from the International Space Station.
ENCODING (Image → Audio)
Load any image from your photo library, camera, or Files
Automatic resize and crop to SSTV resolution
14 supported modes covering all major SSTV formats
Real-time encoding with progress visualization
Play audio directly through speakers for VOX-triggered transmission
Export to WAV or M4A for later use
Optional FSK ID and CW ID (Morse code) callsign transmission
Test pattern generator for signal testing
DECODING (Audio → Image)
Load WAV, M4A, or MP3 audio files containing SSTV signals
Live microphone capture for real-time SSTV reception
Automatic mode detection via VIS code identification
Precision audio trimming with dual-view waveform editor
Re-decode saved images with different mode, sync offset, or slant correction
Handles real-world signal imperfections: timing drift, noise, sample rate variations
Optional decode watermark stamps mode, timestamp, and callsign on received images
Waterfall spectrogram display shows signal frequency over time
Note: It's super important to get a clean audio signal into the decoder. There's a new help section in settings with audio setup advice, USB adapter recommendations, and decode troubleshooting.
LIVE CAMERA MODE
Real-time camera feed with front/back camera switching
Three trigger modes: Continuous, Motion-triggered, or Periodic interval
SUPPORTED MODES (14 total)
Martin M1 (114s), Martin M2 (58s)
Scottie S1 (110s), Scottie S2 (71s), Scottie DX (269s)
Robot 36 (36s), Robot 72 (72s
PD50, PD90, PD120, PD160, PD180, PD240, PD290
ISS SSTV EVENTS
Get notified when the International Space Station transmits SSTV images
Automatic alerts before and during events, with frequency, mode, and callsign info
Info card on the decode tab with event details and countdown
FAQ & SETUP TIPS
Practical advice on audio setup and USB adapters
Decode quality troubleshooting
Quick reference for all 14 SSTV modes
IMAGE LIBRARY
Automatic saving of encoded and decoded images
Grid view with full preview, metadata, and sharing
Re-decode any saved image with different settings
Filter by encoded or decoded
10 LANGUAGES
Available in Arabic, Chinese (Simplified), Dutch, English, French, German, Polish, Portuguese (BR), Spanish, and Turkish — with full right-to-left support.
PRIVACY
No accounts, no analytics, no tracking. Your images and audio stay on your device. Buy once, use forever. We do not use, sell or share your data for advertising or marketing purposes.
Be aware: Encoded images are audio signals, meaning anyone receiving the audio can decode them!
REQUIREMENTS
iOS 18 or later
Camera access for live mode
Microphone access for live decode
This simple, no nonsense utility was built by a ham radio operator for ham radio operators. 73!