EVP Ghost Signal

EVP Ghost Signal is a professional-grade paranormal audio investigation tool. Record, analyze, and export EVP (Electronic Voice Phenomenon) sessions with real-time detection, spectrogram visualization, and EMF monitoring.

INVESTIGATION RECORDING
- High-quality audio recording with adjustable gain (up to +40 dB)
- Noise reduction and band-pass filter (300-3000 Hz voice range)
- Swipe between Waveform, Spectrogram, and EMF views while recording
- Tone generator (white noise, pink noise, frequency sweep) with adjustable volume
- Bookmark key moments during recording

REAL-TIME DETECTION
- Anomaly detection flags frequency spikes exceeding 3 standard deviations
- Whisper, voice, and breath pattern detection via formant analysis
- Live detection counters and alert banners during recording
- All events saved with timestamps for later review

SPECTROGRAM ANALYSIS
- Real-time frequency visualization with 5 color themes
- Orange crosshair markers on anomaly events
- Immersive full-screen mode
- Ghost Green, Phantom Blue, Infrared, Ultraviolet, and Classic Amber themes

EMF METER (Pro)
- Magnetic field measurement in microtesla using device magnetometer
- Full-circle gauge with color-coded levels (Normal to Extreme)
- Live history graph with spike markers
- EMF data saved with recordings and included in exports

PLAYBACK & EDITING (Pro)
- Reverse audio playback with speed control (0.5x-2x)
- Tap-to-seek waveform navigation
- Waveform trim tool — trimmed clips inherit all metadata
- 5-band parametric EQ with presets: EVP Enhance, Whisper Boost, Noise Cut, Voice Isolate
- Detection timeline with filterable list and tap-to-jump
- Timestamp bookmarks with red flash confirmation
- On-device audio transcription

EXPORT TOOLS (Pro)
- HD investigation video (1080x1920 @ 30fps) with animated spectrogram, waveform, EMF meters, detection flash, and timeline markers
- Filtered audio export with applied EQ and filters
- Multi-page PDF session reports with detection event logs
- Multi-session investigation log PDF
- Save videos to Camera Roll

ADDITIONAL FEATURES
- Spirit Box frequency sweep simulator (Forward, Reverse, Random)
- Session geolocation tagging with place names
- Session map with color-coded pins
- Investigation library with search and favorites
- 5 color themes throughout the app
- Contextual tips and How to Use guide
- Onboarding walkthrough

PRIVACY & ON-DEVICE PROCESSING
- 100% on-device — no data is ever sent to external servers
- No third-party SDKs, no analytics, no tracking
- All recordings, detections, EMF data, and bookmarks stored locally on your device
- Audio transcription runs entirely on-device using Apple Speech
- Signal processing (FFT, anomaly detection, whisper detection) all performed locally
- Location data stored only on your device and never shared
- No account or login required
- You own your data — delete a recording and it's gone forever

EVP Ghost Signal is designed for serious paranormal investigators, ghost hunters, and anyone curious about EVP research. The app uses scientific signal processing techniques — no gimmicks. Your privacy is respected: everything stays on your device.

Note: This app is for entertainment and research purposes. Anomaly and whisper detections are based on signal processing algorithms and do not guarantee the presence of paranormal phenomena.


Privacy Policy: https://sylvainlafrance.dev/evp-ghost-signal/#privacy-policy
Terms of use: https://sylvainlafrance.dev/evp-ghost-signal/#terms-of-use