Signal Watcher
Environmental Anomaly Scanner
Only for iPhone
$4.99
iPhone
New: see sound beyond human hearing, catch ultrasonic bursts, track air-pressure shifts, and ask for names with a 15,000-word spirit box. Fully on-device and private.
Most ghost apps guess. Watcher measures.
Watcher turns your iPhone into a multi-sensor field instrument for paranormal investigation. It reads the microphone, magnetometer, motion sensors and barometer in real time, rules out the ordinary explanations first — electrical hum, machinery, chargers, doors, your own movement — and shows you what’s left.
SENSE WHAT YOU CAN’T
• Live spectrum — watch sound from deep bass up past the limit of human hearing
• Ultrasonic detection — catches tones and bursts above 18 kHz, and flags steady tones that are likely electronics
• Infrasound — low-frequency energy and its dominant frequency, including the 17–21 Hz range
• EMF — magnetic field shifts against a self-calibrating baseline
• Barometer — sudden air-pressure changes from doors, drafts and vents
• RNG field — statistical randomness tests on your device’s entropy source
RULE OUT THE ORDINARY
Watcher doesn’t shout “activity” at every noise. It recognizes 50/60 Hz electrical hum and mechanical sources, ignores readings while you’re moving the phone, recalibrates when you start charging, and learns each location’s normal baseline. Every reading shows what was explained away and what remains unexplained.
SPIRIT BOX
When the field goes unexplained, the channel opens and speaks:
• SCAN — a 15,000-word dictionary
• EVP — short call-and-response words, listening for a reply after each one
• NAMES — over 1,700 first names spanning 1880 to today, for asking “what is your name?”
Responses heard right after a word are marked so you can review them later.
DOCUMENT EVERYTHING
• Labeled sessions with a summary of peak readings and activity time
• Location tags with learned baselines for each place you investigate
• Full CSV export of sensor readings and every word, with timestamps
PRIVATE BY DESIGN
Everything happens on your iPhone. No account, no ads, no tracking, no network connection. Audio is analyzed in fractions of a second and never recorded or stored.
Grab your phone, set a location, and find out what’s really there.
Ratings & Reviews
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Hear what you can’t.
• Live spectrum display — see sound from deep bass up past the limit of human hearing
• Ultrasonic detection — catches tones and bursts above 18 kHz, and flags steady tones that are likely electronics
• Barometer channel — detects sudden air-pressure shifts from doors, drafts and vents, so ordinary causes get ruled out
• Spirit box: 15,000-word dictionary, plus a new NAMES mode for asking “what is your name?”
• Choose SCAN, EVP or NAMES mode at any time
• Mic recovers automatically after calls and Siri
• More accurate low-frequency detection, including 50/60 Hz electrical hum
• Faster processing — still 100% on-device, nothing ever leaves your phone
The developer, Jayron Martinez, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Jayron Martinez
- Size
- 2 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.6 or later.
- iPhone
Requires iOS 17.6 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Jay Martinez
