SpectraBoxSpectraBox: the spirit box EVP app that runs entirely on your phone
Words appear on screen as the box speaks them, a live EMF meter reads your phone's real magnetometer, and every session is saved with a timestamped transcript you can export. No radio, no internet, no fakery. Works in airplane mode.
What is a spirit box?
A spirit box is a device that sweeps rapidly through sound fragments so that listeners can hear short words in the output. Ghost hunters treat those words as possible replies from spirits. There is no scientific evidence that they are, so SpectraBox treats it as a game. Read the full explainer.
How does SpectraBox work?
SpectraBox generates a swept noise bed live on your phone, then plays a short voice clip for each word as it appears on screen. Words come from a list built into the app, driven by a seed that is saved with every session, so the output is procedural and nothing is streamed. The EMF meter shows your phone's real magnetometer. How you can verify this yourself.
Is SpectraBox free?
Yes. SpectraBox is free to download, and the EMF meter, a one-minute spirit box session with words on screen, the session log and the Spirit voice stay free. SpectraBox Pro is an optional one-time purchase of $9.99 with no subscription. See what is free and what is Pro.
Features
Words on screen, in real time
Each word appears in a scrolling, timestamped transcript as the box speaks it, so you can read what it said instead of straining to hear it.
A voice for every word
An eerie spirit voice sounds out each word. It uses recorded clips bundled in the app (or your phone's offline voice for words you add yourself). One tap turns it off.
Live EMF meter
A 0 to 100 readout from your phone's real magnetometer. It jumps near electronics, speakers and metal. Free, with no time limit.
Spirit Lens camera
An SLS-style body-pose overlay on your camera, drawn on device, with confidence scores and honest labels. Detections are artifacts, not evidence. Live for one minute free.
Session log and export
Every session is a timestamped log you can play back. Pro exports CSV and text, with an audit block listing the seed and engine version.
Clip Studio
Turn a session into a shareable card (free) or a rendered video clip with words, EMF trace and audio (Pro).
EVP Analysis Lab (Pro)
Record the real sound of your room, then scrub, slow down, reverse and tag moments. Recordings stay on your device.
Case Files (Pro)
Group sessions, photos and notes into an investigation and export a PDF with the transcript and audit block.
Theme packs and custom words
Seven themed word banks (Halloween Night is free Oct 1 to Nov 2), plus Custom Word Banks, Voice Lab voice presets and a K2 five-light meter mode in Pro.
Your spirit tonight
Each session with words introduces a named character with an era, a temperament and a short story built from the session's words. It is a game, generated on your phone.
Private by design
No accounts, no analytics or advertising SDKs, and no server that receives your data. See the privacy policy.
Newest on iPhone (1.6.0)
Ask mode, a live sweep readout with a bank scan strip, Many voices for Pro, and a Spirit Lens depth view. Newest features reach iPhone first.
Screenshots
Honest by design
The category's biggest complaint is that spirit box apps feel fake, or quietly call a server. SpectraBox is built to be checked, not trusted.
- Airplane mode test. Switch to airplane mode and start a session. It works exactly the same.
- Procedural and seeded. The same seed gives the same word sequence, a new seed gives a new one. The seed is recorded in every export.
- Audit block. Exports end with "Generated procedurally on this device. No network. Not evidence of paranormal activity."
- Entertainment framing. SpectraBox never claims to detect real paranormal activity.
Pricing
| Plan | Price | What you get |
|---|---|---|
| SpectraBox (Free) | $0 | Full EMF meter, a one-minute spirit box session with words on screen, visible session log, Spirit voice, free share card, a one-minute live Spirit Lens preview, your spirit after each session, and the Halloween Night word bank (Oct 1 to Nov 2) and Dia de los Muertos bank (Oct 31 to Nov 2). |
| SpectraBox Pro | $9.99 one-time (USD) | Unlimited session length, recording and playback, CSV and text export, unlimited Spirit Lens with snapshot and clip capture, Overlay Evidence Camera, EVP Analysis Lab, Clip Studio video export, Case Files with PDF export, Spirit Gallery, seven theme packs, Custom Word Banks, K2 mode, Voice Lab, correlation view, red-light mode, calibration controls, background sessions and widget. iPhone also adds the Apple Watch companion and Live Activity. |
Pro is a single one-time purchase, not a subscription, and it is the same price on iPhone and Android. Your store shows the price in your currency. Purchases are handled by Apple or Google and do not transfer between the two stores. Restore Purchases is in the app.
Guides: spirit boxes, EVP and EMF explained
What is a spirit box?
Plain-English guide to spirit boxes: how the radio sweep idea works, where it came from, how apps recreate it, and why it is entertainment.
How EVP recording works
What electronic voice phenomena (EVP) are, how investigators record and review audio, the ordinary explanations for odd sounds, and how to keep an honest log.
Spirit box vs ghost box
Spirit box, ghost box, Frank's Box, radio sweep, EVP recorder and EMF meter compared. What each name means and which one you actually need.
How to run an EVP session
A calm, structured guide to a first EVP session with a spirit box app: preparation, questions, timing, logging and honest review.
How to choose a spirit box app
A fair, brand-neutral checklist for judging any spirit box app: offline behavior, honest framing, permissions, privacy, exports and pricing.
What is an EMF meter on a phone?
How a phone EMF meter uses the magnetometer, why the number jumps near electronics and metal, and what it can and cannot tell you.
Why spirit box words feel meaningful
The psychology behind spirit box "answers": auditory pareidolia, confirmation bias, priming and big word lists, plus how to run a fair session.
Are spirit box apps real?
Honest answer on spirit box apps: how they make sound, what streaming vs on-device means, how to test an app offline, and why it is entertainment.
Frequently asked questions
What is SpectraBox?
SpectraBox: Spirit Box EVP is an entertainment app for iPhone and Android with a spirit box that shows and speaks words in real time, a live EMF meter, a body-pose camera overlay called Spirit Lens, and timestamped session logs you can export. It is for entertainment only.
What is a spirit box?
A spirit box is a device that sweeps rapidly through sound fragments so that listeners can hear words in the output. Ghost hunters treat those words as possible replies, but there is no scientific evidence that they come from spirits. In SpectraBox it is a game that runs on your phone.
Does SpectraBox really contact spirits?
No. SpectraBox is for entertainment purposes only and does not detect, measure or contact anything paranormal. Its words come from a list built into the app, and nothing it produces is evidence of paranormal activity.
Is SpectraBox free?
Yes, SpectraBox is free to download. Free forever: the full EMF meter, a one-minute spirit box session with real-time words on screen, a visible session log, the Spirit voice, a free share card and a live Spirit Lens preview. SpectraBox Pro is an optional one-time purchase of $9.99 with no subscription.
Does SpectraBox work offline or in airplane mode?
Yes. The spirit box is generated on your phone: a noise sweep made live plus a voice clip for each word. There is no radio and no internet connection involved, so it works in airplane mode.
Does SpectraBox use a radio or stream audio from a server?
No. Nothing is streamed and no network is needed for a session. The words come from a list stored in the app, and every session records the seed that produced it.
What does SpectraBox Pro include?
Pro unlocks unlimited session length, recording and playback, CSV and text export, Spirit Lens capture, the Overlay Evidence Camera, the EVP Analysis Lab, Clip Studio video clips, Case Files with PDF export, seven theme packs, Custom Word Banks, Voice Lab, K2 meter mode, red-light mode and calibration controls. It is one payment with no subscription.
Which devices does SpectraBox run on?
SpectraBox is available for iPhone on the App Store and for Android phones on Google Play. The iPhone version also has an Apple Watch companion and a Live Activity. A purchase made on one store does not transfer to the other.
What permissions does SpectraBox need?
The core spirit box and EMF meter need no permission. The camera (Spirit Lens and Overlay Evidence Camera), microphone (EVP Analysis Lab), location (Case Files, one-shot reading) and notifications on Android (background sessions) are all optional and asked only when you use that feature.
Does SpectraBox collect my data?
SpectraBox has no accounts, no analytics or advertising SDKs, and no server that receives your data. Sessions, recordings and photos stay on your device. See the privacy policy for the Android-specific Google components.
How do I contact support?
Email spectrabox@bdsalesinc.ca. The support page also answers common questions about sound, the EMF meter and restoring purchases.
Get SpectraBox
Free on iPhone and Android. Try the airplane mode test and see for yourself.