Comparison

Threshold vs SpiritTrace

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Threshold

Read full description

Threshold is a paranormal investigation command center for capturing, monitoring, organizing, and reviewing field evidence in one place. Use Spirit Box Lab, record EVP audio, capture custom video, monitor magnetic fields, motion, vibration, and audio levels, take photos, and keep everything connected by Session and Area. Create a Session for each investigation and preserve audio, video, photos, motion events, markers, notes, magnetic context, and Spirit Box Lab runs for later review. SPIRIT BOX LAB Spirit Box Lab uses calibrated live magnetic-field and device-motion activity to generate indexed word outputs from a curated 2,048-entry production vocabulary. Outputs are driven by live sensor activity rather than released through a simple repeating word timer. Choose a Session, Area, sensitivity, and spoken-output setting before beginning a run. Generated outputs, timing, contributing sensor activity, and Trigger Details are saved for later review and interpretation. Free users receive 15 minutes of complimentary Spirit Box Lab monitoring time, with up to 5 minutes per run. Upgrade to Threshold Pro for unlimited Spirit Box Lab access. CAPTURE INVESTIGATION EVIDENCE • Record EVP audio • Capture video with Threshold’s custom camera interface • Use pinch zoom, precision zoom, and torch controls • Take rapid investigation photos • Monitor a fixed camera scene for motion-triggered events • Import supported audio, video, and photos • Save evidence directly to a Session and Area MAGNETIC CONTEXT On supported devices, Threshold can preserve magnetic activity alongside captured evidence. • EVP audio and video can include synchronized magnetic timelines • Photos and Motion Camera images can include capture-time magnetic snapshots • Review readings, baselines, changes, activity levels, and timestamps • Add markers from a selected magnetic timeline moment Rotating the device briefly recalibrates magnetic sensing. Threshold may display CALIBRATING before live readings resume. If magnetic sensing is unavailable, capture and review continue normally without magnetic context. LIVE INVESTIGATION TOOLS Magnetic Field Monitor View live magnetic-field readings, baseline changes, peak activity, and individual axis values. Motion Camera Monitor a fixed scene and capture images when visual movement is detected. Vibration Beacon Monitor device movement and surface vibration with adjustable sensitivity. Audio Level Meter Watch relative sound-level changes through a responsive live display. REVIEW IMPORTANT MOMENTS • Review audio with detailed waveform timelines • Review synchronized magnetic activity when available • Replay key moments • Add timestamped markers and notes • Review saved videos, photos, and motion events • Review magnetic snapshots saved with supported images • Review saved Spirit Box Lab runs and Trigger Details • Move evidence between Sessions and Areas ORGANIZED BY SESSION AND AREA Threshold keeps investigation evidence connected to its context. Use Sessions for separate investigations and Areas for rooms, zones, or locations within each Session. Evidence can also remain Unassigned and be reorganized later. SESSION EXPORT Threshold Pro can export a structured Session package containing investigation details, evidence files, markers, Motion Camera metadata, Spirit Box run data, magnetic timelines, and magnetic snapshots. THRESHOLD PRO Upgrade once for lifetime access to: • Unlimited Sessions • Unlimited Areas • Unlimited saved evidence • Unlimited markers • Unlimited Spirit Box Lab access • Session export Threshold Pro is a one-time in-app purchase. No subscription is required. PRIVACY-FOCUSED Threshold does not require an account. Core investigation data is stored locally on your device, and you control what you export or share. Threshold is designed for iPhone.

About

SpiritTrace

This app uses your iPhone's magnetometer to detect and display magnetic field changes in real-time. Explore different visual outputs, capture evidence clips, and enhance your paranormal investigations with optional audio and haptic feedback.

Highlights
  • Real-time magnetic field detection
  • Four sensor-driven display modes
  • 15-second evidence clip export
  • Geiger-style audio feedback
  • Haptic feedback intensification
  • Built for paranormal experiments
Read full description

Measure real magnetic-field changes with SpiritTrace, a paranormal EMF instrument powered by your iPhone’s built-in magnetometer. REAL SENSOR. NO SCRIPTED SPIKES. The meter reacts to genuine magnetic-field readings from the same sensor used by your phone’s compass. Bring it near speakers, wiring, motors, magnets, metal, and electronics to see the field respond in real time. FOUR SENSOR-DRIVEN DISPLAYS Switch between Analog, Digital, 5-Bar, and Dual displays. Every face uses the same live sensor data. CAPTURE THE MOMENT Export the previous 15 seconds as a shareable evidence clip with readings, peak level, graph, and timestamp. FEEL EVERY CHANGE Optional Geiger-style audio and haptic feedback intensify with the field, so you can investigate without watching continuously. BUILT FOR PARANORMAL EXPERIMENTS Use SpiritTrace for ghost-hunting atmosphere, field experiments, and exploring how everyday objects affect the magnetometer. IMPORTANT SpiritTrace measures magnetic-field strength. It cannot verify paranormal activity or identify hazardous electromagnetic radiation. It does not replace professional safety equipment. Paranormal interpretation is for entertainment. SUBSCRIPTION The complete app requires an active subscription or introductory trial. Eligible new yearly subscribers receive three days free. The monthly plan has no trial. Your localized price and terms appear before purchase. Subscriptions renew automatically unless canceled at least 24 hours before renewal. Manage or cancel in your Apple Account settings. Terms of Use: https://617sw.com/emf/terms Apple Standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://617sw.com/emf/privacy Support: https://617sw.com/emf/support

Screenshots

Threshold4 screens
SpiritTrace4 screens

Verdict

The call

Threshold and SpiritTrace are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Threshold sells 1 one-off in-app purchase and SpiritTrace sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

ScorecardNo meaningful differences
Threshold versus SpiritTrace: the parameters behind the verdict, then further details
ParameterThresholdSpiritTrace
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyWeekly—
AdsNoNo
In-app purchasesYesYes
Monetization—Subscription
DevicesiPhoneiPhone
Requires iOS17.617.0 — better
Further details — not scored
Size8 MB16 MB
Age rating9+4+
DeveloperBrandon Romero617SW, LLC

In-app purchases

1 purchases

Threshold

One-time1
  • Threshold Pro Lifetime$14.99
2 purchases

SpiritTrace

Subscriptions2
  • SpiritTrace EMF Pro Monthly$3.991 Month
  • SpiritTrace EMF Pro Yearly3 Days trial$19.991 Year

Questions

Is Threshold free?
Threshold is free to download, with in-app purchases available.
Is SpiritTrace free?
SpiritTrace is free to download, with in-app purchases available.
Do Threshold or SpiritTrace have ads?
Neither Threshold nor SpiritTrace shows ads.

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