Comparison

Seismometer ∞ vs EMF Detector

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

Head to head
About

Seismometer ∞

Features
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Seismometer ∞ — earthquake detector, vibration meter, and seismograph in your pocket. Turn your iPhone into a precision seismometer and vibration meter. Detect tremors, monitor seismic waves, and visualize ground motion in real time. • Real-time seismograph visualization with precision charts • Track X, Y, Z axis vibration readings with detailed graphs • Monitor earthquake tremors and ground movement • Professional-grade sensitivity for reliable measurements • Clean, intuitive interface for easy data interpretation Perfect for earthquake awareness, physics experiments, scientific research, and education. Whether you're a researcher, student, or curious explorer, discover the hidden world of seismic activity. Privacy Policy: https://www.icloud.com/pages/0bcX7C5KVMC35FbMWk-FNfjWg Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

EMF Detector

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Four new tools join the meter in 1.1: Radar, Metal Finder, Presence Meter and SLS-Style Camera. Every number on screen comes from your iPhone's own sensors. The magnetometer reading is real. What it means is up to you. THE METER: EMF Detector reads your iPhone's magnetometer and shows the live magnetic field in µT or mG. Each start calibrates a baseline for the room and tells you how steady it was. Readings are classed Calm, Weak, Potential, High or Extreme. - Meter | Graph switch; live 30-second graph with X, Y and Z toggles - Sensitivity presets, haptic and beep feedback - Record Mode: a clean full-screen view for filming - Siri and Spotlight shortcut into the meter THE TOOLS TAB (all four free to open): - Radar: a live compass radar driven by the magnetometer. When the field reaches Potential or above, a blip appears in the direction your iPhone faces. - Metal Finder: shows how far the field moves from its baseline, with a threshold, beep and vibration. It responds to magnets and magnetic metals such as iron and steel, not to gold or aluminium. - Presence Meter: shows how much your iPhone itself moves, from its accelerometer. Set it down and it reacts to bumps and vibration. - SLS-Style Camera: a live rear-camera view. Apple's Vision framework looks for human body shapes on your iPhone and draws a stick figure only where it finds one. People, mannequins, photos and TVs can show figures; an empty room shows none. Your live EMF reading stays on screen. RECORDING: Tap Record and walk the space; each spike is marked as it happens. Tap Stop for the timeline, spikes, baseline and peaks. Compare any two sessions side by side. FREE AND PRO: Free: the meter, graph, Record Mode, recording (3 most recent sessions kept), session detail, compare and all four tools. Pro adds: no ads; unlimited history; CSV export; radar skins (colour themes: Thermal, Night Vision, Vintage); Presence Meter recording, sensitivity and sound alert; SLS-Style Camera extras: Depth (LiDAR) on iPhones with LiDAR, a night-vision-style filter and photo capture. Without Pro, a rewarded ad unlocks one session's export while its screen stays open, or a time-limited trial of the Pro tool extras. The trial does not remove ads or unlock history or export. SUBSCRIPTIONS: EMF Detector Pro: Weekly $2.99 (3-day free trial), Monthly $4.99 (3-day free trial), or Lifetime $24.99, a one-time purchase. Prices are in US dollars; the App Store shows your local price. Free trials are for eligible new subscribers. Payment is charged to your Apple Account. Subscriptions renew automatically until cancelled. To cancel: Settings > your name > Subscriptions > EMF Detector Pro > Cancel Subscription. To avoid renewal after a free trial, cancel at least 24 hours before it ends. ADS: Free users see Google AdMob ads: a native card labelled "Ad" on the meter and tool screens, and occasional full-screen ads after you stop a recording, when you leave a tool, and when you go back from a saved session, a comparison or the instructions. No ads appear on their own in Record Mode or while recording. ENTERTAINMENT NOTICE: The magnetometer reading is real. What it means is up to you. Magnetic fields change near wiring, appliances, magnets, metal and other phones, and this app cannot tell those apart from anything else. It is made for paranormal-style entertainment and does not claim that a change in the field means a ghost is present. PRIVACY: No account. The camera works only in the SLS-Style Camera tool; images are processed on your iPhone and nothing is stored or sent unless you share or save a photo. Sharing usage data (Google Analytics for Firebase) is your choice, changeable in Settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://ashaquavision.com/privacy-policy/emf-detector-ios/ iPhone only. Requires a device with a magnetometer.

Screenshots

Seismometer ∞2 screens
EMF Detector4 screens

Verdict

The call

The clearest difference is in-app purchases: Seismometer ∞ at none against EMF Detector's 1. On price, update cadence, ads and device support there is nothing between them.

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. EMF Detector sells 1 one-off in-app purchase. Seismometer ∞ asks for nothing beyond the download.

UpkeepUpdate frequency

Seismometer ∞ ships an update every 2 weeks, EMF Detector every 3 weeks. The most recent releases landed on October 24, 2026 and October 26, 2026 respectively.

Scorecard1 real difference · 5 level
Seismometer ∞ versus EMF Detector: the parameters behind the verdict, then further details
ParameterSeismometer ∞EMF Detector
PriceFreeFree
Update frequencyEvery 2 weeks — betterEvery 3 weeks
AdsYesYes
In-app purchasesNo — betterYes
DevicesiPhoneiPhone
Requires iOS17.017.0
Further details — not scored
Size16 MB25 MB
Age rating4+9+
Developer辰巳家有限公司Ashir Mehmood

In-app purchases

None

Seismometer ∞

No in-app purchases

1 purchases

EMF Detector

One-time1
  • EMF Detector Pro$4.99

Questions

Is Seismometer ∞ free?
Seismometer ∞ is free to download, with no in-app purchases.
Is EMF Detector free?
EMF Detector is free to download, with in-app purchases available.
Do Seismometer ∞ or EMF Detector have ads?
Both Seismometer ∞ and EMF Detector show ads.
Which is updated more often, Seismometer ∞ or EMF Detector?
Seismometer ∞ ships an update every 2 weeks, and EMF Detector every 3 weeks. Most recently, Seismometer ∞ was updated on October 24, 2026 and EMF Detector on October 26, 2026.

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