Comparison

EMF Detector vs APN切替ナビ

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

Head to head
About

EMF Detector

This utility app transforms your iPhone's magnetometer into an electromagnetic field scanner. It offers three distinct modes for safety, general readings, and paranormal investigation, with features like measurement history and comparison.

Highlights
  • Magnetometer-based EMF scanning
  • Auto, Safety, and Paranormal modes
  • Measurement history with trend charts
  • Notes and favorites for readings
  • Compare saved readings
  • Calibration offset
  • Share readings as image or CSV
Features
Read full description

EMF Detector reads your phone's magnetometer and shows the magnetic field around you in µT or mG: on a live gauge, as separate X, Y and Z axes, and over the last 24 hours. START IN ONE TAP Tap the gauge, or the green START button under it. The app first separates the phone's own magnetism from the field around you. While it says "Calibrating…", turn the phone slowly in a figure-8 for a few seconds; the live reading then appears and stays steadier while you tilt the phone. A short vibration confirms every start and stop. TWO WAYS TO MEASURE • Standard: a radial gauge with plain-language levels from "No EMF detected" upward. In Settings you can switch it to a Safety view that labels a reading as background, weak field, wiring detected or live wire (an estimate from field strength, not proof of a wire) and sets it against ICNIRP reference levels for the general public or for workers. • Paranormal: records a quiet baseline first, then rates each spike against it on a five-step scale and marks it on a session timeline. FIND THE SOURCE The Source tab turns the reading into a warmer / colder hunt. Move the phone slowly around the room; the indicator shows whether the reading is rising or falling, and the X/Y/Z bars show the sensor's value on each axis. KEEP A RECORD • Measurement sessions are saved with their minimum, average and maximum • A 7-day trend with insights, such as how a reading compares with your usual level • Notes and favorites for each reading, plus a side-by-side compare view • CSV export of your history, and share-as-image for the current reading • A 24-hour exposure chart on the main screen • Peak hold, and "Zero here" to re-learn the baseline in a new spot • Calibration offset, µT or mG units, and a choice of reference levels TIPS FOR A GOOD READING 1. Start away from speakers, magnetic cases and car mounts, and do the figure-8 until the number appears. 2. Hold the phone flat and sweep slowly, a few centimetres from the wall or appliance. 3. Watch for a rise against your starting level rather than one absolute number. 4. Tap "Zero here" when you move to a new room so the baseline is re-learned there. FOR GHOST-HUNTING NIGHTS Spirit Box turns the live field into pulses, vibration and spoken words. It is entertainment: field spikes come from wiring, motors, magnets and the phone itself, and no spirits are detected. A Halloween theme can be switched on in Settings. HONEST TECH NOTE A phone magnetometer measures static and slowly changing magnetic fields: steel, magnets, motors, transformers and wiring under load. It samples about ten times a second, so it cannot measure 50/60 Hz mains fields accurately, and it cannot detect radio frequency, Wi-Fi, 5G or radiation. It is not a certified safety instrument; use it to explore and compare readings around your home. Made for curious people comparing readings around appliances and from room to room, and for paranormal investigators.

About

APN切替ナビ

Features
Read full description

APN切替ナビは、iPhoneでMVNOや格安SIMを利用している方向けに、APN構成プロファイルの削除・インストール・確認手順を案内するアプリです。 物理SIMとeSIMを組み合わせたデュアルSIM環境では、利用する回線やMVNOの組み合わせによって、APN構成プロファイルの入れ替えが必要になる場合があります。 本アプリでは、利用中の2回線を登録し、使いたいデータ通信回線に応じた設定手順、公式APNページ、トラブル診断を表示します。 本アプリはAPN設定を自動変更したり、構成プロファイルを自動インストールするものではありません。実際の設定変更は、iPhoneの設定アプリ上でユーザー自身が行います。

Screenshots

EMF Detector3 screens
APN切替ナビ4 screens

Verdict

The call

The clearest difference is update cadence: APN切替ナビ at daily against EMF Detector's every 6 days. APN切替ナビ also leads on iOS requirement (13.0 vs 16.4). On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

EMF Detector ships an update every 6 days, APN切替ナビ daily. The most recent releases landed on October 24, 2026 and October 13, 2026 respectively.

Scorecard2 real differences · 7 level
EMF Detector versus APN切替ナビ: the parameters behind the verdict, then further details
ParameterEMF DetectorAPN切替ナビ
PriceFreeFree
Rating3.9 (9 ratings) — better—
Number of ratings9 — better—
Update frequencyEvery 6 daysDaily — better
AdsYesYes
In-app purchasesNoNo
MonetizationAd-supported—
DevicesiPhoneiPhone, iPod — better
Requires iOS16.413.0 — better
Further details — not scored
Size53 MB25 MB
Age rating17+17+
DeveloperKyu-Hee JangTakara Yamazaki

In-app purchases

None

EMF Detector

No in-app purchases

None

APN切替ナビ

No in-app purchases

Questions

Is EMF Detector free?
EMF Detector is free to download, with no in-app purchases.
Is APN切替ナビ free?
APN切替ナビ is free to download, with no in-app purchases.
Do EMF Detector or APN切替ナビ have ads?
Both EMF Detector and APN切替ナビ show ads.
Which is updated more often, EMF Detector or APN切替ナビ?
EMF Detector ships an update every 6 days, and APN切替ナビ daily. Most recently, EMF Detector was updated on October 24, 2026 and APN切替ナビ on October 13, 2026.

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