Comparison

VoltKeep vs EMF Scan

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

Head to head
About

VoltKeep

Features
Read full description

VoltKeepは、Tesla公式のFleet Telemetryを使って走行・充電・バッテリーをリアルタイムに記録するダッシュボードアプリです。車両へのポーリングを行わないためバッテリーに優しく、走行データはエンドツーエンド暗号化であなただけのものになります。 ■ 主な機能(無料) ・リアルタイムダッシュボード: バッテリー残量・航続距離・車両の現在地・車内外の温度 ・タイムライン: トリップ(ルート地図・距離・電費・速度ヒートマップ)と駐車・充電を時系列で自動記録 ・充電履歴: 充電セッションを自動検出し、バッテリー%・kWh・充電速度を表示 ・電費分析: Wh/kmの推移と日次サマリー ・セントリーモードとバッテリードレインの記録 ■ VoltKeep Pro(7日間無料トライアル) ・スーパーチャージャー充電履歴: サイト名と実際の請求額をタイムラインに表示。電気代は実費で自動補正 ・全期間の走行履歴(無料版は直近7日) ・月次レポート&AI運転分析: 1ヶ月のルートマップ、ドライブカレンダー、AIによる電費の深掘り ・バッテリー健康度の長期トレンドとPDFレポート ・充電予約コマンド、複数車両、CSVエクスポート ■ プライバシー・セキュリティ ・走行データはX25519+AES-256-GCMでエンドツーエンド暗号化。サーバー上でも中身は読めません ・走行・充電データを第三者に販売・共有することはありません ■ ご利用に必要なもの ・Teslaアカウント ・Fleet Telemetry対応車両 ※本アプリはTesla, Inc.が提供する公式アプリではありません。TeslaはTesla, Inc.の商標です。 利用規約(EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

EMF Scan

Features
Read full description

Measure electromagnetic fields (EMF) in real time using your smartphone's built-in magnetic sensor. [Key Features] • Real-time magnetic field strength display (switch between µT / mG) • Automatic saving of measurement data and history management • Map view of measurement locations • Sound alarm (volume changes with field strength) • Color themes (11 in total — dark and light pastel) • Ad-removal option (one-time purchase; also unlocks some color themes) [Great For] • Anyone concerned about magnetic fields around home appliances or power lines • Anyone who wants an easy alternative to a dedicated EMF meter • Anyone who wants to record and manage measurement data * This app uses your smartphone's magnetic sensor. Its accuracy differs from that of a dedicated measuring instrument.

Screenshots

VoltKeep3 screens
EMF Scan4 screens

Verdict

The call

The clearest difference is ads: VoltKeep at none against EMF Scan's shown. EMF Scan's advantage is iOS requirement (13.0 vs 17.0). On price, update cadence, 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. VoltKeep sells 2 in-app purchases, starting at $4.99 per month and EMF Scan sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

VoltKeep ships an update every 3 days, EMF Scan weekly. Both last shipped on October 31, 2026.

Scorecard2 real differences · 4 level
VoltKeep versus EMF Scan: the parameters behind the verdict, then further details
ParameterVoltKeepEMF Scan
PriceFreeFree
Update frequencyEvery 3 days — betterWeekly
AdsNo — betterYes
In-app purchasesYesYes
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.013.0 — better
Further details — not scored
Size74 MB29 MB
Age rating4+4+
DeveloperYuto FurudateYasuhiro Kodama

In-app purchases

2 purchases

VoltKeep

Subscriptions2
  • Monthly Plan7 Days trial$4.991 Month
  • Yearly Plan7 Days trial$49.991 Year
1 purchases

EMF Scan

One-time1
  • 広告を削除$0.99

Questions

Is VoltKeep free?
VoltKeep is free to download, with in-app purchases available.
Is EMF Scan free?
EMF Scan is free to download, with in-app purchases available.
Do VoltKeep or EMF Scan have ads?
EMF Scan shows ads; VoltKeep does not.
Which is updated more often, VoltKeep or EMF Scan?
VoltKeep ships an update every 3 days, and EMF Scan weekly. Most recently, VoltKeep was updated on October 31, 2026 and EMF Scan on October 31, 2026.

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