Horizontal Accelerometer vs G
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Horizontal Accelerometer
This tool measures real-time horizontal acceleration, deceleration, and lateral G-force for automobiles. It features color-coded zones and sounds for easy understanding while driving and can also be used for engineering education and evaluating structural rigidity.
- Real-time horizontal acceleration measurement
- Measures deceleration and lateral G-force
- Color zones and sound alerts for values
- Calibration for accurate readings
- Peak hold and max value tracking
- Adjustable color zone thresholds and sound
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“Horizontal Accelerometer” displays horizontal acceleration in real time and uses sound to indicate changes in acceleration. (Uses) • Automotive: Measures vehicle acceleration, deceleration, and lateral G-force. Color zones and sound make changes in acceleration easier to recognize while driving. • Table leg rigidity testing: Evaluate the rigidity of table legs by measuring acceleration. • Engineering education: Students can measure and experience acceleration firsthand, helping them understand the equations of motion. • Children’s toy: The Smooth mode of the Acceleration intensity sound feature, which changes sound according to acceleration, is a big hit with children! • Musical instrument: You can also use it as a musical instrument. Give it a try! (How to Use) 1. Secure the Device Secure your device (iPhone or iPad) to the object being measured. It does not need to be level. • Measuring vehicle acceleration: Secure the iPhone firmly to the dashboard at an angle that makes the screen easy to see. • Testing table leg rigidity: Place the iPhone on the tabletop. If it slides when you shake the table, secure it with tape or a similar material. • Using it as a toy: Hold it in your hand and move it around freely. 2. Calibration Tap “Calibration" button, then tap "Calibrate". The horizontal acceleration value will begin to appear. When measuring vehicle acceleration, perform calibration while the vehicle is stationary on a level road. 3. Acceleration intensity sound When Acceleration intensity sound is enabled, sound begins playing in response to acceleration as soon as the horizontal acceleration value starts being displayed. (Screen Display) • The number at the top of the screen shows the real-time horizontal acceleration value. • Peak Hold shows the peak horizontal acceleration value. It resets after the configured time has elapsed. • Max shows the maximum horizontal acceleration value. Tap Reset Max to reset it. • The acceleration value can change color to red or yellow according to the configured thresholds. (Sound) • Acceleration intensity sound can be turned on or off. You can choose between Smooth and Step modes for sound variation. • Sound can be played when the acceleration value changes color. • Adjust the volume using the iPhone’s volume buttons. Sound also stops when you close the app. (Calibration Dialog) Tap “Calibration" button on the main screen to open the Calibration dialog. • Run Calibration: Calibrates the device in its current mounted position. • Load Calibration: Loads a previously saved calibration. • Save Calibration: Saves the current calibration. (Settings Dialog) Tap “Settings" or "Settings / Remove Ads” button on the main screen to open the Settings dialog. • Settings: Opens the Settings screen. • Remove Ads & Add Features: Opens the in-app purchase screen. (Settings Screen) • Color zone (Value G or more): Set the color zone thresholds and turn color changes and sound on or off. • Peak hold time (s): Set how long the peak value is retained. • Harshness cut filter: Turn the Harshness Cut Filter on or off. Harshness refers to impact vibrations. • Desensitization (%): Set the percentage by which sensitivity is reduced. • Acceleration intensity sound: Turn the feature on or off and select Smooth or Step mode. • The values in parentheses to the right of each setting indicate the default values. (Notes) • Tilting the device also tilts the horizontal plane established during calibration, causing the acceleration value to change. • Do not look at or operate the device screen while driving. Secure the device and complete all necessary settings in a safe location before driving. • The developer assumes no responsibility for any loss or claims by third parties which may arise from the use of this app. Terms of Use: This application is provided under the Apple Standard End User License Agreement (EULA). https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
G
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「G-Trace」は、日常の作業中における転倒や衝突リスクのほか、周囲の騒音・明るさなどの職場環境を継続的にモニタリングし、記録・評価するための「総合セーフティロガーアプリ」です。 iPhoneをポケットに入れたり、机の上に置いておくだけで、各種センサーがあなたの労働環境を自動で数値化し、安全と健康を守るための目安を提供します。 【主な機能】 ■ 転倒・衝突リスク検知(加速度センサー) 激しい加速度(G)を検知すると、画面表示と強力なバイブレーションで警告します。いつ、どれくらいの衝撃があったかを自動でカレンダーとタイムラインに記録するため、日々の安全管理やヒヤリハットの記録・振り返りに役立ちます。 ■ 職場環境の騒音モニタリング(音量・デシベル測定) 周囲の音量(dB)をリアルタイムで測定し、「静か」「適切」「ややうるさい」などのステータスを表示します。パネルをタップすると、厚生労働省の「快適職場指針」に基づく50dB以下の推奨ラインや、情報漏洩を防ぐ「マスキング効果」についての詳細なガイドラインを確認できます。 ■ 職場環境の照度モニタリング(明るさ・ルクス測定) 現在の机上面などの明るさ(lx)を自動で測定し、JIS規格に基づく推奨ルクス(事務室なら500〜750lx等)を満たしているかを評価します。パネルをタップすることで詳細な照度基準を確認でき、眼の疲労を防ぐための適切な照明環境づくりをサポートします。 ■ 振り返りやすいカレンダー&タイムライン 過去に検知された衝撃データは、月別・日別のカレンダーでひと目で確認可能です。画面下部のタイムラインでは、発生時刻と最大Gをリスト形式で詳細に振り返ることができます。 【プライバシーとバッテリーへの配慮】 ・プライバシー保護の徹底:マイクやカメラの機能は、純粋に「音のエネルギー」と「光の強さ」の数値を計算するためだけに使用されます。音声の録音や通話の傍受、映像の録画・保存・外部サーバーへの送信は一切行われません。安心して常時起動させておくことができます。 ・パフォーマンスの最適化:バッテリー消費を最小限に抑えるため、バックグラウンドでの演算処理やフレームレートを極限まで最適化しています。長時間の作業でもiPhoneのバッテリー負担を軽減します。 G-Traceを利用して、より安全で、より快適なワークスペースを実現しましょう。
Screenshots
Verdict
The clearest difference is in-app purchases: G at none against Horizontal Accelerometer's 1. G also leads on ads (none vs shown). Horizontal Accelerometer's advantage is iOS requirement (15.0 vs 26.2). On price, update cadence 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
Both are free to download. Horizontal Accelerometer sells 1 one-off in-app purchase. G asks for nothing beyond the download.
Horizontal Accelerometer ships an update every 6 weeks, G every 3 weeks. The most recent releases landed on October 26, 2026 and October 28, 2026 respectively.
| Parameter | Horizontal Accelerometer | G |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| Update frequency | Every 6 weeks | Every 3 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 26.2 |
| Further details — not scored | ||
| Size | 8 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Takao Ichimura | MASAKAZU KUROKI |
In-app purchases
Horizontal Accelerometer
- Remove Ads & Add Features$5.99
G
No in-app purchases









