House ECG
Long-term building vibration
Only for iPhone
Free
iPhone
Turn a dedicated iPhone into a long-term building vibration monitor. Establish the building's initial rhythm, save candidate events, and compare changes over time.
Every building has its own vibration rhythm. House ECG uses the motion sensors in a dedicated iPhone to observe that rhythm over time—much like a long-term ECG for a house.
Mount an iPhone 8 or newer at a fixed structural point, connect continuous power, place the screen face up, and keep House ECG open in the foreground. The app measures motion 50 times per second, establishes an initial reading for that exact installation point, and compares later stable observations with the same point.
House ECG includes:
- Three-direction vibration measurement, with north–south and east–west directions shown only when the phone's direction reading is reliable.
- Welch spectral averaging with Hann windows and 50% overlap to reduce the influence of incidental bumps and noise.
- A low-cost continuous watcher that performs fuller analysis only after a candidate vibration is detected.
- Local candidate-event history and user labels for earthquake-like events, traffic, machinery, impact, device movement, or unknown events.
- On-device SQLite storage for initial readings, history, and raw candidate-event waveforms.
- Optional Sign in with Apple for Email notifications; basic monitoring does not require an account.
- Optional comparison with the public USGS global earthquake catalog, approximate address, and weather context when an Email notification is requested.
- Clear installation guidance and automatic reminders to create a new initial reading after moving, lifting, remounting, rotating, or changing floors.
House ECG was conceived by a Taiwan-licensed civil engineer and National Taiwan University graduate who has participated in earthquake-related work since the 1999 Chi-Chi earthquake. The method is grounded in established vibration-analysis practice and is being improved through long-term field testing.
Important: House ECG is a change-screening and field-observation tool. It is not a certified seismometer, earthquake early-warning system, structural safety certificate, or substitute for an inspection by a qualified professional. It does not declare a building safe or unsafe.
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The developer, 綠圖顧問有限公司, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Location
- Contact Info
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- ChartGreen Consult Ltd.
- Size
- 2.9 MB
- Category
- Utilities
- Compatibility
Requires iOS 16.0 or later.
- iPhone
Requires iOS 16.0 or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Traditional Chinese
- Age Rating
4+
- 4+
- Copyright
- © 2026 ChartGreen Consult Ltd.