Heel Drop: Floor Vibration

Heel Drop turns your phone into a real vibration-analysis instrument.
Every FFT spectrum comes from your own accelerometer, computed live.
No external hardware required.

See live time-domain, FFT, and power spectral density views while you
record. Save sessions to a history list with peak frequency and RMS
acceleration. Export raw data to CSV or a professional PDF report.

Every report includes a free comparison against AISC Design Guide 11
walking-excitation limits. This is a simplified reference for engineering
judgment, not a certified compliance calculation. You interpret the
result, same as with any raw instrument reading.

Built for structural and civil engineers, architects, and NVH technicians
doing floor-serviceability checks. Bay slabs, mezzanines, gyms, rooftop
equipment platforms. One phone, one measurement, no setup.

Free tier includes live time-domain and FFT views with peak-frequency
detection, saved sessions, and PDF reports. Heel Drop Pro adds PSD
analysis, velocity and displacement integration, raw CSV export, and
unlimited saved sessions. A phone-level check runs before every recording,
so you know when tilt is contaminating the vertical reading.

Heel Drop reports raw measured data from a consumer-grade accelerometer.
It is not a certified compliance tool and does not replace a licensed
engineer's judgment.

SUBSCRIPTION TERMS
Heel Drop Pro is an auto-renewable subscription, available monthly or
annually. Prices are shown in the app in your local currency. The
subscription renews automatically unless auto-renew is turned off at least
24 hours before the end of the current period. Manage or cancel your
subscription in your Google Play account settings after purchase.

Terms of Use (EULA): https://codeensis.com/heeldrop/terms
Privacy Policy: https://codeensis.com/heeldrop/privacy

Recent changes:
Improved internal diagnostics so purchase and restore problems can be detected and fixed faster. The store listing is now available in German, Italian and Spanish. No changes to how measurements are taken or reported.