See the real spectrum.
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.
Every view, live.
Real screens from Heel Drop — time domain, FFT, PSD, session history, and the AISC DG11 comparison in each report.
Raw measured data, not a mockup.
You interpret the result, same as with any instrument reading.
One phone, one measurement.
Built for structural and civil engineers, architects, and NVH technicians doing floor-serviceability checks — bay slabs, mezzanines, gyms, rooftop equipment platforms. No setup beyond the phone itself.
See every domain live.
Watch time-domain, FFT, and power spectral density views while you record. Peak frequency and RMS acceleration update in real time, straight from the accelerometer.
Reference-checked, not guessed.
Every report includes a free comparison against AISC Design Guide 11 walking-excitation limits — a simplified reference for engineering judgment, not a certified compliance calculation.
Ready for the project file.
Save sessions to a history list, export raw data to CSV, or generate a professional PDF report with chart, metadata, and timestamp in one tap.
Three steps to a
clean reading.
A phone-level check runs before every recording, so you know when tilt is contaminating the vertical reading.
Check the phone is flat.
A level check runs first — a tilted phone contaminates the vertical acceleration reading before you even start.
Record the event.
Heel drop, footfall, or any excitation — watch time-domain, FFT, and PSD update live as the accelerometer streams.
Export what you need.
Raw CSV for further analysis, or a one-tap PDF report with the AISC DG11 comparison for the project file.
The short version.
Does Heel Drop need external hardware?
No. Every reading comes from your phone's own accelerometer, computed live on the device. There's no Bluetooth sensor to buy, pair, or keep charged.
Is Heel Drop a certified compliance tool?
No. Heel Drop reports raw measured data and a simplified AISC Design Guide 11 reference comparison for engineering judgment only — not a certified calculation, and not a pass/fail determination. It does not replace a licensed engineer's judgment.
What's the difference between Free and Pro?
Free includes live time-domain and FFT view with peak-frequency detection. Pro adds PSD analysis, velocity and displacement integration, CSV export, PDF reports, and unlimited saved sessions.
Does my measurement data leave the device?
No. Sessions, waveforms, and reports stay on your device unless you export or share them yourself. Heel Drop has no account and no cloud sync.
Know what's really moving.
A real vibration-analysis instrument, in your phone. Free tier included — no account, no external hardware.
Heel Drop reports raw measured data from a consumer-grade accelerometer and a simplified AISC Design Guide 11 reference comparison for engineering judgment only. It is not a certified engineering tool, does not constitute a compliance assessment, and does not replace a licensed engineer's judgment.