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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. Payment is charged to your Apple ID account at confirmation of purchase. The subscription renews automatically unless auto-renew is turned off at least 24 hours before the end of the current period. Your account is charged for renewal within 24 hours before the period ends. You can manage or cancel your subscription in your App Store account settings after purchase. Terms of Use (EULA): https://codeensis.com/heeldrop/terms Privacy Policy: https://codeensis.com/heeldrop/privacy
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