Test your cartridge lifespan and IEC 60098 tonearm null points live below, or place your iPhone on the mat with StrobeHz to measure true 60 Hz gyroscope RPM, musical pitch drift in cents, and printable 1:1 arc protractors offline.
Single-purpose RPM apps check platter speed once and gather dust while silent diamond wear and misaligned headshells chisel high-frequency sibilance into your records every evening.
A stretched elastomer belt running just +0.85% fast pushes A440 tuning sharp by +14.6 cents. StrobeHz samples the iPhone Z-axis MEMS gyroscope at 60 Hz (`abs(omega) * 60 / 2pi`) to separate steady-state speed offset from cyclic RMS and Peak-to-Peak Wow & Flutter.
Bonded elliptical styli (*Ortofon 2M Red, Nagaoka MP-110, AT-VM95E*) develop flat contact shoulders around 300 hours, while nude MicroLine ridges (*AT-VM95ML, 2M Bronze*) distribute tracking force across 800 hours. Logging +1 LP Side (21 minutes) takes one tap when you sleeve a record.
Instead of blurry scanned JPEGs scaled wrong by browser print dialogs, StrobeHz computes exact Chebyshev and RMS null radii from your pivot-to-spindle distance and renders vector `PDFKit` sheets at `72 / 25.4 pt/mm` with an on-page 100.0 mm physical ruler check.
Compare how StrobeHz consolidates speed stability, stylus wear telemetry, and tonearm alignment against abandoned App Store RPM utilities.
| Calibration Capability | StrobeHz Studio | Legacy RPM Gyro Apps | Paper Protractor + Guesswork |
|---|---|---|---|
| 33 1/3, 45.00 & 78.26 RPM + Cents Pitch | 60 Hz Z-axis gyro, signed % error, musical cents, ±0.15% Quartz Lock | Basic RPM readout only; rarely calculates musical cents or 78.26 archival standard | Requires physical neon strobe disc matching local 50/60 Hz mains frequency |
| RMS & Peak-to-Peak Wow & Flutter | Live angular velocity waveform + dual RMS and Peak-to-Peak % | Single uncalibrated number or locked behind fragmented add-ons | Impossible to measure by ear below 0.25% drift |
| Phono Stylus Hour Odometer | 10 built-in cartridges (300h to 800h profiles), 1-tap +21m LP side counter, VU meter | Absent; zero tracking of diamond tip wear or VTF specs | Paper tally marks easily forgotten beside the sleeve shelf |
| Baerwald, Lofgren B & Stevenson Protractor | Exact pivot-to-spindle solver + 1:1 printable vector PDF with 100.0 mm check bar | Absent | Generic two-point sheet not matched to your arm's effective length arc |
| Privacy & Listening-Room Ergonomics | 100% offline, zero accounts, smoked obsidian dark chassis, zero ad SDKs | Flashing white banner ads in dark rooms; third-party tracking SDKs | Offline, manual calculation required |
Download StrobeHz for iPhone and iPad to unlock live platter gyroscope measurements, tactile post-spin stylus logging, and AirPrint 1:1 tonearm protractors with zero mandatory sign-up.
Place a clean 45-RPM puck or small tape roll over the center spindle so your iPhone rests flat and centered on the mat, or place it symmetrically beside the spindle on high-torque direct-drive platters. Because gyroscopes measure angular velocity (`rad/s`), centering minimizes off-axis centrifugal wobble during Wow & Flutter capture.
Choose Baerwald (IEC) (`66.0 / 120.9 mm` null points) for balanced low distortion from start to finish across most rock and jazz LPs. Choose Lofgren B (`70.2 / 116.2 mm`) for the lowest RMS distortion across the middle 75% of the record. Choose Stevenson (`60.3 / 117.4 mm`) if you listen heavily to long orchestral classical pressings with loud crescendos cut right near the inner label.
A bonded elliptical tip has a small circular contact patch that wears flat around 300 hours (about 857 twenty-one-minute LP sides, or ~$0.104/side). A nude MicroLine ridge maintains its narrow tracing profile up to 800 hours (~2,285 LP sides, or ~$0.065/side) while dramatically reducing inner-groove pinch distortion.
No. CoreMotion gyroscope telemetry, stylus wear logs, and PDF protractor rendering execute 100% locally on your iPhone and iPad with zero account wall and zero third-party ad networks.