Seismo: Vibration Meter
iOS app by Denys Parish. Utilities · Denys Parish
- Store rating
- 0 / 5
- Store rating count
- 0
- Download price
- Free to download
- In-app purchases
- Unknown
- Version
- 1.0
- Listing last refreshed
- 2026-09-15
View the original store listing
Store description excerpt
Seismo turns your iPhone into a real-time mechanical-vibration instrument. Point it at a wobbling washing machine, a droning HVAC unit, an idling engine, a spinning fan, a workbench, or a floor — and read what's actually happening. A living seismograph trace writes itself across an oscilloscope grid while a big, monospaced readout locks onto the dominant frequency. It's calm, exact, and built like a precision instrument, not a toy. No account. No ads. No subscription. Everything runs on-device and offline. — What it measures — • Live waveform — a continuously drawn seismograph trace on a fine oscilloscope grid, with a glowing leading dot that snaps when it locks onto a stable frequency. • Dominant frequency & RPM — the giant hero number, in Hz or RPM. • Amplitude & severity — RMS velocity (mm/s) graded on an ISO-10816-style green→amber→red scale (Zones A–D), plus peak g and crest factor. • Frequency spectrum — a live FFT bar chart from 0–50 Hz with a tagged peak and 1×/2×/3× harmonic cursors, in linear or log scale. Touch the chart to inspect any frequency — the cursor snaps to nearby peaks. • Fault diagnosis — a guided timed capture produces a plain-English verdict: imbalance, misalignment, looseness, or bearing wear, with a confidence level and a short explanation of *why*. — How it works — Seismo reads the iPhone's built-in motion sensors (CoreMotion accelerometer and gyroscope) and runs the signal through a fast Fourier transform (Apple's Accelerate framework). It integrates acceleration to velocity the same way industrial vibration analyzers do, then reads the harmonic signature of the spectrum to suggest a likely fault. Rest the phone flat and firm against the machine, tap start, and watch the numbers settle. — Honest about accuracy — This is a feature, not fine print. Phone accelerometers sample at about 100 Hz, so Seismo analyzes the 0–50 Hz band — the range where most machine faults live — and they are not lab-calibrated. That means Seismo is excellent for what most people actually need: relative comparison, dominant-frequency identification, trend tracking, and fast triage. The method (ISO velocity integration and harmonic-signature analysis) is industry-correct; the absolute numbers are device-relative. Use it to answer "is this worse than last week?" and "what is this vibration?" — not as a certified, safety-critical, or warranty-grade instrument. — Built for — DIYers, appliance / HVAC / auto repair, machinists and woodworkers, facilities and maintenance teams, audio installers, and anyone curious whether a vibration is normal — and what it is. — Also includes — • Records — save measurements per machine, watch trends, export to CSV/PDF. • Guide — what frequencies mean, ISO severity explained, how to mount the phone, and an honest note on accuracy. • Shortcuts & widgets — start a measurement via Siri / App Intents; see a machine's last reading or severity on the Home Screen. • Units your way — g or m/s²; m
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