# Seismo: Vibration Meter

> Seismo: Vibration Meter (iPhone/iPad app by Denys Parish.)

- Source: https://appshunter.io/ios/app/seismo-vibration-meter/id6787096570 (this page in markdown: same URL + `.md`)
- Developer: [Denys Parish](https://appshunter.io/developer/6787096573)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 4 MB
- Languages: English
- Released: 2026-07-09
- Data updated: 2026-07-21
- User reviews in markdown: https://appshunter.io/ios/app/seismo-vibration-meter/id6787096570/reviews.md

## What is Seismo?

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; mm/s or in/s; Hz or RPM.
• Machine-size severity — ISO 10816-1 zone limits for four machine classes,
  from appliances to large industrial units.
• Light and dark "CRT graphite" themes, haptic peak-lock, and full offline
  operation.

Private by design. Motion data is analyzed entirely on your device and never
leaves your phone. No data collection, no tracking, no analytics, no network
calls. App Store privacy label: Data Not Collected.


## Version history (last 1 release)

### 1.0 — 2026-07-09

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-21.*