# Vibration — FFT Spectrum Analyzer

> Mobile vibration spectrum analyzer using device sensors and external accelerometers. (iPhone/iPad app by Diffraction Limited Design LLC.)

- Source: https://appshunter.io/ios/app/vibration/id301097580 (this page in markdown: same URL + `.md`)
- Developer: [Diffraction Limited Design LLC](https://appshunter.io/developer/294410307)
- Category: Business, Education
- Price: $9.99 with in-app purchases
- Rating: 4.40/5 from 9 App Store ratings · 58 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.6 · 14 MB
- Languages: American English
- Released: 2009-01-12
- Data updated: 2026-09-05
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/vibration/id301097580/reviews.md

## What is Vibration?

Vibration turns your iPhone or iPad into a true FFT vibration spectrum analyzer — a portable alternative to a commercial spectrum analyzer for machinery diagnostics, acoustic testing, and hobbyist vibration analysis.

Version 5.00 is a complete visual redesign: a modern, color-coded interface built around the way vibration technicians actually work, with clean, uncluttered screens for every channel and setting, a drag-cursor readout for reading exact values on any plot, and a crisp new PDF report you can generate and share in seconds.

MEASURE FROM ANYWHERE
- Built-in 3-axis accelerometer and gyroscope — sensitivity to about 0.02g, range ±2g
- Built-in microphone input for acoustic vibration analysis
- Digiducer professional USB accelerometer support (additional Digiducer features unlockable via in-app purchase)

ANALYZE LIKE A BENCH-TOP SPECTRUM ANALYZER
- Time series and FFT frequency spectrum on every channel, with adjustable sample rate (10 Hz–100 Hz internal, up to 48 kHz with microphone/Digiducer)
- Linear-Linear, Log-Log, Log-Linear, and Linear-Log frequency display modes
- Hamming, Hanning, and Flattop windowing
- Integrate and differentiate in the frequency domain
- RMS and peak levels per channel and combined
- Frequency averaging and peak hold
- Color-coded peaks list with the top 5 peaks per channel
- Tap-and-drag cursor readout in portrait or landscape, with magnetic snap to peaks
- Selectable data length from 256 to 4096 samples, variable start delay up to 20 seconds
- DC-remove option to eliminate the gravity vector

BUILT FOR THE FIELD
- Guided accelerometer calibration with an on-screen orientation guide, live stability meter, and a locked reposition countdown
- Trigger acquisitions from one or more accelerometer channels or the microphone
- Auto-repeat and auto-save for long-duration monitoring
- Apple Watch companion app — trigger a sample and review settings right from your wrist

DOCUMENT YOUR RESULTS
- New crisp PDF report — identical on iPhone and iPad — with time series and frequency plots and acquisition details
- Open, non-proprietary format — data saves as plain CSV you can reload in the app or open in Excel, MATLAB, or Python, and email straight to your desktop
- Save data locally and transfer with the Files app
- Screen snapshots sync to your computer like any photo

In many applications, Vibration is an excellent portable alternative to a commercial spectrum analyzer. In predictive maintenance applications it can help identify bearing defects, shaft misalignment, imbalance, and structural resonant frequencies — and it's equally useful for monitoring the acceleration of part and material handling equipment.

Further development and additional features are planned. Use the email links in the app to request features or report issues.

## Key features

- Built-in accelerometer and gyroscope analysis
- Internal microphone and external Digiducer support
- Adjustable sample rates and data lengths
- FFT and frequency spectrum plotting
- DC bias removal and Hamming window
- Data export via email and iTunes
- Apple Watch companion app for triggering

## Pricing and in-app purchases

Base price: $9.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Enable full Digiducer functionality | $19.99 | one-time |


## Chart rankings

- #64 in Top Paid · Business (US App Store)

## Recent user reviews (10 of 58)

All indexed reviews: https://appshunter.io/ios/app/vibration/id301097580/reviews.md

### 3/5 — Simple and nonfunctional

*2023-08-24, version 4.10*

Didn’t work for me, might work for you. Randomly cut recordings short after a few seconds then locked up and tried to text the data file, at which the cancel button greyed out. Documentation looks like freeware from 1998.

### 4/5 — Stopped working

*2022-01-29, version 4.04*

I had this app for several years and it suddenly stopped working -- no longer records, saves or allows contact with developer. Disappointing.

### 5/5 — Simple and effective

*2020-11-28, version 3.91*

I’ve used this for several years to collect vibration signals from vehicles and trickier s for research purposes. It’s easy to use and I recommend to my students.

### 5/5 — Brilliant app

*2018-02-25, version 3.60*

Does exactly what it claims to, measures vibration up to 50Hz. 

Lots of control regarding sampling rate, time and delay. 

Files can be saved and exported as CSV. 

Spectrum analysis could use some more labels but nevertheless very good app.

### 5/5 — Solid App

*2017-12-22, version 3.60*

Bought this app over 5 years ago because the vibration sensor we were using in the lab wasn’t quite working for our need. We wanted to know the vibration noise source for a piece of equipment we were designing. With this app, we were able to determine the peak frequencies, and therefore the source of our noise. Impressed the whole team with the fact that it was an iPhone that solved the mystery. Ever since then this app has been a fun toy at home.

### 3/5 — Mostly good, but possibly flawed

*2017-10-09, version 3.55*

I was impressed to find such a technically advanced app. However when I use the microphone input on an iPhone, the sound frequencies appear to be represented in the spectrum view at twice their actual frequency. I haven't put it on the bench yet, but when I calibrate a whistle or sing tone with another app, the Cleartune app, the tones are represented in this Vibration app at twice the frequency registered in the Cleartune app. I have used the Cleartune app to practice various pieces of music and it seems spot on.

### 5/5 — Lovely!

*2017-09-28, version 3.55*

Great app. I use it to analyse resonance and vibration in my 3D printer as I add and replace components. The ability to email the data to myself in spreadsheet form is much appreciated.

### 4/5 — slightly disappointed by the update

*2017-05-29, version 3.55*

Whilst it is 'technically accurate' I found the claim that "It is now possible to select an external microphone as a data source" rather misleading.

In fact, it appears that the in-App purchase [at a cost of £14.99] serves to only "Enable full Digiducer functionality".

The Digiducer itself is an excellent, but not inexpensive device, and I would have been MUCH happier if the option was available to use ANY external USB microphone for qualitative work.

That said; the App remains excellent !!
.
.
Note: I have already twice attempted to submit this review, but neither has appeared ... Perhaps that was because I included links to the Digiducer website. [?]

### 5/5 — State of art,  5 stars application of the year!

*2016-05-22, version 3.50*

It is a state of the art.  The best program I have ever used in my life including  all PC software.

### 5/5 — Great app.

*2015-12-03, version 3.05*

This app turns determining natural frequencies from a 20 minute exercise to a 5 second one. Very well put together! You've made my calcs a lot easier!

## Frequently asked questions about Vibration

### What does this vibration analysis app do?

This app functions as a portable vibration spectrum analyzer. It utilizes your device's built-in accelerometers and gyroscope to acquire and display time-series vibration data. It can also process this data by removing DC bias, applying a Hamming window, and performing a Fast Fourier Transform (FFT) to generate frequency spectra.

### What are the key features of this vibration app?

Key features include sampling from internal accelerometers, gyroscope, microphone, and professional external Digiducer accelerometers. It offers adjustable sample rates, data lengths, and variable start delays. The app can also remove DC bias, apply a Hamming window, plot frequency data in various formats, and export results via email or iTunes.

### How much does this vibration analysis app cost?

The base application is free to download. However, certain advanced features, such as higher sample rates for the internal microphone and Digiducer accelerometers, can be enabled via in-app purchases.

### What devices is this vibration analyzer compatible with?

The app is designed for iPod Touch and iPhone devices. It also features an Apple Watch companion app for triggering sampling and reviewing settings, indicating compatibility with Apple Watch models paired with compatible iPhones.

### What are common use cases for this vibration analysis app?

This app is useful for predictive maintenance applications, helping to identify issues like bearing defects, shaft misalignment, and imbalance in machinery. It can also monitor the acceleration of part and material handling equipment, serving as a portable alternative to commercial spectrum analyzers.

## Version history (last 5 releases)

### 5.01 — 2026-07-29

- Apple Watch reliability improvements: the watch screen now shows
  the current sensor and settings as soon as it opens, and updates
  correctly when the iPhone app is launched
- Bug fixes and stability improvements

### 5.00 — 2026-07-22

Version 5.00 is our biggest update ever — a complete visual redesign of Vibration.

- All-new, modern interface — clean, uncluttered screens for every channel and setting
- Color-coded channels throughout, so it's always clear which trace is which
- Drag-cursor readout — touch and drag on any plot to read exact values, with magnetic snap to peaks, in portrait or landscape
- Guided accelerometer calibration — on-screen orientation guide, live stability meter, and a locked reposition countdown
- Brand-new PDF report — crisp, professional, and identical on iPhone and iPad, with time series and frequency plots and acquisition details
- Refreshed app icon and launch experience

Under the hood, everything you rely on is still here: built-in accelerometer, microphone, and Digiducer input, full FFT analysis, and the Apple Watch companion app.

As always, use the email links in the app to send feedback or report an issue — thank you for using Vibration.

### 4.19 — 2026-06-01

• Fixed a bug where rms values were not display propelry in the Peaks window after integration
• Modified the frequency rms computation to exclude more data near 0 frequency since this was biasing the results, particularly after integration of the frequency data

### 4.18 — 2026-03-19

• Added driver for Sabrent input/output dongle allowing for direct input of electrical signals.
• Fixed a bug where Peak Hold and Running Averages did not work properly for all input modes
• Other miscellaneous bug fixes.

### 4.11 — 2023-11-29

• Improved the anti-aliasing filter for Fmax values less than 4 kHz for microphone and external sensor inputs.
• Added ability to turn On/Off time series display channels

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## More apps by Diffraction Limited Design LLC

- [Vibration Pro](https://appshunter.io/ios/app/vibration-pro/id1521077799)

All apps by Diffraction Limited Design LLC: https://appshunter.io/developer/294410307

## Related topics

[vibration analysis](https://appshunter.io/ios/topics/vibration-analysis) · [spindle vibration test](https://appshunter.io/ios/topics/spindle-vibration-test)

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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 2026-09-05.*