Comparison

Vibration vs Private Voice Recorder

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Vibration

This app analyzes vibration spectrums using your device's sensors. It can process time-series data, remove DC bias, apply windows, and perform FFT for frequency analysis. Results can be emailed for documentation.

Highlights
  • 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
Features
Currently charting
Read full description

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.

About

Private Voice Recorder

Securely record and store voice notes, conversations, and important moments with password protection and high-quality audio. Organize and share recordings with ease, ensuring your private data remains inaccessible to others.

Highlights
  • Password protection
  • High-quality audio recording
  • Intuitive organization
  • Secure sharing
  • Easy-to-use interface
Features
Read full description

Discover the ideal application to protect your personal and confidential voice recordings. With its intuitive interface and powerful security features, you can capture voices, voice notes, or important moments with the peace of mind of knowing they will remain private and inaccessible to prying eyes. - PASSWORD PROTECTION: Set a strong password to ensure only you can access your voice recordings. Your privacy is safe with Secure Voice Recorder. - HIGH QUALITY RECORDINGS: Capture crystal clear, detailed sounds with the highest possible audio quality. Your recordings will be crisp and clear. - INTUITIVE ORGANIZATION: Easily organize your recordings into a quick-access, intuitive list. - SECURE SHARING: If you want to share a recording, you can do it safely and quickly. - EASY USE: The user interface is simple and intuitive, making the app accessible to everyone, even those who are not tech savvy. Protect your secrets, memories and important information with this app. Download the app today and start recording and storing your entries securely and privately. Your peace of mind is our priority. Subscription and Purchase Information: You may purchase an auto-renewing subscription or a one-time purchase through an In-App Purchase. Auto-renewable subscription: • Annual with 3-Days Free Trial • Your subscription will be charged to your iTunes account at confirmation of purchase and will automatically renew (at the duration selected) unless auto-renew is turned off at least 24 hours before the end of the current period. • The account will be charged for renewal within 24 hours prior to the end of the current period. • Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase. One-time Purchase: • A non-consumable purchase is available for lifetime access to Pro features. Privacy Policy: https://sites.google.com/site/privacycoldat/ Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Vibration4 screens
Private Voice Recorder4 screens

Verdict

The call

Vibration and Private Voice Recorder both sit at 4.4 stars, but that hides the real split: 79% of Vibration's written reviews are positive against 0% of Private Voice Recorder's. Vibration also leads on ads (none vs shown) and chart position (#127 vs unranked). Private Voice Recorder's advantage is price (Free vs $9.99) and ratings volume (105 vs 9). On rating, update cadence, in-app purchases and monetization model there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Private Voice Recorder is free to download; Vibration costs $9.99 up front. Vibration sells 1 one-off in-app purchase and Private Voice Recorder sells 1 in-app purchase, starting at $14.99 per year. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.4 for Vibration against 4.5 for Private Voice Recorder. That said, the two scores are not equally well evidenced: Private Voice Recorder has 105 ratings behind it against 9, so its average is the more settled of the two. Written reviews are what separate them: 79% of Vibration's written reviews are positive against 0% of Private Voice Recorder's.

UpkeepUpdate frequency

Vibration ships an update every 6 weeks, Private Voice Recorder monthly. The most recent releases landed on September 23, 2026 and September 26, 2026 respectively.

Scorecard6 real differences · 5 level
Vibration versus Private Voice Recorder: the parameters behind the verdict, then further details
ParameterVibrationPrivate Voice Recorder
Price$9.99Free — better
Rating4.4 (9 ratings)4.5 (105 ratings) — better
Positive reviews79.3% of reviews — better0.0% of reviews
Number of ratings9105 — better
Update frequencyEvery 6 weeksMonthly — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank#127 — better—
DevicesiPhone, iPad, Apple WatchiPhone, iPad, iPod, Mac — better
Requires iOS17.615.0 — better
Further details — not scored
Size14 MB18 MB
Age rating4++4
DeveloperDiffraction Limited Design LLCEmanuele Floris

Customer experience

Vibration

All ratings9 ratings
Positive77.8%
Neutral22.2%
Negative0.0%
Written reviews58 reviews
Positive79.3%
Neutral8.6%
Negative12.1%

Private Voice Recorder

All ratings105 ratings
Positive87.6%
Neutral4.8%
Negative7.6%
Written reviews9 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

1 purchases

Vibration

One-time1
  • Enable full Digiducer functionality$19.99
1 purchases

Private Voice Recorder

Subscriptions1
  • Premium Access3 Days trial$14.991 Year

Questions

Is Vibration free?
Vibration costs $9.99, and also offers in-app purchases.
Is Private Voice Recorder free?
Private Voice Recorder is free to download, with in-app purchases available.
Which has better reviews, Vibration or Private Voice Recorder?
Private Voice Recorder is rated higher. Vibration averages 4.4 out of 5 from 9 ratings, while Private Voice Recorder averages 4.5 from 105 ratings.
Do Vibration or Private Voice Recorder have ads?
Private Voice Recorder shows ads; Vibration does not.
Which is updated more often, Vibration or Private Voice Recorder?
Vibration ships an update every 6 weeks, and Private Voice Recorder monthly. Most recently, Vibration was updated on September 23, 2026 and Private Voice Recorder on September 26, 2026.

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