Comparison

Ultrasonic Analyzer vs Audio Spectrum Analyzer Pro

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

Head to head
About

Ultrasonic Analyzer

This app provides real-time audio analysis with visual representations of sound frequencies. It allows users to listen to and analyze ultrasounds, with options for transposed playback and slowed-down analysis of inaudible sounds. It supports various sampling rates and offers detailed charting and measurement tools.

Highlights
  • Real-time spectrum analysis
  • Spectrogram and oscilloscope views
  • Octave RTA analyzer
  • Transposed ultrasound listening
  • Slowed-down playback
  • High sampling rates up to 384kHz
  • Zoom and pan capabilities
Read full description

Ultrasonic Analyzer is a real-time spectrum, spectrogram, oscilloscope, and octave RTA analyzer for your iPhone or iPad. It provides a visual representation of ultrasounds using a sampling rate of up to 384kHz**. You can listen to transposed ultrasounds* and analyze them in real time. For sounds that are normally inaudible, a slowed-down playback option is also available. Ultrasonic Analyzer can be used to analyze the calls of various animals (e.g., bats, dolphins), measure the frequency response of high-end audio equipment, or evaluate ultrasonic sensors. Additionally, it allows you to analyze short imported audio files within a spectrogram context. Features - Sampling rates: 44.1kHz, 48kHz, 96kHz, 192kHz, 200kHz, 250kHz, 384kHz** - Real-time transposed ultrasound listening during recording* - Spectrogram analyzer: Color and black & white modes - Spectrum analyzer - Oscilloscope (full FFT window size) - Octave RTA analyzer: Bands – full, 1/3, 1/6, 1/12 (RMS values) - Max/min Octave RTA values - dBFS Meter - Fast real-time response - Adjustable spectrogram frequency resolution - Configurable time interval between FFT computations, with values as low as 1ms or even lower - Fast Fourier Transform (FFT) - FFT window sizes: 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536 - Recording trigger: Automatically triggers based on specified frequency bands - Zoom and pan capabilities for all charts - Measurement tools available in all charts - Playback analysis - Transposition during playback - Slow-down playback: Transpose octaves down for easier analysis - Picture-in-Picture (PIP) mode: Allows simultaneous spectrogram analysis with a secondary chart (Octave RTA, Spectrum, or Oscilloscope) - Audio input support: Built-in microphone, external microphone (via USB camera adapter or iPhone/iPad dock connector – Core Audio compliant devices) - Sharing options: Share charts and audio recordings via email, social networks, or clipboard - Exporting capabilities: Save audio recordings (WAV) and image charts (PNG) to iOS Document Browser - Audio file import: Load short audio files from other apps or the iOS Document Browser - Supported audio formats: WAV, CAF, AAC, MP3 - Automatic sample rate conversion for imported files - Frequency scale options: Linear and logarithmic - Amplitude scale options: Linear and logarithmic (dBFS) - dBFS Meter weighting: dBZ (linear) - Adjustable spectrogram length (dependent on resolution settings) Tested with (via USB adapter): - Dodotronic Ultramic200K, Ultramic250K, Ultramic384K - Pettersson M500-384 - Avisoft UltraSoundGate 116Un Make sure you are using the latest iOS update. *Requires an external microphone with ultrasonic capabilities connected via a USB adapter. **Real-time analysis at a 96kHz sample rate or higher is only possible with an external USB microphone. Alternatively, you can import files recorded on an external device for non-real-time analysis.

About

Audio Spectrum Analyzer Pro

Analyze sound frequencies in real-time with this powerful tool. It offers detailed octave band analysis, FFT plots, and various measurement scales. Supports multiple microphones and noise analysis features for accurate audio insights.

Highlights
  • Octave Band Real Time Analyzer
  • FFT Plot (Fast Fourier Transform)
  • Sound level meter (dB meter)
  • Noise Rating and Noise Criterion support
  • Support for external microphones
  • Pre-calibrated mic profiles
Features
Read full description

Audio Spectrum Analyzer is a powerful real-time audio analysis app. Full of features yet very simple to use. Sound level meter (db meter a-weighted, noise rating, noise criterion) included. Feature Highlights: • Octave Band Real Time Analyzer • FFT Plot (Fast Fourier Transform) • Linear and logarithm scales • Up to 16384 FFT size • A lot of available window functions • Tracking for max value • Max and Min for any selected frequency • Stunned graphics • Reliable measurement accuracy with pre-calibrated profiles for 3 device-integrated mics • Additional precision with integrated support and pre-calibrated profiles for AirPods, AirPods Pro • Safer measurements using the Airpods Pro noise cancellation feature • Support for external microphones (wired or via Bluetooth) • Noise Rating and Noise Criterion support And many many more... Terms of Use: https://www.iubenda.com/terms-and-conditions/94359518

Screenshots

Ultrasonic Analyzer3 screens
Audio Spectrum Analyzer Pro4 screens

Verdict

The call

The clearest difference is price: Audio Spectrum Analyzer Pro at Free against Ultrasonic Analyzer's $19.99. Audio Spectrum Analyzer Pro also leads on rating (4.4 vs 3.9) and ratings volume (239 vs 35). Ultrasonic Analyzer's advantage is in-app purchases (none vs 2). On review sentiment, update cadence, ads and device support 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

Audio Spectrum Analyzer Pro is free to download; Ultrasonic Analyzer costs $19.99 up front. Audio Spectrum Analyzer Pro sells 2 in-app purchases, starting at $19.99 per year. Ultrasonic Analyzer asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Audio Spectrum Analyzer Pro holds the better App Store score, 4.4 against 3.9. That said, the two scores are not equally well evidenced: Audio Spectrum Analyzer Pro has 239 ratings behind it against 35, so its average is the more settled of the two. Written reviews point the same way: 56% of Ultrasonic Analyzer's written reviews are positive against 57% of Audio Spectrum Analyzer Pro's.

UpkeepUpdate frequency

Ultrasonic Analyzer ships an update every 4 months, Audio Spectrum Analyzer Pro every 7 months. Both last shipped on October 26, 2026.

Scorecard5 real differences · 5 level
Ultrasonic Analyzer versus Audio Spectrum Analyzer Pro: the parameters behind the verdict, then further details
ParameterUltrasonic AnalyzerAudio Spectrum Analyzer Pro
Price$19.99Free — better
Rating3.9 (35 ratings)4.4 (239 ratings) — better
Positive reviews55.9% of reviews57.4% of reviews — better
Number of ratings35239 — better
Update frequencyEvery 4 months — betterEvery 7 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.4 — better13.0
Further details — not scored
Size2 MB40 MB
Age rating4+4+
DeveloperDEXUS Pawel KrzywdzinskiVlad Polyanskiy

Customer experience

Ultrasonic Analyzer

All ratings35 ratings
Positive71.4%
Neutral5.7%
Negative22.9%
Written reviews34 reviews
Positive55.9%
Neutral5.9%
Negative38.2%

Audio Spectrum Analyzer Pro

All ratings238 ratings
Positive85.3%
Neutral4.6%
Negative10.1%
Written reviews183 reviews
Positive57.4%
Neutral7.1%
Negative35.5%

Bugs and requests

Ultrasonic Analyzer

Not enough reviews yet to summarise bugs or requests.

Audio Spectrum Analyzer Pro

Reported bugs

11 issues
  • App crashes on iOS 16 and iOS 26 launches
  • FFT resolution not working after iOS updates
  • Graph display freezes or becomes unresponsive
  • Spectrograph mode too slow on newer iPhones
  • Frequency alignment issues with dynamic display
Show 6 more
  • App won't uninstall properly
  • Malware warnings appearing
  • Help links and support pages broken/dead
  • Incorrect dB level readings (off by ~20dB)
  • Recording functions non-functional
  • Half black screen in certain orientations

Requested features

11 requests
  • Audio file upload capability
  • White noise/test signal generator
  • Microphone calibration file support
  • Recording functionality with timestamp
  • Multiple frequency cursors for comparison
Show 6 more
  • Ability to compare before/after curves
  • Adjustable dB level zoom/scaling
  • Saved settings and personalizations
  • Audio Unit (AUV3) plugin support
  • Peak hold reset button
  • Time-domain recording in spectrograph mode

In-app purchases

None

Ultrasonic Analyzer

No in-app purchases

2 purchases

Audio Spectrum Analyzer Pro

Subscriptions1
  • Premium Mode7 Days trial$19.991 Year
One-time1
  • Premium Pack$29.99

Questions

Is Ultrasonic Analyzer free?
Ultrasonic Analyzer costs $19.99, with no in-app purchases.
Is Audio Spectrum Analyzer Pro free?
Audio Spectrum Analyzer Pro is free to download, with in-app purchases available.
Which has better reviews, Ultrasonic Analyzer or Audio Spectrum Analyzer Pro?
Audio Spectrum Analyzer Pro is rated higher. Ultrasonic Analyzer averages 3.9 out of 5 from 35 ratings, while Audio Spectrum Analyzer Pro averages 4.4 from 239 ratings.
Do Ultrasonic Analyzer or Audio Spectrum Analyzer Pro have ads?
Neither Ultrasonic Analyzer nor Audio Spectrum Analyzer Pro shows ads.
Which is updated more often, Ultrasonic Analyzer or Audio Spectrum Analyzer Pro?
Ultrasonic Analyzer ships an update every 4 months, and Audio Spectrum Analyzer Pro every 7 months. Most recently, Ultrasonic Analyzer was updated on October 26, 2026 and Audio Spectrum Analyzer Pro on October 26, 2026.

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