Noise Spectrum Logger vs Stochastic Signal Processing
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Noise Spectrum Logger
Visualize sound frequencies in real-time with a dynamic spectrum display. Log and export audio data for analysis, with options for smoothing and background processing. Access all features offline.
- Real-time spectrum display (20-20000Hz)
- Zoomable spectrum view
- Maximum value highlighting
- Spectrum smoothing options (Mean/RMS)
- Logging and CSV export
- Background processing
- Offline functionality
Read full descriptionHide full description
1. DESPLAY The power spectrum of sound is displayed in the range of 20 - 20000Hz. You can zoom in/out the spectrum by pinching in/out smoothly. Also landscape orientation is supported. 2. USEFUL While "hold" switch is ON, the maximum values are displayed in red color. You can select "Mean" or "RMS" as the way of smoothing the spectrum out. 3. LOGGING By sliding "log" switch, the logging mode is started. To choose a past log from "History" tab, you can pull it from iPhone via email as a CSV file. The CSV file can be edited with Excel etc. 4. AVAILABLE Without cellular data service, the full functions are available. 5. BACKGROUND PROCESSING You can use the logging function even when iPhone in your pocket. 6. TECHNICAL NOTE Sample rate: 44.1kHz Bit depth: 32bit float FFT window function: Blackman FFT samples: 8192
Stochastic Signal Processing
Explore the processing of random signals like speech, music, and climate data. This interactive textbook offers dynamic information, films, animations, and 59 real-time laboratory experiments using your device's camera and microphone. It's designed for those with prior signal processing and probability theory knowledge.
- Interactive textbook format
- Dynamic information display
- Films and animations
- 59 laboratory experiments
- Real-time signal processing
- Homework problems
Read full descriptionHide full description
Speech, music, seismic vibrations, oil prices, and climate measurements are all examples of stochastic (random) signals. In this textbook—intended for individuals with prior training in introductory signal processing and introductory probability theory—we develop techniques to process such signals to extract useful information. We present case studies ranging from music to photographic images to oil prices to climate data to the motion of individual biomolecules. This textbook, as an interactive textbook ("iBook"), makes use of your device's ability to display dynamic information through films and animations and to hear the results of the techniques applied to music. At the end of every chapter there are homework problems ranging from easy to "olympic". We make use of your device's interactive capabilities to offer 59 laboratory experiments in signal processing. The experiments use the camera, the microphone, the speakers, and the graphical user interface. These experiments are not simulations; they are examples of real digital processing of signals in your device. In this time of at-home and online learning, this is the way to learn signal processing through study and experimentation.
Screenshots
Verdict
The clearest difference is in-app purchases: Stochastic Signal Processing at none against Noise Spectrum Logger's 1. Stochastic Signal Processing also leads on update cadence (every 5 weeks vs every 10 months) and ratings volume (6 vs 1). Noise Spectrum Logger's advantage is rating (5.0 vs 4.7). On price, ads, monetization model 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
Both are free to download. Noise Spectrum Logger sells 1 one-off in-app purchase. Stochastic Signal Processing asks for nothing beyond the download.
Noise Spectrum Logger holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Stochastic Signal Processing has 6 ratings behind it against 1, so its average is the more settled of the two.
Noise Spectrum Logger ships an update every 10 months, Stochastic Signal Processing every 5 weeks. The most recent releases landed on October 7, 2026 and October 24, 2026 respectively.
| Parameter | Noise Spectrum Logger | Stochastic Signal Processing |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 4.7 (6 ratings) |
| Positive reviews | — | 66.7% of reviews |
| Number of ratings | 1 | 6 — better |
| Update frequency | Every 10 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.5 | 15.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 73 MB |
| Age rating | 12+ | 4+ |
| Developer | Yukiko Iwai | Ian Young |
Customer experience
Noise Spectrum Logger
Stochastic Signal Processing
In-app purchases
Noise Spectrum Logger
- Remove Ads$3.99
Stochastic Signal Processing
No in-app purchases
Questions
Is Noise Spectrum Logger free?
Is Stochastic Signal Processing free?
Which has better reviews, Noise Spectrum Logger or Stochastic Signal Processing?
Do Noise Spectrum Logger or Stochastic Signal Processing have ads?
Which is updated more often, Noise Spectrum Logger or Stochastic Signal Processing?
Other comparisons
