Voice Spectrogram Logger vs Vernier Spectral Analysis
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Voice Spectrogram Logger
Visualize voice frequencies in a spectrogram from 20-2500Hz. Adjust display with sliders and log recordings to export as PNG files. Functions fully offline and supports background processing.
- Real-time voice spectrogram display
- Adjustable frequency range (20-2500Hz)
- Zoomable spectrogram with pinch gestures
- Customizable spectrogram gradation
- Logging mode with history export
- Offline functionality
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1. DESPLAY The spectrogram of voice is displayed in the range of 20 - 2500Hz. You can zoom in/out the spectrogram by pinching in/out smoothly. Also landscape orientation is supported. 2. USEFUL By moving "vivid" slider, the gradation of spectrogram is controlled. The gradation is also controlled by moving "baseline" slider in "Setting" tab and selecting "Mean" or "RMS" as the way of smoothing the spectrogram out. 3. LOGGING When "log" switch is ON, this app runs in the logging mode. To choose a past log from "History" tab, you can pull it from iPhone via email as a PNG file. 4. AVAILABLE Without cellular data service, the full functions are available. The background processing is supported. 5. TECHNICAL NOTE Sample rate: 44.1kHz Bit depth: 32bit float FFT window function: Blackman FFT samples: 4096
Vernier Spectral Analysis
This free app enables students to perform spectral analysis in biology and chemistry labs. It facilitates data collection and analysis for topics like Beer's Law and enzyme kinetics. The user-friendly interface guides students through the process, offering features like curve fitting.
- Full spectrum data collection
- Beer's Law exploration
- Enzyme kinetics analysis
- Plant pigment studies
- Curve fitting
- Data interpolation
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Our free Spectral Analysis app makes it easy to incorporate spectroscopy into your biology and chemistry labs. Using the app, students can collect a full spectrum and explore topics such as Beer’s law, enzyme kinetics, and plant pigments. The user-friendly interface walks the students through the data-collection process and includes analysis features such as curve fitting and data interpolation.
Screenshots
Verdict
The clearest difference is rating: Vernier Spectral Analysis at 2.2 against Voice Spectrogram Logger's 1.0. Vernier Spectral Analysis also leads on in-app purchases (none vs 1) and ratings volume (61 vs 1). On price, update cadence, ads 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
Both are free to download. Voice Spectrogram Logger sells 1 one-off in-app purchase. Vernier Spectral Analysis asks for nothing beyond the download.
Vernier Spectral Analysis holds the better App Store score, 2.2 against 1.0. That said, the two scores are not equally well evidenced: Vernier Spectral Analysis has 61 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 0% of Voice Spectrogram Logger's written reviews are positive against 21% of Vernier Spectral Analysis's.
Voice Spectrogram Logger ships an update every 15 months, Vernier Spectral Analysis every 8 months. The most recent releases landed on July 29, 2026 and August 21, 2026 respectively.
| Parameter | Voice Spectrogram Logger | Vernier Spectral Analysis |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) | 2.2 (61 ratings) — better |
| Positive reviews | 0.0% of reviews | 21.1% of reviews — better |
| Number of ratings | 1 | 61 — better |
| Update frequency | Every 15 months | Every 8 months — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.5 — better | 16.7.8 |
| Further details — not scored | ||
| Size | 7 MB | 38 MB |
| Age rating | 12+ | 4+ |
| Developer | Yukiko Iwai | Vernier Software & Technology |
Customer experience
Voice Spectrogram Logger
Vernier Spectral Analysis
In-app purchases
Voice Spectrogram Logger
- Remove Ads$3.99
Vernier Spectral Analysis
No in-app purchases
Questions
Is Voice Spectrogram Logger free?
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