Voice Spectrogram Logger vs Morse Code
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
Morse Code
Learn and master Morse code with this app. It features AI-powered audio decoding, interactive practice games, and a comprehensive code table. Customize your learning experience and track your progress.
- AI audio decoding
- Practice games
- Morse code table
- Bidirectional translation
- Customizable settings
- Progress tracking
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Morse Master helps you learn Morse code by ear with a structured Koch-method path and practical CW drills. Instead of memorizing dots and dashes from a chart, you train the sound patterns used in real copying and sending. Training: - Progressive Koch lessons that introduce characters step by step - Daily Sprint sessions for focused 3–5 minute practice - Listening and receive drills for Morse copy - Sending practice for rhythm, timing, and keying control - Weak-character review and confusing-pair drills - Adjustable WPM, Farnsworth spacing, pitch, noise, and fading - WPM Ladder, Free Range, and copy practice for extra reps Signal tools: - Text to Morse and Morse to text conversion - On-device audio decoding from recordings or microphone input - Flashlight Morse transmitter - Training history, progress, badges, and weak-character review Morse Master works offline and does not require an account. It is built for beginners, ham radio learners, and CW operators who want a clear daily path from first sounds to steadier copy and sending. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://morsecodetrainer.vercel.app/privacy
Screenshots
Verdict
The clearest difference is review sentiment: Morse Code at 67% against Voice Spectrogram Logger's 0%. Morse Code also leads on rating (4.6 vs 1.0) and update cadence (every 5 days vs every 15 months). Voice Spectrogram Logger's advantage is monetization model (free vs free with in-app purchases). On price, ads, in-app purchases and iOS requirement 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 and Morse Code sells 4 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.
Morse Code holds the better App Store score, 4.6 against 1.0. That said, the two scores are not equally well evidenced: Morse Code has 237 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 67% of Morse Code's.
Voice Spectrogram Logger ships an update every 15 months, Morse Code every 5 days. The most recent releases landed on July 29, 2026 and September 23, 2026 respectively.
| Parameter | Voice Spectrogram Logger | Morse Code |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) | 4.6 (237 ratings) — better |
| Positive reviews | 0.0% of reviews | 66.7% of reviews — better |
| Number of ratings | 1 | 237 — better |
| Update frequency | Every 15 months | Every 5 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac, Apple Watch — better |
| Requires iOS | 15.5 | 15.0 — better |
| Further details — not scored | ||
| Size | 7 MB | 45 MB |
| Age rating | 12+ | 4+ |
| Developer | Yukiko Iwai | 亚娟 秦 |
Customer experience
Voice Spectrogram Logger
Morse Code
In-app purchases
Voice Spectrogram Logger
- Remove Ads$3.99
Morse Code
- Morse Master PRO Monthly$0.991 Month
- Morse Master PRO Annual$2.991 Year
- Unlock full version$0.99
- Morse Master PRO Lifetime$3.99
Questions
Is Voice Spectrogram Logger free?
Is Morse Code free?
Which has better reviews, Voice Spectrogram Logger or Morse Code?
Do Voice Spectrogram Logger or Morse Code have ads?
Which is updated more often, Voice Spectrogram Logger or Morse Code?
Other comparisons
