VoicePrinter vs RST Scope
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
VoicePrinter
Analyze sound and voice in real-time with detailed visual representations. Explore human voices, environmental sounds, music, and more. Offers recording, playback, and import/export features with a premium upgrade.
- Real-time sound visualization
- Human voice analysis
- Environmental sound analysis
- Music analysis
- Recording and playback
- Import/export audio files
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Sound is decomposed into two dimensions and displayed continuously over time. The premium version offers a new style of audio recorder/player. This app can be used for analysis of Human voice, Environmental sound, Sound of animals, musics, etc. The specifications are as follows. Sampling rate = 10000 to 44100 Hz Display maximum frequency = 1000 to 22050 Hz Display time range = 2 to 10 seconds Frequency axis display resolution = 100 Time axis display resolution = 10 / sec From version 1.1, recording, playback, import, and export functions based on sound and voiceprints can be used by in-app purchase. In this case, banners will not be displayed. The premium version allows recording, playback, import of external sound source files, and external output. ・Record under the following conditions Sampling frequency = 10000~44100Hz ・Display audio analysis results under the following conditions (audio is played in sync with the analysis screen) Maximum display frequency (high-pitched display frequency limit) = 1000~22050Hz (half the sampling frequency or less) Display time range (time that can be displayed on one screen) = 2~10 seconds Frequency display resolution (frequency axis: number of data displayed on the vertical axis) = 200 points Time axis display resolution (time axis: display interval (pitch) on the horizontal axis) = 50~200ms (10~200 points) ・Importing external audio source files Imports 16-bit linear PCM mono audio sources. (In the case of stereo, only 1ch is imported.) ・External output Outputs as 16-bit linear PCM mono. *To input and output data to iCloud Drive, you must enable iCloud Drive in System Preferences. *******
RST Scope
This utility app provides spectrum scope and waterfall displays for amateur radio operators. It enhances radios lacking these features by analyzing microphone input, allowing for clear distinction of Morse code and detailed audio frequency visualization.
- Spectrum scope and waterfall display
- Morse code distinction via FFT
- Adjustable waterfall speed
- Adjustable audio input level
- Switchable display band (wide/narrow)
- Display pause function
- Recording and playback of input sound
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This is an app for amateur radio operators with a narrow band of audio frequency, spectrum scope & waterfall display. You can get a rich display by microphone inputting the speaker output of a radio that does not have a spectrum scope or waterfall function. The FFT allows you to distinguish between the dot and dash of Morse code. [function] 1. Ability to change the speed of the waterfall 2. Ability to adjust the level of audio input 3. Function to switch the display band between wide and narrow 4. Display pause function (pause / cancel by touching the screen) 5. Function to switch the cross hatch ON / OFF by longTap 6. Frequency resolution is fixed at 40Hz. 7. Function to switch the USB/LSB by Left/Right Swipe 8.Recording/Playback function of Input Sound RST Scope(Free) https://www.youtube.com/watch?v=1s9RvOFp52g
Screenshots
Verdict
The clearest difference is rating: RST Scope at 5.0 against VoicePrinter's 4.0. RST Scope also leads on in-app purchases (none vs 1) and update cadence (every 3 days vs every 47 months). On price, ratings volume, 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
Both are free to download. VoicePrinter sells 1 one-off in-app purchase. RST Scope asks for nothing beyond the download.
RST Scope holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
VoicePrinter ships an update every 47 months, RST Scope every 3 days. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.
| Parameter | VoicePrinter | RST Scope |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (1 ratings) | 5.0 (1 ratings) — better |
| Number of ratings | 1 | 1 |
| Update frequency | Every 47 months | Every 3 days — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Ad-supported — better |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 15.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 5 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | HIROFUMI MARUO | koji kamogawa |
Customer experience
VoicePrinter
RST Scope
In-app purchases
VoicePrinter
- Premium Functions$0.99
RST Scope
No in-app purchases
