# VoicePrinter > Real-time audio analysis and visualization tool for various sound sources. (iPhone/iPad app by HIROFUMI MARUO.) - Source: https://appshunter.io/ios/app/voiceprinter/id1180382943 (this page in markdown: same URL + `.md`) - Developer: [HIROFUMI MARUO](https://appshunter.io/developer/667820705) - Category: Utilities, Lifestyle - Price: Free with in-app purchases - Rating: 4.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 15.0 · 5 MB - Languages: American English, Japanese - Released: 2017-07-31 - Data updated: 2026-08-28 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/voiceprinter/id1180382943/reviews.md ## What is VoicePrinter? 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. ******* ## Key features - Real-time sound visualization - Human voice analysis - Environmental sound analysis - Music analysis - Recording and playback - Import/export audio files ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Premium Functions | $0.99 | one-time | ## Frequently asked questions about VoicePrinter ### What can VoicePrinter be used for? VoicePrinter can be used for analyzing human voices, environmental sounds, music, and more. It displays sound decomposed into two dimensions continuously over time. ### Does VoicePrinter have ads? Yes, VoicePrinter contains advertisements. However, banners are not displayed when using the premium version features unlocked via in-app purchase. ### What are the technical specifications for audio analysis in VoicePrinter? VoicePrinter supports sampling rates from 10000 to 44100 Hz and displays a maximum frequency from 1000 to 22050 Hz. The display time range is 2 to 10 seconds. ### What features are available with the in-app purchase in VoicePrinter? The in-app purchase in VoicePrinter unlocks recording, playback, import of external sound source files, and external output. These premium features enhance the app's functionality for audio manipulation. ### What file formats can VoicePrinter import and export? VoicePrinter imports 16-bit linear PCM mono audio sources and outputs as 16-bit linear PCM mono. If the input is stereo, only the first channel (1ch) is imported. ### How does VoicePrinter handle iCloud Drive integration? To input and output data to iCloud Drive with VoicePrinter, you must enable iCloud Drive in your System Preferences. This allows for seamless file management with the cloud service. ### What is the update frequency of VoicePrinter? VoicePrinter was last updated on April 14, 2025, with version 1.2. This indicates regular updates to improve functionality and address issues. ### What is the user rating for VoicePrinter? VoicePrinter has a user rating of 4.0 stars based on 1 rating. This suggests a generally positive reception from its current user base. ## Version history (last 3 releases) ### 1.2 — 2025-04-14 Added a sample video of premium features. ### 1.1 — 2025-03-21 - Recording, playback, import, and export functions based on audio and voiceprints can now be used with an in-app purchase. In this case, the banner will not be displayed. - Improved the smoothness of audioprint display. ### 1.0 — 2017-07-31 This app has been updated by Apple to display the Apple Watch app icon. ## Apps similar to VoicePrinter | App | Rating | Price | Category | | --- | --- | --- | --- | | [EyeSound Vocal](https://appshunter.io/ios/app/eyesound-vocal/id6476980675) | — | Free | Utilities | | [RotON](https://appshunter.io/ios/app/roton/id6754537065) | — | Free | Utilities | | [FormantScope](https://appshunter.io/ios/app/formantscope/id6764803567) | — | Free | Utilities | | [コレクション](https://appshunter.io/ios/app/id6752537785) | — | Free | Utilities | | [Linmore LED UltraLink](https://appshunter.io/ios/app/linmore-led-ultralink/id1463393787) | 4.0 (4) | Free | Utilities | | [TONE Telegenics](https://appshunter.io/ios/app/tone-telegenics/id6476420592) | 5.0 (2) | Free | Utilities | ## More apps by HIROFUMI MARUO - [SoundWatch](https://appshunter.io/ios/app/soundwatch/id688680039) - [SuperSWD](https://appshunter.io/ios/app/superswd/id760491884) - [SWDMailer](https://appshunter.io/ios/app/swdmailer/id779421888) - [DrvRec](https://appshunter.io/ios/app/drvrec/id809321587) - [HoldBaby](https://appshunter.io/ios/app/holdbaby/id821304732) - [e-Nurse](https://appshunter.io/ios/app/e-nurse/id838752553) All apps by HIROFUMI MARUO: https://appshunter.io/developer/667820705 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-28.*