# Voice Stability Test > Measures voice jitter and shimmer for vocal quality analysis. (iPhone/iPad app by Hyunmin Park.) - Source: https://appshunter.io/ios/app/voice-stability-test/id1056651980 (this page in markdown: same URL + `.md`) - Developer: [Hyunmin Park](https://appshunter.io/developer/445270554) - Category: Health & Fitness, Productivity - Price: Free - Rating: 2.50/5 from 2 App Store ratings · 3 written reviews indexed - Age rating: 4+ - Requires: iOS 9.0 · 7 MB - Languages: American English, Japanese, Korean, Chinese (Simplified, China), Chinese (Traditional, Taiwan) - Released: 2015-11-13 - Data updated: 2026-06-21 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/voice-stability-test/id1056651980/reviews.md ## What is Voice Stability Test? This test can check your voice quality by variations of frequency (Jitter). Jitter and shimmer are measures of the cycle-to-cycle variations of frequency and amplitude, respectively, which have been largely used for the description of pathological voice quality. Higher jitter levels suggest that something is interfering with normal vocal fold vibration and the mucosal wave. Whereas jitter is a measure of the percentage irregularity in the pitch of the vocal note, shimmer is a measure of the percentage irregularity in the amplitude of the vocal note. ## Key features - Measures voice jitter - Measures voice shimmer - Analyzes vocal fold vibration - Assesses voice quality ## Recent user reviews (3 of 3) All indexed reviews: https://appshunter.io/ios/app/voice-stability-test/id1056651980/reviews.md ### 3/5 — Meh *2026-03-01* It takes a lot of ties to get your result and is not that easy ### 4/5 — Great! *2018-04-29* This app is easy to use and figure out. It tells you what to do for easy instruction. Also gives the results immediately ### 1/5 — Potentially good, but it's a work in progress *2016-06-20* When it asks to say a vowel, should it be long or short? Why are you asking for name and age? What does "jitter" mean? show me a picture of jitter vs. no jitter. I can't analyze the spectral result so why display it? The help just labels the controls. There is no explanation of what this app is or does. ## Frequently asked questions about Voice Stability Test ### What does Voice Stability Test measure? Voice Stability Test measures jitter and shimmer, which are indicators of cycle-to-cycle variations in voice frequency and amplitude. These measurements help assess the quality and stability of your voice. ### How does Voice Stability Test help with voice quality? By quantifying jitter and shimmer, the app provides objective data on irregularities in vocal fold vibration. Higher levels of jitter can suggest interference with normal vocal cord function. ### Is Voice Stability Test available on Android? Based on the provided information, Voice Stability Test is available for iPhone and iPod. Compatibility with Android devices is not specified. ### What is the rating for Voice Stability Test? Voice Stability Test has a rating of 2.5 stars based on 2 user ratings. This suggests a mixed user reception. ### When was Voice Stability Test last updated? Voice Stability Test was last updated on November 13, 2015, with version 1.0. This indicates it has not received updates in a significant period. ### Is Voice Stability Test free to use? Yes, Voice Stability Test is available for free. There are no in-app purchases or subscription fees associated with its use. ### What is the age rating for Voice Stability Test? Voice Stability Test has an age rating of 4+. This means it is considered suitable for users aged 4 and above. ### Does Voice Stability Test have ads? No, Voice Stability Test does not contain advertisements. It is a completely ad-free application. ## Version history (last 1 release) ### 1.0 — 2015-11-13 This app has been updated by Apple to display the Apple Watch app icon. ## Apps similar to Voice Stability Test | App | Rating | Price | Category | | --- | --- | --- | --- | | [Loud and Clear](https://appshunter.io/ios/app/loud-and-clear/id1491171131) | 4.3 (47) | Free | Health & Fitness | | [Vocal Pitch Monitor-Voice Whiz](https://appshunter.io/ios/app/vocal-pitch-monitor-voice-whiz/id1579828873) | 4.3 (944) | Free | Health & Fitness | ## More apps by Hyunmin Park - [Compare your fortune with friends by High&Low Card Game](https://appshunter.io/ios/app/compare-your-fortune-with-friends-by-high-and-low-card-game/id451938616) - [Betting Golf Score IAP with Voice](https://appshunter.io/ios/app/betting-golf-score-iap-with-voice/id459391437) - [High & Low - Who better luck going](https://appshunter.io/ios/app/high-and-low-who-better-luck-going/id460008576) - [Money Note with FingerID](https://appshunter.io/ios/app/money-note-with-fingerid/id559995981) - [Draw Man All New HD](https://appshunter.io/ios/app/draw-man-all-new-hd/id564675912) - [Draw Man All New](https://appshunter.io/ios/app/draw-man-all-new/id566205916) All apps by Hyunmin Park: https://appshunter.io/developer/445270554 ## Related topics [jitter](https://appshunter.io/ios/topics/jitter) --- *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 2026-06-21.*