# SVV — Subjective Visual Vertical

> Measures perceived verticality to assess vestibular function. (iPhone/iPad app by Kuroda ENT Clinic.)

- Source: https://appshunter.io/ios/app/svv/id1471979816 (this page in markdown: same URL + `.md`)
- Developer: [Kuroda ENT Clinic](https://appshunter.io/developer/1369699677)
- Category: Medical
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 2 MB
- Languages: American English, Japanese
- Released: 2019-07-13
- Data updated: 2026-09-07
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/svv/id1471979816/reviews.md

## What is SVV?

Subjective Visual Vertical (SVV) is a test that measures the difference between a person’s perceived vertical and the true vertical. It evaluates gravity perception mediated by the otolith organs, vestibular nerve, and central vestibular pathways, and helps detect asymmetry of vestibular function.
Using an audio/video remote control or a variety of game controllers, including those for Nintendo Switch, PlayStation, and Xbox, the user adjusts a displayed line until it is perceived as perfectly vertical. After repeating this procedure 10 times, the application calculates the mean deviation from the true vertical and the standard deviation.

## Key features

- Measures subjective visual vertical
- Evaluates gravity perception
- Detects vestibular asymmetry
- Adjusts perceived vertical line
- Calculates mean deviation and standard deviation
- Supports remote and game controllers

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/svv/id1471979816/reviews.md

### 3/5 — アップデートありがとうございます

*2025-03-22*

アップデートされ、測定可能となりました！
しかし、なぜか回転するバーの色が赤でなくグレーとなっています。そのため、仕方なく古いバージョンのままの端末を使っています。
研究に使わせていただいています。さらなる修正をお願いいたします。

**Developer response:** 前後に５度以上傾くと警告音を鳴らし決定不能としていました。警告音に加えて、垂直線を灰色に変化させ、消音の状態でも傾きすぎがわかる様にしました。

## Frequently asked questions about SVV

### What is SVV used for?

SVV is used to measure the difference between your perceived vertical and the true vertical. This helps evaluate gravity perception mediated by the otolith organs and vestibular pathways, and can detect asymmetry in vestibular function.

### How does SVV work?

You use an audio/video remote control or a game controller to adjust a displayed line until it appears perfectly vertical. The app repeats this 10 times to calculate your mean deviation and standard deviation from the true vertical.

### Is SVV free to use?

Yes, SVV is available for free. There are no in-app purchases or advertisements associated with its use.

### What devices support SVV?

SVV is supported on iPhone, iPad, and iPod devices. It is designed for Apple's iOS ecosystem.

### What is the age rating for SVV?

SVV has an age rating of 4+, making it suitable for a wide range of users. This indicates it contains no mature content.

### How often is SVV updated?

The latest version of SVV is 3.4, and it was last updated on September 7, 2026. This suggests a relatively active development cycle for the application.

### Can I use a game controller with SVV?

Yes, SVV supports a variety of game controllers, including those for Nintendo Switch, PlayStation, and Xbox, in addition to audio/video remote controls.

### Who developed SVV?

SVV was developed by Kuroda ENT Clinic, a developer focused on medical applications.

## Version history (last 5 releases)

### 3.4 — 2026-09-07

The rotation angle for screen taps, MFi controllers, and the Elecom remote control, which previously differed, has been standardized to 0.25 degrees per operation.

### 3.3 — 2026-08-09

Added a sensor accuracy check page and updated the help page.

### 3.2 — 2026-07-08

The SVV result display previously calculated the mean and population standard deviation, but it has been changed to calculate the mean and unbiased standard deviation.

### 3.1 — 2026-06-29

I updated the Help page to indicate that PlayStation and Xbox controllers are also supported.

### 3.0 — 2026-06-26

Added support for MFi controllers and Nintendo Switch controllers.

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## More apps by Kuroda ENT Clinic

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All apps by Kuroda ENT Clinic: https://appshunter.io/developer/1369699677

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*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 2026-09-07.*