# Sino — Audio test signal generator

> Audio test signal generator (iPhone/iPad app by Benjamin Graf.)

- Source: https://appshunter.io/ios/app/sino/id1545255556 (this page in markdown: same URL + `.md`)
- Developer: [Benjamin Graf](https://appshunter.io/developer/1545255558)
- Category: Utilities, Music
- Price: $0.99
- Age rating: 4+
- Requires: iOS 14.2 · 4 MB
- Languages: English
- Released: 2020-12-20
- Data updated: 2025-12-21
- User reviews in markdown: https://appshunter.io/ios/app/sino/id1545255556/reviews.md

## What is Sino?

Sino is a simple test tone generator. Use it to test your speakers, headphones, studio monitors or PA system. In portrait mode, use one big dial to slide through the whole audible frequency spectrum single-handedly. In landscape mode, two sliders for frequency and amplitude control make it easy to swipe with more precision. Choose between a sine oscillator and band filtered pink noise. Send the signal to the left, right or both channels of your stereo setup.

With its precise frequency slider, you can find problematic frequencies in your room easily.


## Version history (last 2 releases)

### 1.1.0 — 2024-02-05

Sino v1.1 introduces one-handed portrait mode and fixes optical issues in dark mode. Sino also now shows note names for better orientation in the spectrum.

### 1.0.3 — 2020-12-20

No release notes.

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## More apps by Benjamin Graf

- [14 28](https://appshunter.io/ios/app/14-28/id6447632255)

All apps by Benjamin Graf: https://appshunter.io/developer/1545255558

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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 2025-12-21.*