# JTL WatchTuner

> JTL WatchTuner (iPhone/iPad app by Shan-Chun Hu.)

- Source: https://appshunter.io/ios/app/jtl-watchtuner/id6799163338 (this page in markdown: same URL + `.md`)
- Developer: [Shan-Chun Hu](https://appshunter.io/developer/6773007974)
- Category: Music, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Released: 2026-08-13
- Data updated: 2026-08-27
- User reviews in markdown: https://appshunter.io/ios/app/jtl-watchtuner/id6799163338/reviews.md

## What is JTL WatchTuner?

Apple Watch 上，終於有一款真的能用的調音器。

不用掏手機、不用開 App、不用連 Wi-Fi——抬起手腕，對著樂器彈一個音，JTL WatchTuner 就開始告訴你準不準。調準的瞬間，手腕會震動回饋，眼睛不用一直盯著螢幕。

【三個理由，值得放在錶面上】

• 免 iPhone・免網路
獨立的 Apple Watch App，不需要先裝 iPhone 版、不需要連線，裝在手錶上就能直接用。

• 不耗電
調音是「進來、調完、離開」的短時間動作，不會常駐背景收音、不會拖垮電池續航。

• 抬腕即調
雙手都在琴上時，掏手機、放譜架都麻煩。手錶就戴在手腕上，抬手就看得到，離樂器很近。

【調準了，手腕會告訴你】
JTL WatchTuner 的核心體驗不是「看」，是「感覺」。調準的瞬間，Apple Watch 的觸覺回饋（Haptics）會震動提醒你——不用死盯著螢幕，眼睛可以留給樂譜和琴弦。

【任何樂器都能調——12 平均律 通用模式】
JTL WatchTuner 不綁定單一樂器。核心的「12 平均律 通用」模式偵測任意音高，吉他、烏克麗麗、小提琴、中提琴、大提琴、二胡，甚至人聲哼唱，只要落在十二平均律範圍內都能顯示音名與偏差 cents 值。

【A4 校準 435–445Hz，完全免費】
設定頁可自由調整 A4 基準頻率（435–445Hz，預設 440Hz）。慣用 442Hz 的小提琴演奏者也能直接對應，這項校準功能在 JTL WatchTuner 完全免費開放，不是付費限定項目。

【你的琴聲，只屬於你的手腕】
麥克風收音只在裝置本地即時分析，判斷完就捨棄，不錄音、不落地、不上傳。JTL WatchTuner 沒有帳號系統、沒有廣告、沒有第三方追蹤 SDK——我們不收集你的任何資料。

【簡單，是刻意的設計】
打開 App 就開始收音，不需要按開始鍵。沒有聲音持續 2 秒，畫面自動歸零等待下一個音。深色錶面搭配清楚的弧形指針與大字音名，在排練室、舞台側、安靜的房間裡都看得清楚。

—

JTL WatchTuner is a real, usable tuner for Apple Watch — no iPhone required, no internet needed. Raise your wrist, play a note, and see the pitch instantly. When you're in tune, your wrist buzzes to tell you — no need to stare at the screen.

Three reasons it belongs on your wrist: it works standalone without an iPhone companion app or Wi-Fi; tuning is a short, occasional task, so it won't drain your battery; and it's right there on your wrist while your hands stay on the instrument.

The chromatic 12-TET Universal mode detects any pitch, so it works for guitar, ukulele, violin, viola, cello, or your voice. A4 calibration (435–445Hz, default 440Hz) is free — handy for violinists who tune to 442Hz.

Your privacy: audio is analyzed on-device only, in real time, and never recorded, stored, or uploaded. No account, no ads, no third-party trackers.


## Version history (last 1 release)

### 0.1 — 2026-08-13

No release notes.

## More apps by Shan-Chun Hu

- [JTL調音器 節拍器](https://appshunter.io/ios/app/jtl/id6773007972)
- [JTL 吉他烏克麗麗和弦表速查版](https://appshunter.io/ios/app/jtl/id6773586890)
- [JTL我的音域](https://appshunter.io/ios/app/jtl/id6773674593)
- [JTL吉他自學第一步](https://appshunter.io/ios/app/jtl/id6773781080)
- [JTL股息管家婆婆](https://appshunter.io/ios/app/jtl/id6774231494)
- [JTL移調夾助手 轉調盤工具 自彈唱必備工具](https://appshunter.io/ios/app/jtl/id6778086444)

All apps by Shan-Chun Hu: https://appshunter.io/developer/6773007974

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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 2026-08-27.*