🎸 在线调音器（吉他 / 尤克里里 / 贝斯）Online Guitar Tuner (Ukulele, Bass, Violin)
免费在线调音器：用麦克风听音，实时显示音名、频率和偏差音分，指针进入绿色区域就调准了。支持吉他标准音 EADGBE、尤克里里 GCEA、贝斯、小提琴和半音阶模式，可调 A4 基准频率，还能播放标准音对比。Free online tuner: it listens through your microphone and shows the note, frequency and cents off; bring the needle into the green zone. Guitar standard EADGBE, ukulele GCEA, bass, violin and chromatic modes, adjustable A4 reference, and reference tones to tune by ear.
点击上面的琴弦按钮可以播放标准音，用耳朵对比。麦克风声音只在本机分析，不会录音或上传。Tap a string button to hear its reference tone. Microphone audio is analysed on this device only — nothing is recorded or uploaded.
使用说明与常见问题How-to & FAQ
「在线调音器（吉他 / 尤克里里 / 贝斯）」是什么？What is the Online Guitar Tuner (Ukulele, Bass, Violin)?
免费在线调音器：用麦克风听音，实时显示音名、频率和偏差音分，指针进入绿色区域就调准了。支持吉他标准音 EADGBE、尤克里里 GCEA、贝斯、小提琴和半音阶模式，可调 A4 基准频率，还能播放标准音对比。Free online tuner: it listens through your microphone and shows the note, frequency and cents off; bring the needle into the green zone. Guitar standard EADGBE, ukulele GCEA, bass, violin and chromatic modes, adjustable A4 reference, and reference tones to tune by ear.
如何使用「在线调音器（吉他 / 尤克里里 / 贝斯）」？How do I use the Online Guitar Tuner (Ukulele, Bass, Violin)?
选择乐器，点“开始调音”并允许使用麦克风。一次弹一根弦，屏幕会显示最接近的那根弦：指针在左边（偏低）就把弦拧紧，在右边（偏高）就放松，直到显示“音准了”。Choose your instrument, press Start and allow the microphone. Pluck one string at a time; the nearest string is shown. If the needle is left (flat) tighten the string, if right (sharp) loosen it, until it says In tune.
吉他标准音是哪几个音？What are the standard guitar tuning notes?
六弦到一弦依次是 E2、A2、D3、G3、B3、E4（频率约 82.4、110、146.8、196、246.9、329.6 Hz），也就是常说的 EADGBE。尤克里里从四弦到一弦是 G4、C4、E4、A4。From the 6th to the 1st string: E2, A2, D3, G3, B3, E4 (about 82.4, 110, 146.8, 196, 246.9 and 329.6 Hz) — EADGBE. A ukulele, 4th to 1st string, is G4, C4, E4, A4.
指针跳来跳去怎么办？The needle keeps jumping — what can I do?
让手机靠近音孔或琴头，在安静的环境里只弹一根弦，并让它自然延音。刚拨弦的瞬间音高不稳定，等一秒再看读数。电吉他可以把音量开大一点再靠近音箱。Hold the device near the sound hole or headstock in a quiet room, pluck a single string and let it ring. Pitch is unstable right after plucking, so read after a second. For electric guitar, turn the amp up and hold the device near it.
手机怎么给吉他、尤克里里等乐器调音？How do I tune a guitar, ukulele or other instrument with my phone?
可以。打开本页面就是一个免费的手机调音表：吉他调弦、尤克里里定弦、贝斯校音都能用，不用下载调音软件。新换琴弦会慢慢跑音，弹几分钟后再校一次音准即可。Yes. This page works as a free phone tuner for guitar, ukulele and bass with no app to install. New strings drift for a while, so re-check the tuning after a few minutes of playing.
偏差多少音分算调准？How many cents off counts as in tune?
100 音分等于一个半音。±5 音分以内大多数人已经听不出区别，本工具在这个范围内显示绿色“音准了”。100 cents is one semitone. Within ±5 cents most people cannot hear a difference, so the tool shows green In tune in that range.
「在线调音器（吉他 / 尤克里里 / 贝斯）」免费吗？文件会上传吗？Is the Online Guitar Tuner (Ukulele, Bass, Violin) free? Are my files uploaded?
「在线调音器（吉他 / 尤克里里 / 贝斯）」完全免费，无需注册。麦克风声音只在本机实时分析，不录音、不保存、不上传，点“停止”或关闭页面后立即释放麦克风。The Online Guitar Tuner (Ukulele, Bass, Violin) is free with no sign-up. Microphone sound is analysed live on your device only — never recorded, stored or uploaded — and the microphone is released when you press Stop or close the page.