一位开发者因对现有唱歌应用的歌曲库质量不满，自行开发了OnKey应用来解决这一问题1。OnKey是一款免费开源的Mac应用，能够学习歌曲的音高信息，并在用户唱歌时进行实时音高评分和反馈1。该应用支持Spotify、Apple Music和YouTube作为音源输入1。
OnKey采用MIT开源协议发布1，目前仅限Apple Silicon Mac（M1及更新版本）且系统版本须为macOS 14.2及以上1。应用不保存音乐和用户声音，仅发送歌曲指纹用于识别和歌词查询1。开发者利用Claude Code生成初始代码1，学习歌曲耗时数分钟，之后用户便可使用音高轨道进行练习1。
A developer frustrated by declining song libraries in existing singing applications has created OnKey, a free, open-source Mac app designed to provide real-time pitch feedback while singing 1. The application learns a song's pitch information and scores the user's vocal performance, helping identify where they sing off-key 1.
OnKey integrates with three major music streaming platforms: Spotify, Apple Music, and YouTube 1. The app requires Apple Silicon Macs (M1 or newer) running macOS 14.2 or later 1. To protect user privacy, the application does not store music or voice recordings; it only sends song fingerprints for identification and lyric retrieval 1. The developer used Claude Code to generate the initial codebase 1.
The software is available under the MIT open-source license at no cost 1. Once a song is learned—a process taking several minutes—users can practice with its pitch track 1.
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