In the open-source community, we share knowledge in ways that benefit everyone.

Linus Torvalds

We have always believed that both knowledge and experience should be shared for the benefit of humanity, and that open-source initiatives can create a better world. That is why we were the first in the industry to open-source the neck-joint technology developed by Kepma. We remain committed to crafting well-designed, high-quality instruments that deliver an exceptional experience to consumers.

Throughout life, we are constantly learning, absorbing new ideas, and making them our own. While establishing technological barriers is a standard practice in the business world, there exists a deeper, purer aspiration: to make the world a better place.

We, too, were once “helpless” beginners in the world of guitar—novices guarding a small patch of passion amidst a landscape dominated by experts, longing for the day we could play our own music. Yet, the journey is fraught with difficulty; the market is flooded with countless tutorials and apps, and one wrong turn can leave you bruised and battered. Some might argue that “an inability to distinguish useful information is a fault of one’s own,” but we wish to spread goodwill and help more people discover the joy that the guitar brings.

That is why we launched this initiative, releasing common music-learning tools directly online—free of charge, free of ads, and free of gimmicks—for the benefit of all music enthusiasts.

If you have any suggestions, please click the “Contact Us” button on the page; we look forward to hearing from you. We also hope that those who benefit will pay this kindness forward, helping to fill the world with goodness.

  • Kepma 多功能调音器（Tuner）1
    • Includes built-in tuning settings for various instruments, such as guitar, ukulele, bass, violin, cello, erhu, pipa, zhongruan, and liuqin.
    • Supports special guitar tunings.
    • Allows adjustment of the A4 reference frequency (defaulting to 440Hz) to accommodate classical tuning requirements.
    • Features a one-touch background noise suppression function, making it convenient to tune in noisy environments.
    • Includes a tolerance setting; the default threshold for “in-tune” status is within 8 cents (based on average human hearing perception), with the central circle turning green when the pitch is accurate.
    • Features a horizontal frequency display that maps the frequency positions of the six strings for clear, at-a-glance visualization; the current frequency is indicated in real-time along this axis, allowing for quick identification.
    • Includes a basic FFT function, suitable for tasks such as practicing vocal stability.
  • Kepma 多功能节拍器（Metronome）2
    • Adjustable BPM (tempo), time signature, and rhythm patterns.
    • Built-in “Tap” function allows for automatic tempo adjustment by tapping.
    • Built-in Swing function.
    • Includes a variety of beat sounds (woodblock, finger snap, drum kit, water drop, etc.).
    • Multiple interface color themes.
    • Individual beats can be configured as muted, accented (strong), weak, or secondary accented.
    • Intermittent muting can be set to practice internalizing the rhythm.
    • Custom sounds for accented, weak, and secondary accented beats can be created via live recording; import/export capabilities facilitate use across different devices or sharing with others.
    • Custom sounds for accented, weak, and secondary accented beats can be created by setting specific frequencies (avoiding ear fatigue caused by constant exposure to a single frequency).
    • Built-in visual flash function synchronized with the beat; includes adjustable latency settings to fine-tune the synchronization between light and sound based on the specific device used.
    • Individual volume control for every beat.
  • Kepma 和弦、琶音、音阶可视化（Chords, scales, arpeggios）3
    • Adjustments to tuning, timbre, and left/right-hand techniques allow users to influence all chords, modes, and more.
    • The chord library feature visualizes the positions and note names of chord tones on the fretboard based on a user-selected root note and chord type; a single chord can often be played using various fingerings.
    • An overview of common chords displays the constituent notes and provides audio previews based on the currently selected root note, helping users get a feel for the sound.
    • A reverse chord lookup function identifies the corresponding chord based on specific positions clicked on the fretboard.
    • Regarding chord progressions, the tool includes built-in sequences and allows users to create custom progressions and adjust the tempo to experience how the sequence sounds.
    • For modes and scales, the tool visualizes common patterns on the fretboard; users can select a root note to update the fretboard visualization accordingly.
    • Clicking any area on the fretboard visualization highlights the location and displays the note name, while a click also plays the corresponding pitch.
  • Kepma 视唱练耳工具（Hear hum practice）4
    • Free Practice: Provides a piano interface where users can click keys to explore pitches, or play intervals and chords to train their ear.
    • Pitch Recognition: The program plays a sound, and the user selects the corresponding pitch.
    • Interval Recognition: The program plays an interval, and the user selects the corresponding interval.
    • Chord Recognition: The program plays a chord, and the user selects the corresponding chord.
    • Arpeggio Recognition: The program plays an arpeggio, and the user selects the corresponding arpeggio/chord.
  • Kepma 吉他指板大师（GuitarfretMaster)5
    • Users can customize the tuning, with a visual fretboard that updates in real-time.
    • Users can customize multiple root notes, scales, and chords, displaying note names and scale degrees. They can toggle between left- and right-hand views to see a real-time, dynamic visualization of the fretboard, facilitating targeted practice and improving familiarity with the guitar fretboard.
    • Users can click on specific positions on the fretboard to play the corresponding notes.
  • Kepma 分脑练习工具（POLYRHYTHM TRAINER）6
    • Train your ability to multitask mentally by using your hands and feet to play different rhythms simultaneously.
  • Kepma 3D 吉他查看
    • View Kepma guitars (rotatable in 3D) under custom lighting conditions on any device.
  • MuseScore （目标是支持全球音乐人创作和分享他们的作品，同时让音乐学习变得有趣且人人易于接触。）7
    • A professional, free, and open-source music notation program that supports guitar tablature, chords, and lyrics—ideal for creating complete guitar scores for both vocal accompaniment and fingerstyle playing.
  • Kepma 和弦可视化8
    • Free and open-source chord visualization, supporting left and right hands as well as multiple fingering options.
  • Kepma 五度圈9
    • The ultimate map for understanding tonality, key signatures, chords, and modulation. Click any key on the circle to hear and see its scales and chords—transforming abstract music theory into tangible visuals.
  1. 2025-12-04 ↩︎
  2. 2025-12-04 ↩︎
  3. 2025-12-05 ↩︎
  4. 2025-12-06 ↩︎
  5. 2025-12-10 ↩︎
  6. 2025-12-10 ↩︎
  7. MuseScore ↩︎
  8. 2026-6-28 ↩︎
  9. 2026-6-29 ↩︎

其他有趣的小项目