Simple, high-quality software that never breaks your flow
About Us
What We Do
zelva plans, develops, and delivers software and web applications. In addition to our own products, we also offer consulting on software planning and development for creators and businesses.
Key Products
notave — a browser-based tool for creating clean, professional guitar TAB with minimal effort. accolva — a collaborative arranging tool for writing one band score together. Both are free to start and run entirely in the browser.
Development & Technical Management
We have translated business requirements into technical specifications and provided end-to-end support from architecture design to project management. We bring deep expertise in desktop application development with C++/Qt/JUCE and audio/media processing software, serving as a playing manager who resolves challenges on both technical and operational fronts.
We are not currently accepting new consulting inquiries. Any change will be announced on this page.
Products
notave is a simple, browser-based tool for creating professional-quality guitar TAB. TAB & standard notation, playback, print, and video export — no heavy software needed.
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accolva is a sheet music tool for writing one score as a band. Lay every part side by side, share it so each member fixes their own, play it back, and take it out as A4 sheets and MIDI.
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ARA Sleuth is a free, open-source debug tool for ARA2 plugin developers. Visualize ARA API call differences across DAWs in real time.
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Practice Guitar TAB Along With the Record — Play a YouTube Video or Audio File in Sync With the Sheet
Practicing TAB along with the original means juggling a video player and a tab app, and losing your place every time you want to hear a bar again. In notave you attach an audio file or a YouTube video to the sheet, and play, pause, bar skips and the loop all carry the record along. Anchoring takes one number — which second of the clip bar 1 falls on. Here is how to run a practice session on it, and how to check your part before shooting a play-through video.
Auto-Suggest Fingerings for Guitar TAB — Pick One and the Notes Fall Under Your Fingers
TAB converted from MIDI or sheet music, or typed in as it came, can have every note right and still be awkward under the fingers. In notave, right-click a bar and choose "Re-finger" — the pitches stay, only the strings and frets change. How to use the four candidates — keep position, low position, high position, fewest string crossings — and where this fits in practice and play-through videos.
MIDI and MusicXML into sheet music your band can share — settle it before the first rehearsal
A band's song usually lives in everyone's head in a slightly different version, and the differences surface while five people are standing in a room they are paying for by the hour. accolva turns the MIDI or MusicXML file you already have into one score in the browser, and shares it with a link. Everyone reads the same sheet and writes their feedback on the bar it belongs to, so the rehearsal can start from what you already agreed on. Nothing to install, free to start.
Tools
Free tools to support music practice and composition
Chord Sheet Maker
Build a song chord sheet, hear an acoustic-guitar backing, and see the chord fingerings. Print-ready.
Chord Beat Sequencer
A free browser sequencer that combines a chord progression, a drum pattern, and an auto-bass line. Share your loops by URL.
Guitar Chord Chart
Look up guitar chord fingerings with diagrams. Browse common chord shapes at a glance.
Guitar Scale Chart
Look up guitar scale positions with diagrams. View all 5 CAGED positions for major scales and more.
Circle of Fifths
An interactive circle of fifths & fourths. Explore key relationships, diatonic chords, and build progressions.
Metronome
A free online metronome with adjustable tempo and time signature.