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 have a free plan and run entirely in the browser.
Development & Technical Management
We translate business requirements into technical specifications and provide 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.
Contact usProducts
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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accolva Manual — Full Feature Reference
Reference manual for accolva, the browser-based band score editor for writing and co-editing with your band. Covers the song list, structure and chord progressions, the per-part input pads (keyboard, piano roll, TAB, drums), auto-fill drafts from chords, playback and the mixer, comments and notifications, A4 printing and MIDI export, and the full keyboard shortcut list.
Loop-practice a chord progression with a backing band — build your own practice track in the browser
Practicing to a bare metronome rarely sticks. This article shows a practice workflow where notave adds a backing band (bass, drums, comping) to the progression you want to work on, loops it in the genre you like, and keeps you playing without a break. Four steps — new sheet → enter the progression in Chord Chart → turn the band on and loop → save the phrases you like. Browser only, free plan available.
How to Add Scrolling Tabs to Your Guitar Play-Through Videos — No Install, Rendered Right in Your Browser
How to add scrolling guitar TAB to a play-through video. Covers the traditional multi-step workflow (screen-recording tab software and compositing it in an editor) and a simpler one — export the TAB itself as a strip video with notave's Band (16:3) preset (1920×360) or Band Short (1080×540) for vertical Shorts, then overlay it in your video editor. The video export runs entirely in your browser.
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.