Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
Tapko Harmony does what a guitar-driven vocal harmony pedal does, right inside your iPad or iPhone
$9.99
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
Your first Build Kit is free with a verified email.
Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Tapko Harmony does what a guitar-driven vocal harmony pedal does, right inside your iPad or iPhone. It turns your guitar chords into live vocal harmonies. Play and sing as you always do: the harmony follows every chord change, with no MIDI programming and no key to set. It comes as two AUv3 plug-ins that work together in your favorite host (AUM, Loopy Pro, GarageBand and others): • Tapko Harmony – Guitar listens to your guitar and recognizes the chords you play. • Tapko Harmony – Voice listens to your voice and sings harmonies that fit those chords. The two plug-ins find each other on their own. No cables, no routing, no setup. TWO HARMONY VOICES • Harmony 1 sings above you by default, always on a note of the current chord. • Harmony 2 adds a second voice, below you by default. • Volume and pan for each harmony, so you can place them left and right around your lead. • Dry + Harmony: keep your voice in the mix, or output only the harmonies to mix them on their own channel. MAKE THE HARMONY YOURS (EXPERIMENTAL) Harmony rules let you choose which notes your harmonies sing: • Follow your guitar, lock the harmony to your song's key, or enter your song's own chords. • Pick a style: third or fifth above, third or sixth below, or a fixed interval. • Write rule cards for your chords to get exactly the harmony you hear in your head. • Harmony 2 has its own picker and its own rule cards. Tapko Standard, the automatic harmony, is always one tap away. START FROM A PRESET Five ready-made sounds in the Voice plug-in: Natural, Tight, Ballad, Choir and Pure. Pick one and play, or use it as a starting point for your own. MADE FOR LIVE PLAYING • Low latency, so the harmony lands with you, not after you. • A natural-sounding pitch shifter that keeps the character of your own voice. • Steady harmonies that stay put when your pitch wavers or you slide between notes. • The song key is found automatically. • Tuned down, or slightly off A = 440? The harmonies follow your guitar's own tuning. • No guitar? Send chords over MIDI from a keyboard or your host instead. • MIDI out (experimental): send the harmony notes to another synth or pitch shifter. SHAPE THE SOUND The Advanced tab lets you fine-tune how the harmony feels: how closely it follows your pitch, how it glides between notes, vibrato and tone. Make it human adds the touches of a real backing singer: a slightly late entry, a small scoop, gentle drift and a doubled voice. SAVES WITH YOUR SONGS Every setting, your chords and rule cards included, is saved with your host project and in host presets, so each song comes back exactly as you left it. BUILT WITH YOU Tapko Harmony is ready for the stage today and actively developed, with its direction set by the people who use it. The Support tab in both plug-ins lets you: • Send feedback in seconds. The report includes the plug-in settings and a short technical log, and the screen shows exactly what is sent. • See the roadmap: what is planned, in progress and just shipped. • Read the how-to for setup and quick fixes. TYPICAL SETUP 1. Load Tapko Harmony – Guitar on your guitar channel. 2. Load Tapko Harmony – Voice on your vocal channel. 3. Play and sing. The harmony follows your chords. GREAT FOR • Solo singer-songwriters playing live. • Duos and small acts who want a bigger vocal sound. • Songwriters sketching harmony ideas. • Anyone recording vocals on iPad or iPhone in an AUv3 host. GOOD TO KNOW • Real-time chord detection and harmony take real processing power. Tapko Harmony is very CPU efficient, but a recent iPad or iPhone gives the best live experience. • Clean, direct guitar and vocal signals on separate inputs give the best results. FROM TAPKO Tapko Harmony joins Tapko, Tapko Komp and Pitchli on the App Store, and more Tapko plug-ins for live musicians are on the way.
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These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
Not assessed in a Build Kit yet.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.