App Overview

WaayFinder: Music Key Finder icon

WaayFinder: Music Key Finder

Ten Kettles Inc. · Music

You give WaayFinder notes, it gives you all the keys and modes that fit

$4.99 · In-app purchases

PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
5.0
20 ratings · Top 5%

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.

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What's included16 files

A product spec, phased build plan, differentiation notes, and screen references.

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.

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.

Screen plan

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.

Differentiate and validate

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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> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for WaayFinder: Music Key Finder: map the core Music workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
            

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Opportunities

AI-GENERATED OPPORTUNITY HYPOTHESES

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.

Hypothesis 1

Add features like chord suggestions or song recommendations based on key.

Assumption to check: Limited functionality with only key finding.

Validate with people who use this workflow before building.

Hypothesis 2

Implement offline song storage and key finding.

Assumption to check: No offline capabilities.

Validate with people who use this workflow before building.

Hypothesis 3

Introduce multiple subscription tiers with different features.

Assumption to check: Single subscription tier could limit users.

Validate with people who use this workflow before building.

Hypothesis 4

Enrich UI with more engaging visuals and interactive elements.

Assumption to check: User interface can feel sparse.

Validate with people who use this workflow before building.

App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

App Store description

You give WaayFinder notes, it gives you all the keys and modes that fit. Top matches come first! Filter results by scale type, listen to any scale (or note) with a tap, look up keys by name, and more.  - Maybe these notes are a melody you came up with, and you want to know what key they're in—to help you write another section of the song, pick chords, or write some harmonies. WaayFinder is here to help! - How does it work? Let's say you enter the notes C, G, and A. The best match is C major—but it could also fit A minor, G major, and more. WaayFinder shows you all those possibilities, but highlights the best matches so you know where to start. - Features: * Finds matching keys. You give WaayFinder notes, it shows all the scales and modes that match, in order of best fit. * Scales and modes. Filter results by scale or mode. Supports major (Ionian), natural minor (Aeolian), harmonic minor, Dorian, Phrygian, Lydian, Mixolydian, and Locrian. * Integrated audio. Listen to any note or scale with a tap. Great for getting a quick reference pitch! * Scale look-up. Quickly look up—and listen to—the notes for any key. * Tutorial. In-app tutorial gets you up and running in a flash. * Enharmonic mode. Display keys that match any enharmonic equivalents of the notes you entered (e.g., Bb will match A#) * Special note keyboard allows for speedy input. - WaayFinder is made in Toronto, Canada by Ten Kettles—the one-person (and two dog) company behind Waay, hearEQ, and Beat Mirror. I deeply believe in empowering *you* to make your best music, and that approach imprints itself into all my apps. There are no ads, no sneaky data collection, just honest music education. :)   - Questions, comments, or feedback? Get in touch anytime at alex[at]tenkettles[dot]com and I'll (almost always) get back to you by the next business day. -Alex

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Screenshots

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Build scope

Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.

Define the first version

Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.

Set boundaries

Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.

Check the hard parts

Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.

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BUILD KIT DIFFICULTY
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From the Build Kit assessment.

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.