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.
App Overview
EarGuru
Only you can do the work of serious ear training
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
4 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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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included17 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.
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for EarGuru: 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
Introduce a wider range of exercises and gamified elements to keep users engaged.
Assumption to check: Limited variety of exercises can lead to user fatigue
Validate with people who use this workflow before building.
Hypothesis 2
Add social sharing options to encourage competition and community.
Assumption to check: Lack of social features for sharing progress
Validate with people who use this workflow before building.
Hypothesis 3
Implement offline mode for exercises to enhance usability.
Assumption to check: No offline access to exercises
Validate with people who use this workflow before building.
Hypothesis 4
Provide detailed feedback and tips based on performance metrics.
Assumption to check: Limited feedback on performance
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
Only you can do the work of serious ear training. EarGuru helps you do it with three independent modes, each targeting a specific area. In LISTEN mode, EarGuru plays a group of notes, all different, and you try to identify them from lowest to highest. Beginners will want to start with 1, then move to 2. Experts can go all the way to 11 notes if they choose to. In PLAY mode, EarGuru plays a note, or a chord of up to 4 notes, and you play it back as quickly as possible on your instrument before it moves on to the next one. In SING mode, EarGuru asks you to sing a note, and as you're singing, EarGuru plays the note so that you can make sure you've sung it correctly and in tune. All three modes can be used without looking at the screen, using the CONTINUOUS PLAY mode. This app relies on you, as a serious musician, to self-evaluate. If used regularly, it can completely transform your hearing.
Written user reviews are not shown here. Check current App Store reviews >
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.
SUGGESTED BUILD STACK
React Native
Expo
TypeScript
Firebase
React Navigation
react-native-chart-kit
BUILD KIT DIFFICULTY
Intermediate
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.
