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
Gankogui
Gankogui is the iron double bell that plays the timeline rhythm for Ghanaian drum and dance music
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
6 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 Gankogui: 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
Focus on niche genres or independent artists.
Assumption to check: Limited song selection compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Integrate social sharing and collaborative playlists.
Assumption to check: Lack of social features for sharing music
Validate with people who use this workflow before building.
Hypothesis 3
Enhance offline listening experience with better downloads.
Assumption to check: Poor offline functionality
Validate with people who use this workflow before building.
Hypothesis 4
Introduce a freemium model with more accessible features.
Assumption to check: Monetization may deter new users
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
Gankogui is the iron double bell that plays the timeline rhythm for Ghanaian drum and dance music. All other musicians in the ensemble relate the timing of their parts to the gankogui rhythm. Gankogui is the West African ancestor of Afro-Caribbean clave. The Gankogui app offers users a library of Ghanaian timeline rhythms with authentic sound samples and flexible-tempo playback. Learners and practitioners of West African drum and dance music can use Gankogui as a powerful practice tool. Musicians and researchers can utilize the broad library of timeline rhythms to expand their knowledge of West African rhythm. Instrumentalists from all backgrounds can use Gankogui as a more exciting, advanced, and musically pleasing alternative to a standard metronome. Reflecting the origins of these traditional bell patterns, the app is organized into two categories: Asante and Ewe. Asante features twelve timeline patterns using Kete and Fontomfrom dawuro sound samples. Ewe features eight bell patterns utilizing gankogui sound sample playback. Asante Bell Patterns -Standard Kete Dawuro -Adowa -Adowa Highlife -Fontomfrom: Akantam -Fontomfrom: Nnawea -Kete: Adaban -Kete: Adowa Kete -Kete: Akonkonobetee -Kete: Apente -Kete: Sresre Bi Di -Nnwonkoro -Sikyi Ewe Bell Patterns -Standard Ewe 12/8 Bell -Adzogbo: Fast -Adzogbo: Slow -Borborbor -Gahu -Gota -Kinka -Tokoe
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
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BUILD KIT DIFFICULTY
Starter
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.
