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
Samoan Hymn
The purpose of this application is to make the Hymn available for mobile users and to have it handy whenever they want it.
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
39 ratings · Top 15%
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 Samoan Hymn: 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
Offer full offline access with downloads.
Assumption to check: Limited offline access to hymns
Validate with people who use this workflow before building.
Hypothesis 2
Integrate social sharing to allow users to share hymns.
Assumption to check: Lack of social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Add background audio playback for multitasking.
Assumption to check: No background playback support
Validate with people who use this workflow before building.
Hypothesis 4
Enhance search with filters and categories.
Assumption to check: Limited search functionality
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
The purpose of this application is to make the Hymn available for mobile users and to have it handy whenever they want it. This app is still under development and It may still have a few misspellings here and there that may need to be updated. Please feel free to advise of any mistakes, bugs in the application or any recommendations you may have so I can look into it. Features: - No ads - Choose from 3 different font style - Font size adjustable - Themes. (Light or Dark) - Hymn 1 - 425 - Add a favorite Hymn.(No limit) - Search: - Basic search - Allows you to quickly search by hymn number or title only - Advanced search - Allows you to search by phrase or any word of any hymn (Good option for those that cannot remember the number or title of the hymn) - 100% offline. (no need to connect to the internet) Tips - To remove a hymn from your favorites list, swipe left or right on the hymn you would like to remove - To remove the whole favorites list, tap on the rubbish bin icon on the top right corner of the favorite list screen. I hope you will all enjoy using this app and hopefully find it useful. Fa'afetai
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
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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.
