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
Jinghpaw Hymnal
The Jinghpaw Hymnal app is designed for worshippers, choir members, and music students, providing a digital companion for worship and praise.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 Jinghpaw Hymnal: map the core Books 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
Expand hymn database and implement a categorization feature for easier browsing.
Assumption to check: Limited hymn selection and categories
Validate with people who use this workflow before building.
Hypothesis 2
Introduce features like favorites, playlists, and notifications for new hymns.
Assumption to check: Poor user engagement and retention
Validate with people who use this workflow before building.
Hypothesis 3
Add social sharing features for users to share their favorite hymns.
Assumption to check: No sharing options for hymns
Validate with people who use this workflow before building.
Hypothesis 4
Integrate advanced audio features like background play and speed control.
Assumption to check: Limited audio playback options
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 Jinghpaw Hymnal app is designed for worshippers, choir members, and music students, providing a digital companion for worship and praise. Key Features Complete Staff Notation: Access the full collection of Jinghpaw hymns with high-quality staff notation for every song—perfect for musicians and singers. Advanced Search & Sort: Find hymns instantly by Hymn Number or Title. Sort your hymn list numerically or alphabetically to suit your preference. Responsive Readings: Includes the complete set of responsive readings. Music Reference Guide: A dedicated section for learning how to read staff notation, helping everyone participate in the musical tradition. Official KBC Preface: Read the historical context and dedication from the Kachin Baptist Convention Hymnal Committee. Whether you are in a church service, at a home prayer meeting, or studying music, this app ensures you have the most accurate and official KBC hymnal resources available offline.
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
Supabase
React Navigation
@react-native-paper
expo-av
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.
