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
New Believers Hymn Book (NBHB)
Both complete editions of the Believers Hymn Book with audio and sheet music + gospel hymnals
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.0
4 ratings · Top 30%
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 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.
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 New Believers Hymn Book (NBHB): 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
Offer a more extensive library or user-generated content.
Assumption to check: Limited hymn selection compared to other apps.
Validate with people who use this workflow before building.
Hypothesis 2
Implement offline access for downloaded hymns.
Assumption to check: No offline access to hymns.
Validate with people who use this workflow before building.
Hypothesis 3
Add audio playback for all hymns.
Assumption to check: Lack of audio features for most hymns.
Validate with people who use this workflow before building.
Hypothesis 4
Include social sharing features for users to share favorite hymns.
Assumption to check: No social sharing 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
Both complete editions of the Believers Hymn Book with audio and sheet music + gospel hymnals Both feature-rich and easy to use, the app enables you to: - Enter a hymn number and view the lyrics and score (scores available for Believers Hymn Books and North American Gospel Hymn Books) - Listen to the tunes one at a time or randomly all together - Choose alternate associated tunes or select a custom tune - Transpose the music notation and playback at different speeds with different instruments - Mark favorites - Take notes on each hymn - Display / play only the melody - Emphasize vocal parts to learn to sing SATB - Change the color theme - Information about hymn authors for both Believers Hymn Books - Search lyrics, tunes, and/or authors - View hymns in distraction-free presentation mode - Includes copyrighted hymns such as "How Great Thou Art," "How Deep the Father's Love for Us," "Because He Lives," "In Christ Alone," "Some Golden Daybreak," and more. - No ads
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
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.
