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
SDA Hymnal Pro
SDA Hymnal Pro contains all hymns of the Seventh-Day Adventist Hymnal both audio and lyrics, including all responsive readings
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.1
17 ratings · Below Average
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 SDA Hymnal Pro: 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
Implement advanced search filters and sorting options.
Assumption to check: Limited search functionality compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Enhance UI design with modern aesthetics and animations.
Assumption to check: User interface is not modern or visually appealing.
Validate with people who use this workflow before building.
Hypothesis 3
Focus on robust testing and bug fixes before launch.
Assumption to check: Subpar ratings due to bugs and crashes.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce offline mode for users to access hymns without internet.
Assumption to check: Lack of offline access to hymnal content.
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
SDA Hymnal Pro contains all hymns of the Seventh-Day Adventist Hymnal both audio and lyrics, including all responsive readings. However, it does not include any sheet music. Some of the features of the application are • Open hymns by entering the number directly • Search hymns by title, number, and content • Browse hymns by category • Keep a list of favorite hymns • Share hymns by text message and email • Browse hymns alphabetically • Browse hymns in numerical order • Stream the audio hymns to save memory • Extremely fast downloads provided by a large CDN The application also offers • Two view modes, pages and continuous • Multiple typefaces with adjustable font size • Two color themes • Full screen support • Pinch-to-zoom in page view mode • Optimized landscape mode • Absolutely no ads For any lyrics inconsistency with the Seventh-Day Adventist Hymnal, please contact the developer to have it fixed immediately instead of leaving negative feedback. Also, for any technical issues, comments and suggestions please contact the developer.
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
React Navigation
Zustand
@react-native-gesture-handler
@react-navigation/native
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.
