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
Trinity Psalter Hymnal
The highly-anticipated Trinity Psalter Hymnal app has been professionally developed and designed for ease of use and seamless functionality for both iPad and iPhone.
$9.99 · In-app purchases
PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
92 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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included15 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 Trinity Psalter Hymnal: 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
Expand hymn library with user submissions or community input.
Assumption to check: Limited hymn selection compared to physical hymnals.
Validate with people who use this workflow before building.
Hypothesis 2
Implement an easy offline download feature for hymns.
Assumption to check: No offline access without download feature.
Validate with people who use this workflow before building.
Hypothesis 3
Add social sharing features to allow users to share hymns with friends.
Assumption to check: Missing social sharing options for hymns.
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to customize text size and background color for accessibility.
Assumption to check: No customization options for hymn display.
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 highly-anticipated Trinity Psalter Hymnal app has been professionally developed and designed for ease of use and seamless functionality for both iPad and iPhone. Intended as a supplement to the print and digital editions of the Trinity Psalter Hymnal, the Trinity Psalter Hymnal app features the full text and music of the songbook, as well as professional and high-quality piano tune recordings. Some key features of the app include searchable full text, browsable title and first line index, browseable hymn table of contents, bookmarking of songs, and looping of a tune for the number of stanzas in each song. The mobile app is a great resource for planning worship, learning new songs, and singing along in family devotions. Future app upgrades and features are being developed to include more robust Scripture and tune indexes akin to those in the print editions. By purchasing and downloading digital editions of the Trinity Psalter Hymnal, the purchaser agrees to the TPH Digital End User Agreement.
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 Navigation
Expo AV
React Native Async Storage
React Native Vector Icons
TypeScript
Zustand
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.
