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
Favorite Hymns/Hymnals Premium
This app contains 11 hymnals containing lyrics to 1400+ hymns and Christian songs (along with some audio)
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
4 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.
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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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Favorite Hymns/Hymnals Premium: 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 offline storage for downloaded hymns.
Assumption to check: Users often complain about the lack of offline access to hymns.
Validate with people who use this workflow before building.
Hypothesis 2
Optimize search algorithm and add filtering options by category.
Assumption to check: Search functionality can be slow and return irrelevant results.
Validate with people who use this workflow before building.
Hypothesis 3
Provide themes, font sizes, and layout customizations.
Assumption to check: Limited customization options for user preferences.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce social sharing features and discussion boards.
Assumption to check: No community features for sharing or discussing hymns.
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
This app contains 11 hymnals containing lyrics to 1400+ hymns and Christian songs (along with some audio). The audio does not include the lyrics. The reason this app is not free is it contains lyrics to over 90 copyrighted Christian songs and hymns (audio may not be included for all copyrighted songs at this point). Some of these included hymns are: - How Deep the Father's Love for Us - How Great Thou Art - You are my all in all - The Power of the Cross - He Touched Me - In Christ Alone - Majesty - Great is Thy Faithfulness - The Crayon Box Song - and many more (A full listing may be found at http://gospelriver.com/music/hymnapps/favorite-hymns-premium) INCLUDED HYMNALS: - Favorite Hymns Premium (Favorites from the hymnals below along with others, including Christmas carols. Sheet music for most.) - The Believers Hymn Book (465 hymns with tunes, audio but no sheet music) - The Children's Hymn Book 1987 Premium (missing 8 of 161 songs; 9 bonus songs. Sheet music for most.) - Classic Gospel Hymns (58 hymns, all present) - Gospel Hymn Book North America 1989 (256 hymns, all present, sheet music and audio) - Gospel Hymn Book North America 2001 (407 hymns, all present, sheet music and audio for most) - Gospel Hymn Book UK 1897 (712 hymns, all present.) - Gospel Hymn Book UK 1996 (795 hymns, 4 missing) - Seed Sowers Camp Hymnal (170 songs with 65 copyrighted, only 8 of which are unavailable. Includes some Spanish translations.) - Gospel Hymns (Oliver & Higgins) - Sacred Songs and Solos FEATURES: - Enter a hymn number and view the lyrics and score - Listen to the tunes one at a time or randomly all together - Transpose the music notation and playback - Multiple playback instrument choices - Mark favorites - Take notes on each hymn - Display / play only the melody - Emphasize vocal parts to learn to sing SATB - Change the color theme - Search lyrics, tunes, and/or authors - View hymns in distraction-free presentation mode - No ads Please contact [email protected] with installation issues, feature requests or hymn requests rather than commenting on the app store. If you rate low, comment with an explanation, or better yet, email me to get it resolved first.
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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
Zustand
React Native Paper
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.
