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
Icilongo Zulu Hymn Journal
Carry the entire Icilongo Levangeli hymnbook in your pocket
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 Icilongo Zulu Hymn Journal: map the core Reference 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
Allow users to customize hymn layouts and themes.
Assumption to check: Limited hymn customization options.
Validate with people who use this workflow before building.
Hypothesis 2
Enable hymn sharing with a community or friends.
Assumption to check: No community sharing features.
Validate with people who use this workflow before building.
Hypothesis 3
Implement offline access for hymns.
Assumption to check: Lack of offline access.
Validate with people who use this workflow before building.
Hypothesis 4
Add audio features to play hymns.
Assumption to check: No audio playback for 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
Carry the entire Icilongo Levangeli hymnbook in your pocket. Whether at church, home, or on the go, iCilongo makes it easy to find, sing, and share timeless hymns of faith. Features you’ll love: - Complete Hymn Library: Access all 262 hymns from Icilongo LeVangeli, beautifully formatted and numbered. - Journaling: Add notes, reflections, or prayer thoughts to any hymn. Write what each song means to you, right where it’s sung. - Powerful Search: Quickly find hymns by number, title, or any word in the lyrics. - Offline Mode: Download hymns to your device and sing without needing internet access. - Favorites & Bookmarks: Save your most-loved hymns for quick access anytime. - Lyrics Sharing: Share or copy hymn lyrics to social and messaging apps in one tap. - Dark Mode & Text Resize: Adjust for readability with large text and night mode. Why iCilongo? Faith meets simplicity. iCilongo brings the treasured Zulu hymn tradition into a modern, easy-to-use app that works anywhere, anytime. Designed for worshippers, choirs, and families alike, it helps keep the spirit of song alive across generations.
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
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.
