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
Catholic Encyclopedia Offline
The 1914 Catholic Encyclopedia is the most comprehensive resource on Catholic teaching, history, and information ever gathered in all of human history
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
140 ratings · Top 15%
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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Catholic Encyclopedia Offline: 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
Improve offline data caching and accessibility.
Assumption to check: Limited offline capabilities compared to other apps
Validate with people who use this workflow before building.
Hypothesis 2
Implement faster indexing and searching algorithms.
Assumption to check: Search functionality can be slow
Validate with people who use this workflow before building.
Hypothesis 3
Add user comments or discussion boards.
Assumption to check: Lack of user engagement features
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate AI for suggesting articles based on user preferences.
Assumption to check: No personalized recommendations
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 1914 Catholic Encyclopedia is the most comprehensive resource on Catholic teaching, history, and information ever gathered in all of human history. Now you can study all documents with unique optimization for iPhone and iPad devices. Enjoy more than 11 500 articles and images through a very simple and intuitive user interface. After initial data download, there is no need for any Internet connection, so you can read all texts anywhere and anytime! Share or print your favorite articles. The work with the app is very easy. You can list all articles alphabetically or you can use our enhanced search system to find only articles what you are interested in. The original Catholic Encyclopedia contains various important information about the history, geography and religion topics. The encyclopedia is highly appreciated and recommended by the experts and ordinary people. What our customers are saying: "This app helps me so much when I'm reading the Bible. Its such a great reference tool. Every Catholic should own this app." - Tansey214, USA "So much great info in this app. Well worth the very humble price" - Fusionarts, USA "Interface is easy to use, tons of information inside. Searching for specific information is really easy a very solid app." - Jopesta, USA The application features: - Offline access - no Internet connection is needed - Search ability - simply find the topic what you are interested in - Social - share the articles with your friends - Bookmarks - mark your favorite articles - Accessibility - change font size and text color - Interlinks - easy and smart cross reference among the articles All texts and images are in English language.
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
Zustand
React Navigation
Axios
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.
