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 Mass Times
Find Catholic Churches near me and their Mass Times instantly
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
4,884 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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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 Catholic Mass Times: map the core Navigation 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
Incorporate user-submitted church entries to expand database.
Assumption to check: Limited church database, leading to missing local options
Validate with people who use this workflow before building.
Hypothesis 2
Enable real-time updates from church administrators.
Assumption to check: Inconsistent Mass time updates
Validate with people who use this workflow before building.
Hypothesis 3
Integrate turn-by-turn navigation and directions.
Assumption to check: Difficulties in navigating to church locations
Validate with people who use this workflow before building.
Hypothesis 4
Add a feature for users to set reminders for their favorite Mass times.
Assumption to check: No option to set reminders for Mass times
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
Find Catholic Churches near me and their Mass Times instantly. Completely FREE service. Discover the #1 MOST POPULAR APP WORLDWIDE for locating Catholic churches and their Mass times. Featured by all leading Catholic media outlets, including EWTN, Vatican News, Rome Reports, Aleteia, ACI Prensa, National Catholic Register, Omnes, AICA, Catholic.net, Religion en Libertad, Infobae, CNA, Info Catolica, CNN, and Relevant Radio, this application is a vital resource for Catholics everywhere. GLOBAL COVERAGE Access information for over 130,000 churches globally, with more than 10,000 updates each month. The most comprehensive and updated database of Catholic churches in existence! INSTANT LOCATION Quickly find nearby churches with precise addresses and transit directions. COMPREHENSIVE SCHEDULES View Mass, confession, and adoration times. Parish office and parish activities. DETAILED CONTACT INFORMATION Get phone numbers, email addresses, and website links for churches. SEARCH AND FILTER Visualize nearby churches by distance, search by text (within church names, addresses, cities, or zip codes), or filter churches using the quick action buttons Mass Today, Confession Today, Adoration Today, or the advanced filters by day, time range, and language. Easily find nearby masses between 6:00 PM and 6:59 PM, or masses in English (when visiting another country), masses in Latin, or mass/confession in Spanish if you prefer that language. COMMUNITY-DRIVEN UPDATES Report errors or request the addition of a church directly through the app. With over 75,000 users contributing data, updates are typically published within hours. Whether you're at home or traveling, this app empowers you to attend daily Mass or weekly confession with ease, anywhere you go. Join this thriving global community of Catholics supporting each other in practicing their faith!
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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 Navigation
Expo Location
Axios
React Native Maps
Supabase
BUILD KIT DIFFICULTY
Advanced
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.
