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
Arst Finder - Premium
ARST FINDER PREMIUM is the most comprehensive tool for those traveling in Sardinia using ARST public transport.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
3 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 included16 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 Arst Finder - Premium: 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
Provide robust offline map capabilities with pre-downloaded areas.
Assumption to check: Limited offline functionality in navigation apps.
Validate with people who use this workflow before building.
Hypothesis 2
Integrate real-time data and user reviews for accuracy.
Assumption to check: Inaccurate search results or place information.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify pricing tiers and offer clear benefits for each.
Assumption to check: Subscription models can be confusing or expensive.
Validate with people who use this workflow before building.
Hypothesis 4
Focus on UX and UI design to enhance user engagement.
Assumption to check: Poor user interface design can deter users.
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
ARST FINDER PREMIUM is the most comprehensive tool for those traveling in Sardinia using ARST public transport. Find routes, schedules, and fares in seconds and access advanced features designed for the most demanding travelers. What the Premium version offers: SMART SEARCH: Enter your departure and arrival dates to instantly view updated schedules and fares. SEAMLESS SEARCH: View schedules and fares without ads while browsing and searching for your routes. TICKETS OFFICES: Quickly find the ticket offices and affiliated retailers closest to your location. ROUTE DETAILS: View the complete route and a list of all stops. INTERACTIVE MAPS: Locate the exact location of stops using Google Maps. FARES AND PASSES: Cost details for single tickets and passes for the selected route. REAL-TIME BUS: View the bus's live location on the map. NOTE: This feature is currently only available on select routes (e.g., Sulcis Service). FAVORITES: Save your regular routes for ultra-fast searches. NEW: SHARDANA ROAD Bus late? Have fun with SHARDANA ROAD, the official integrated game! Challenge your reflexes and climb the rankings while waiting at the bus stop. Transparent information: Timetables are extracted from public Open Data released by the Sardinia Region (www.sardegnamobilita.it). The application is available in English! FOLLOW US ON SOCIAL MEDIA: FACEBOOK: https://www.facebook.com/orariarstsardegna/ INSTAGRAM: https://www.instagram.com/orariarstit/ WEBSITE: https://www.orariarst.it/ TELEGRAM BOT: https://telegram.me/orariarstbot IMPORTANT DISCLAIMER: ARST FINDER HAS NO CONNECTION WITH THE ARST COMPANY.
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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
expo-maps
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.
