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
ZTL
Know every ZTL before you drive into it.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.3
3 ratings · Below Average
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 included18 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 ZTL: 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
Implement robust offline maps and navigation.
Assumption to check: Limited offline functionality
Validate with people who use this workflow before building.
Hypothesis 2
Enhance user experience with better UI/UX.
Assumption to check: Poor user ratings
Validate with people who use this workflow before building.
Hypothesis 3
Integrate voice navigation for hands-free use.
Assumption to check: Lack of voice navigation
Validate with people who use this workflow before building.
Hypothesis 4
Optimize search functionality for faster results.
Assumption to check: Slow search results
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
Know every ZTL before you drive into it. ZTL shows all of Italy's limited traffic zones on one map: 3,000+ camera gates in 470+ cities, color-coded live — red means the restriction is active now, green means you can pass, gray means the schedule is unknown. WHY ZTL • All of Italy in one app: open the map and instantly see gate counts per area • Live color-coded pins for every gate, with days and hours • Exact zone boundaries: tap any area for its perimeter and hours (OpenStreetMap data) • Gate data stored on your device: works even without internet • Proximity alerts when you approach an active zone (opt-in) • Search any city and jump straight to its gates • List view grouped by city, with your favorites on top • Look Around preview so you recognize the gate once you're on the road • Share any gate with your travel companions in one tap • 3 pin styles and a clean map with POI hidden • Fast, lightweight, no sign-up. 42 languages Perfect for tourists, delivery drivers and anyone driving in an unfamiliar Italian city. Avoid fines: check the gate before you cross it. Download now and drive with confidence.
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
Zustand
react-navigation
axios
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.
