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
National Park Service
The Official NPS App – Your Ultimate National Park Companion!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
129,339 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/
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 National Park Service: map the core Travel 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
Include offline access to park maps and essential information
Assumption to check: Limited offline functionality in remote areas
Validate with people who use this workflow before building.
Hypothesis 2
Standardize park information and design for consistency
Assumption to check: Inconsistent user experience across different parks
Validate with people who use this workflow before building.
Hypothesis 3
Enhance event filtering and search capabilities
Assumption to check: Difficulties in finding specific events
Validate with people who use this workflow before building.
Hypothesis 4
Implement social sharing options and user-generated content
Assumption to check: Lack of social features for users to share experiences
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 Official NPS App – Your Ultimate National Park Companion! Download parks before your visit and use the app when there is no internet. • Explore 420+ national parks effortlessly with interactive maps, self-guided tours, and essential on-the-ground information. • Interactive Maps: Plan your trip with detailed park maps, including points of interest, trails, and essential information. • Park Tours: Discover park highlights with self-guided tours, just like having a ranger by your side. • Amenities: Find transportation, dining, restrooms, and more for a hassle-free visit. • Plan Your Visit: Access fee and pass information, operating hours, and other essential details to help you plan your visit. • Accessibility: Enjoy a fully accessible experience with audio descriptions for points of interest and exhibits, making it inclusive for all. • Offline Use: No internet? No worries! Download park content for offline exploration, perfect for remote areas. • Park of the Day Widget: Add it to your iOS widgets and discover a new NPS-managed site each day. • Things to Do: Explore hiking, bus tours, museums, ranger programs, and more for a fun-filled visit. • News, Alerts & Events: Stay updated with park news and events. • Passport Stamps, Fees & More: Access park-specific details all in one place. Discover all 420+ National Park System sites, from iconic landmarks like Yellowstone and Yosemite to hidden gems. Download the official NPS App now for an unforgettable park adventure!
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
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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.
