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
GR 20 - Corsica
GR20 is your essential guide to hiking the legendary GR20 trail across Corsica – one of Europe’s toughest and most rewarding long-distance treks.
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 included15 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 GR 20 - Corsica: 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
Implement offline maps for better user experience.
Assumption to check: Limited offline functionality for trail maps
Validate with people who use this workflow before building.
Hypothesis 2
Create a robust review system that encourages user feedback.
Assumption to check: Lack of user reviews for hikes
Validate with people who use this workflow before building.
Hypothesis 3
Implement filtering options based on difficulty and duration.
Assumption to check: Difficulties in finding trails based on fitness level
Validate with people who use this workflow before building.
Hypothesis 4
Add features to share trails and experiences on social media.
Assumption to check: Limited social sharing options
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
GR20 is your essential guide to hiking the legendary GR20 trail across Corsica – one of Europe’s toughest and most rewarding long-distance treks. Stretching over 180 kilometers from Calenzana in the north to Conca in the south, the GR20 takes around 15 days to complete and offers dramatic scenery, steep climbs, and unforgettable moments along the way. Whether you’re a seasoned hiker or tackling the trail for the first time, this app helps you plan and navigate your journey with confidence. Highlights of the GR20 experience include: - Crossing the dramatic Spasimata footbridge, suspended over a deep gorge with stunning views below - Climbing to the summit of Monte Cinto, Corsica’s highest peak, for panoramic mountain vistas - Winding through the wild and remote Cirque de la Solitude, a challenging but iconic section of the trail From alpine lakes and rocky ridges to forested valleys and remote mountain refuges, the GR20 offers a diverse and unforgettable adventure. Let this app be your trusted companion along the way. GR 221 has 4 different hiking routes : GR 20 GR 20 (15 days) GR 20 (North) GR 20 (South) This hiking app provides the following features: - Detailed hiking maps - Points of interested (lodging, eating, tourism, nature, toilet etc) - Frequent updates - Detailed info about points of interests (direction, distance, image, opening hours, reviews, business status) - Trail Alarm, your hiking assistant that helps you get back on track if you make a wrong turn - Maps offline mode via caching. - App languages: English, Danish, German and Spanish. We hope you love this app as much as we have loved creating it. If you you have any comments, feel free to reach out to us via email.
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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
React Native Maps
Zustand
Axios
Expo Location
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.
