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.
Marea turns any map into a precise area and distance calculator
Free · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Map Area Calculator - Marea: 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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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
Assumption to check: Limited features for advanced calculations
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Inaccurate area calculations in some cases
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: User interface can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of offline functionality
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Marea turns any map into a precise area and distance calculator. Measure fields, plots, rooftops, lawns and lakes — anything you can see from above — in seconds. FOUR WAYS TO MEASURE - Tap to drop pins around a region and get its area instantly. - Draw a freeform shape with your finger and Marea traces the outline. - Walk the perimeter and GPS drops pins automatically as you go. - Auto-detect plots — tap to find buildings, fields and parks already on the map and turn one into a measurement in a single tap. RESULTS IN EVERY UNIT Area in square meters, square feet, acres, hectares, square kilometers and square miles — plus the distance between every point. TRACTOR MODE Turn your phone into a field-coverage guide. Set your implement width and speed, then drive: Marea records each pass, draws your covered area live, and tracks total distance and worked acreage. Pause, resume and save passes. GRID OVERLAY Drop a measured grid over any plot to plan rows, sections or spacing — horizontal, vertical or both, with the spacing, direction and color up to you. PROJECT AN AREA Pin a saved plot to the centre of the screen at its real size, then pan and rotate around it to plan, compare or align on the ground. ORGANIZE & ESTIMATE - Save your areas and revisit them anytime - Drop labeled markers on the points that matter - Keep a to-do list for every area - Add notes and attach photos - Estimate prices by multiplying any rate by the measured area SHARE ANYWHERE Send a web link to any saved area — anyone can open it in a browser to see the polygon, its size and details. You can also export a KML file or share a map image or PDF. BUILT FOR THE FIELD AND THE JOB SITE Made for farmers, agronomists, roofers, pavers, landscapers, surveyors and real-estate pros: - Estimate roofing, asphalt, paving, turf and seeding quantities - Check property lines, lot sizes and parcels - Plan plots, gardens and farmland Subscription terms: - The subscription auto-renews at the end of each term. - Payment will be charged to iTunes Account at confirmation of purchase. - The subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. - Account will be charged for renewal within 24-hours prior to the end of the current period. - You may manage your subscription and turn off auto-renewal by going to your Account Settings after purchase. Privacy policy and Terms of Use: https://mapareacalculator.com/privacypolicy/
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.