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
¿Hay Agua?
¿Hay agua? shows you at a glance how Puerto Rico's reservoirs are
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.2
5 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 included17 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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for ¿Hay Agua?: map the core Weather 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
Add unique features like air quality index and rain notifications.
Assumption to check: Limited features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Integrate multiple reliable data sources for improved accuracy.
Assumption to check: Inaccurate weather data sometimes
Validate with people who use this workflow before building.
Hypothesis 3
Redesign UI with modern aesthetics and improved usability.
Assumption to check: User interface feels outdated
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to personalize their weather notifications and display settings.
Assumption to check: Lack of customization 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
¿Hay agua? shows you at a glance how Puerto Rico's reservoirs are doing, with data straight from the U.S. Geological Survey (USGS). All in one list The island's 23 reservoirs on a single screen, each with its current level and which way it's heading. Mark the ones you care about as favorites and they stay at the top. The full history Tap any reservoir to see its level over the last 7, 30, or 90 days in a clear chart, along with how much it has risen or fallen in the last hour, day, week, and quarter. Alert level Each reservoir shows which band it falls into —Overflow, Safety, Observation, Adjustments, Control, or Out of service— with the same colors and thresholds published by Puerto Rico's Aqueducts and Sewers Authority (AAA). Search By reservoir name or by your municipality. Where the data comes from From USGS gauges, which take readings every 15 minutes. The data is provisional and subject to revision. The app shows where the USGS reading falls; AAA's official bulletin may report a different band, since it measures with its own instruments. English and Spanish. With dark mode and Dynamic Type.
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
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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.
