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
Clean Barometer
Clean Barometer is a minimalist barometric pressure tool for iPhone, Apple Watch, and Widget.
$0.99 · In-app purchases
PRICE
$0.99
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 Clean Barometer: 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
Provide detailed forecasts and radar maps.
Assumption to check: Limited data on weather conditions and forecasting
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to choose themes or layouts.
Assumption to check: No customization options for users
Validate with people who use this workflow before building.
Hypothesis 3
Implement push notifications for severe weather.
Assumption to check: Lack of severe weather alerts
Validate with people who use this workflow before building.
Hypothesis 4
Integrate with APIs for richer data.
Assumption to check: No integration with other weather services
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
Clean Barometer is a minimalist barometric pressure tool for iPhone, Apple Watch, and Widget. It focuses on two things: measure pressure, keep records. Use it to: - Check live measured pressure - View sea-level pressure, altitude, and temperature - Record the current moment quickly on iPhone and Apple Watch - Review past records through a clean dot plot - Check current pressure and recent distribution from the widget This is not an overloaded weather app. It is a calm, trustworthy tool for checking and recording environmental pressure data. Highlights: - Minimal main interface - Supports iPhone, Apple Watch, and Widget - Shared record data across devices - Records location, pressure, altitude, and temperature together - Chinese and English localization Good for: - Hiking, cycling, camping, and outdoor use - People who care about pressure changes - Users who prefer simple tools over complex weather dashboards - Anyone who wants quick environmental records
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
axios
react-navigation
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.
