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
Galileo Thermometer
A virtual Galileo Thermometer with real Temperature and Weather Data
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.0
2 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 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 Galileo Thermometer: 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 features like hourly forecasts and severe weather alerts.
Assumption to check: Limited functionality compared to other weather apps.
Validate with people who use this workflow before building.
Hypothesis 2
Implement modern UI elements and animations.
Assumption to check: Basic design lacks engagement.
Validate with people who use this workflow before building.
Hypothesis 3
Incorporate user accounts for personalized experiences.
Assumption to check: No user accounts for saving preferences.
Validate with people who use this workflow before building.
Hypothesis 4
Focus on improving data accuracy and reliability.
Assumption to check: Poor reviews regarding reliability.
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
A virtual Galileo Thermometer with real Temperature and Weather Data. Temperature Display, Windchill Temperature, Air Humidity, Wind Speed, Barometer. No need to select a City, due to automatic location determination the progam searches the next Weather Station automatically. Displaying Weather Data: - Date + Time of the Weather Data (Greenwichtime+Time Zone) - Windchill Temperature and Humidity % - Wind Speed in kph or MPH - Airpressure in mb, hPa, Torr (mmHg), psi or inchHg - Displaying the Station Name or the City - Temperature in °C or °F (highest value in the Galileo Thermometer=actual Temperature) Settings: - Cities for 4-days-forecast - Temperature in °C or °F - Barometer in mb, hPa, Torr, psi, inchHg - Wind Speed in kph or MPH... More Features: - Data: Internet, online (a few bytes) - Map of the Location of the Weather Station - Button for updating data - Device does not turn off, while the program is running - At Ice (under 0°C): Displaying crystals - At Rain: Water drops - At Snow: Animated snowfalls
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
axios
zustand
react-navigation
react-native-paper
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.
