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
Croatia Weather
Croatia Weather is the most detailed weather forecast application for Croatia country
$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'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 Croatia Weather: 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
Integrate multiple weather APIs for improved accuracy and reliability.
Assumption to check: Limited accuracy of weather data
Validate with people who use this workflow before building.
Hypothesis 2
Optimize map rendering and data fetching for faster load times.
Assumption to check: Slow loading times for radar map
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to set personalized notifications for specific weather conditions.
Assumption to check: Inability to customize location notifications
Validate with people who use this workflow before building.
Hypothesis 4
Design a more modern and intuitive UI with better navigation.
Assumption to check: Lack of a user-friendly interface
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
Croatia Weather is the most detailed weather forecast application for Croatia country. It is Your personal mobile weather station. It uses locating mechanisms to find your nearest place with weather informations. Weather data used by this application are downloaded form Croatian Meteorological and hydrological service, DHMZ (most relevant weather data source for Croatia). FEATURES: 1) 7 days forecast for 38 largest cities based on ECMWF model. This forecast presents you minimum and maximum temperature, wind and sky conditions. 2) 3 days forecast for more then 200 cities and places. It is detailed forecast based on Aladin model. 3) Weather map 4) Current weather informations for many cities and places with sky, land and precipitation condition, temperature, pressure, humidity, wind speed and direction. 5) Bio forecast. 6) Web cameras. 7) Satellite and radar images. 8) ECMWF maps for Croatia and Europe with forecast for next 5 days, pressure map and Adriatic sea wave map. 9) Aladin maps with wind, pressure and precipitation informations for Croatia and for particular regions of Croatia. 10) Complete marine forecast for Adriatic sea. There are two types of forecast: Locations forecast (using map view) and forecast represented with classic maps. Locations forecast allows you to access wave forecast or meteogram by pressing certain location on map view. Second type of forecast allows you to preview maps with mean wind, wind gusts, cloudiness and precipitation for Adriatic sea for next 72 hours. 11) UV index - maps for Croatia and Europe with UV index level.
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
Supabase
react-navigation
axios
react-native-maps
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.
