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
Snowflake Weather
Snowflake is an incredibly detailed weather app, covering almost everything you could possibly want to know about current conditions and forecasts
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.2
102 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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included18 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 Snowflake 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 a more reliable weather API for better accuracy.
Assumption to check: Inaccurate weather data compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Offer more granular notification settings.
Assumption to check: Limited customization options for notifications.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the UI by prioritizing essential information.
Assumption to check: Cluttered UI with too many elements on screen.
Validate with people who use this workflow before building.
Hypothesis 4
Provide clearer explanations of paid features and benefits.
Assumption to check: In-app purchases can be confusing.
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
Snowflake is an incredibly detailed weather app, covering almost everything you could possibly want to know about current conditions and forecasts. Snowflake is privacy focused, with no ads, no analytics, and no creepy tracking. - Incredibly comprehensive weather data. - iPhone and iPad app. - Apple Watch app. - Apple Watch complications. - 11 Widgets. - Siri Shortcuts. - 4 weather providers. - 4 themes and automatic day/night theme switching. - 6 icons. - No ads, no analytics, and no creepy tracking. --- Snowflake Plus --- Snowflake Plus is an optional subscription that adds maps, background refresh for watch complications, and many customization features. - 24 hours of historical hourly data when using TWC or WillyWeather data. - Multiple weather providers. - More frequent widget updates. - 15 day forecast when using TWC. - Animated rain and snow radar map layer. - Clouds map layer with animation. - Combined radar and clouds map layer. - Wind Speed map layer. - Temperature map layer. - Dew Point map layer. - Pressure map layer. - Humidity map layer. - 24 hour rainfall map layer. - 24 hour snowfall map layer. - Animated forecast rain and snow radar map layer. - Animated forecast cloud map layer. - Customize what’s shown in current conditions. - Hide rows in current conditions. - Switch to a compact version of current conditions. - Today Widget: Customize what’s shown in current conditions. - Apple Watch: 15 day forecast when using TWC. - Apple Watch: Customize what’s shown in current conditions. - Apple Watch: Customize what’s shown in hourly forecasts. - Apple Watch: Background data to keep complications up-to-date. Privacy policy: https://bjango.com/help/snowflakeios/privacy/ Terms of use: https://bjango.com/help/snowflakeios/terms/
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-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.
