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
RainDrop - Rain Totals & Radar
RainDrop is the most accurate way to see how much it rained or snowed at your exact location — no rain gauge needed
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
21,812 ratings · Top 15%
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 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 RainDrop - Rain Totals & Radar: 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
Improve data sources for real-time accuracy
Assumption to check: Limited accuracy of rain forecasts
Validate with people who use this workflow before building.
Hypothesis 2
Allow customizable notification settings for users
Assumption to check: Notifications can be overwhelming
Validate with people who use this workflow before building.
Hypothesis 3
Implement caching for offline access to saved data
Assumption to check: No offline functionality
Validate with people who use this workflow before building.
Hypothesis 4
Simplify UI and improve layout for better user experience
Assumption to check: User interface can be cluttered
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
RainDrop is the most accurate way to see how much it rained or snowed at your exact location — no rain gauge needed. RainDrop delivers real-time precipitation totals with pinpoint accuracy for any spot in the United States. Built for farmers, contractors, landscapers, gardeners, and anyone who needs to know exactly how much it rained and how much it will rain. PRECISE RAINFALL & SNOW TOTALS • Real-time rain and snow totals at your exact coordinates • Hour-by-hour, daily, monthly, and yearly precipitation breakdowns • Interactive rain calendar — tap any day for hourly detail • Year-over-year precipitation comparisons • Monthly rainfall trend analysis • Custom date range selection for any time period 16-DAY WEATHER FORECASTS • Detailed daily and hourly forecasts • Temperature, wind speed, humidity, and pressure • Severe weather alerts and warnings LIVE WEATHER MAP • Animated radar with rain and snow accumulation layers • Tap anywhere on the map to check precipitation totals instantly CUSTOM RAIN ALERTS • Set rainfall thresholds for each saved location • Get notified the moment precipitation exceeds your limit • Choose your preferred alert time TRACK MULTIPLE LOCATIONS • Save and monitor dozens of locations • Compare precipitation across all your spots at a glance • Search and add any US location in seconds SHARE YOUR DATA • Share rainfall totals and map screenshots with your team, clients, or neighbors FREE TO START Use RainDrop free with your current GPS location. Upgrade to save more locations and unlock full precipitation analytics, extended history, 16-day forecasts, all map layers, custom timeframes, rain alerts, and the interactive rain calendar. Have a question? Chat directly with the developer inside the app. Privacy Policy: https://www.raindrop.farm/privacy-policy Terms of Use: https://www.raindrop.farm/tos
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.
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BUILD KIT DIFFICULTY
Advanced
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.
