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
Rain Tally: Virtual Rain Gauge
Rain Tally is the best app for tracking rainfall totals, setting goals, and exploring past precipitation trends anywhere in the world! Join the thousands of people who trust Rain Tally to help manage their garden, far...
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
372 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.
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 Rain Tally: Virtual Rain Gauge: 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 more flexible input options (e.g., dropdown for common amounts).
Assumption to check: Limited customization options for rainfall data entry.
Validate with people who use this workflow before building.
Hypothesis 2
Integrate more advanced charts and graphs for data insights.
Assumption to check: Lack of detailed statistics visualization.
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to share their rainfall data on social media.
Assumption to check: No social sharing features.
Validate with people who use this workflow before building.
Hypothesis 4
Offer an ad-free subscription model to enhance user experience.
Assumption to check: In-app ads can be intrusive.
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
Rain Tally is the best app for tracking rainfall totals, setting goals, and exploring past precipitation trends anywhere in the world! Join the thousands of people who trust Rain Tally to help manage their garden, farm, and more today! SIMPLIFY YOUR RAINFALL TRACKING View rainfall totals and weather forecasts together on one screen. Stop juggling multiple weather apps and easily plan your garden and farm tasks. Rain Tally is the only rain tracker offering forecast data! SET A WEEKLY TARGET Let Rain Tally keep you updated on how much rain you’ve received compared to your target. Make informed decisions about planting, harvesting, and watering based on actual weather conditions. TRACK RAIN ANYWHERE Enter an address or tap a spot on the map to track rainfall totals at that location. Perfect for places without a street address. TRACK MULTIPLE LOCATIONS With Rain Tally, you can easily follow rainfall totals in multiple locations, helping you prioritize tasks like planting and irrigating to increase farm efficiency. COMPARE RAINFALL OVER TIME Rain Tally shows daily, weekly, monthly, or yearly precipitation totals. See how this year's rainfall compares to past years to figure out when the soil is ready. === UNIQUE FEATURES YOU WON’T FIND IN OTHER RAIN TRACKERS === SPOT THE BEST TIME TO GET THINGS DONE A 3-day hourly forecast shows when it will rain, how much, and the high and low temperatures for each day. Rain Tally helps you decide if today is the best day to plant, water, or harvest or if you should wait. ADD YOUR OWN DATA If the total precipitation amount doesn’t match your rain gauge, you can enter your own rain gauge measurement and compare it to the weather service data. CUSTOM WIDGETS Track or update rainfall totals instantly, right from your Home Screen with Widgets—no need to open the app. Create a custom widget for each location. EXPORT DATA Send your precipitation data to a spreadsheet to take a closer look. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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
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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.
