App Overview

Weathergraph weather widget icon

Weathergraph weather widget

Tomas Kafka · Weather

I built Weathergraph to be the weather app I always wanted — clear visual forecasts, professional-grade data, and zero tracking.

Free · In-app purchases

PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
4.2
507 ratings · Top 30%

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 included17 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.

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.

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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Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Weathergraph weather widget: 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

Offer a wider variety of customizable widgets with different styles and data points.

Assumption to check: Limited customization options for widgets

Validate with people who use this workflow before building.

Hypothesis 2

Utilize multiple weather data sources for improved accuracy.

Assumption to check: Inaccurate weather forecasts in some regions

Validate with people who use this workflow before building.

Hypothesis 3

Implement push notifications for severe weather alerts.

Assumption to check: No severe weather alerts

Validate with people who use this workflow before building.

Hypothesis 4

Allow users to view previously saved weather data offline.

Assumption to check: Lack of offline capabilities

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

I built Weathergraph to be the weather app I always wanted — clear visual forecasts, professional-grade data, and zero tracking. YOUR PLACES, ALL IN ONE APP Save home, the mountains, your next trip — any place you care about. Switch between them with one tap for the full 7-day detailed forecast, with your choice of weather source. WHY OUTDOOR ENTHUSIASTS LOVE WEATHERGRAPH • Up to 7 days of hour-by-hour data in a single glanceable chart — temperature curve, rain bars, wind, clouds, and sunshine in one timeline • Widgets with real graphs for Apple Watch, iPhone, iPad, and Mac • Know exactly when rain starts: “Light rain 2:30–3:15 PM,” powered by Rainbow.ai radar + ML — perfect for runners, cyclists, and ski trips • Rain alerts up to 60 min ahead — plan your workout, hike, or fishing trip with confidence • Built for kite surfers and sailors: wind speed + gusts, direction, pressure trends, UV peaks, heat index • Works offline — forecast cached for 24 hours, even in the mountains or on travels • Privacy-first — no accounts, no ads, no tracking, no data sharing SEE YOUR WEATHER AT A GLANCE Weathergraph turns raw weather numbers into a visual narrative: • Temperature as a smooth gradient line — spot the warmest hour for your bike ride • Rain & snow as blue bars — taller bars = heavier precipitation • Sunshine breaks as real sun-rays between clouds — find the best window to head out • Wind with gusts and direction arrows • UV index curve — know when to apply sunscreen (hint: above 3) • Barometer trends to understand pressure-driven changes • Background color follows the sky from dawn blue to sunset orange • Today’s highs and lows marked directly in the chart • Sunrise/sunset times with twilight shading APPLE WATCH APP DONE RIGHT • The only weather app with full hourly graphs on your watch face • Rich complications for every weather metric you care about • Caches your forecast for 24 hours — even offline on a mountain ridge WIDGETS THAT ACTUALLY HELP • Large widget with the nowcast, hourly charts, and up to a week of weather • Quick-glance widgets: UV with sunscreen reminder, wind with direction arrow, dew point & comfort scale, sunrise & sunset … • Lock screen widgets — see the detailed forecast before you even unlock • Stack several for your morning weather briefing TRUSTED DATA SOURCES Apple Weather · Rainbow.ai (world-class radar + ML nowcast) · Foreca · Open-Meteo (and its many national forecast models) · Pirate Weather (NOAA’s HRRR, GFS and GEFS) · yr.no Pilots and surfers check the wind graphs before takeoff. Photographers plan golden hour. Skiers know when exactly the blizzard starts. Golfers, anglers, and drone pilots time their sessions; stargazers watch for clear skies. If you loved Dark Sky or Weather Line, you’ll feel right at home. Weathergraph is free to download and use — beautiful, detailed forecasts from the world’s best weather models, no ads, no accounts. Upgrade to Pro to unlock widgets, Apple Watch complications, multiple saved locations, background rain alerts, and full customization. Pro comes with a 7-day free trial, then an annual membership or a one-time lifetime purchase. PRIVACY POLICY AND TERMS OF USE: https://weathergraph.app/privacy Please note: Subscriptions made on Apple devices will be charged to your credit card through your iTunes account. Your subscription will automatically renew unless canceled at least 24 hours before the end of the current period. You will not be able to cancel once activated. Manage or turn off your subscriptions in App Store app > Account > Subscriptions.

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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.