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
Sunsethue
Sunsethue is finally coming to your iPhone or iPad! Access the sunrise and sunset forecasts for the coming days for free through the Sunsethue mobile app
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
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 included16 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 Sunsethue: 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
Use a reliable weather API with frequent updates.
Assumption to check: Inaccurate weather data or delays in updates
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to set personalized alerts for specific weather conditions.
Assumption to check: Limited customization options for alerts
Validate with people who use this workflow before building.
Hypothesis 3
Focus on a clean design with essential features prioritized.
Assumption to check: Cluttered interface with too many features
Validate with people who use this workflow before building.
Hypothesis 4
Implement caching for offline access and improve loading times.
Assumption to check: Poor performance in low connectivity areas
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
Sunsethue is finally coming to your iPhone or iPad! Access the sunrise and sunset forecasts for the coming days for free through the Sunsethue mobile app. Know if it will be worth going out in a glance through Sunsethue’s quality forecasts, or explore the more in-depth features like cloud cover, sun visibility, rarity and uncertainty. With Sunsethue Alerts (paying feature) you’ll get notified when the sunrise or sunset is forecasted to be above your preferred threshold, so you’ll never miss an amazing sunset again! Features (available for free, without an account): - Sunrise and sunset quality forecasts for up to three days ahead - Forecasts are made by Sunsethue’s ray-based model - Available for locations all over the world - More information regarding each sunrise/sunset: time, golden hour, blue hour and cloud cover - Advanced features to get even more insights: sun visibility at horizon, rarity and uncertainty Sunsethue Alerts (paying): - Get notified when the upcoming sunrise or sunset is forecasted to be above your preferred threshold - You choose the quality threshold, location and timing of your alerts - Available through an annual subscription or lifetime option - Even more features in the future: widgets and maps are coming this year! No account, payment or any permissions needed to access the core features of the app. An account and payment through the App Store is needed to sign up for Sunsethue Alerts. The yearly subscription version of Sunsethue Alerts is renewed automatically, unless you cancel 24h beforehand through the Apple App Store. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula (standard Apple Terms of Use) Privacy Policy: https://sunsethue.com/privacy
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
React Navigation
Redux
Day.js
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.
