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
Sunrise Sunset Times
Live free in the Sun! An elegant and modern solution for showing the Sunrise, Sunset, First and Last Light times to the exact minute for precisely where YOU are right now - not the "closest" city
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
19,398 ratings · Top 5%
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 Sunrise Sunset Times: 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
Implement automatic location detection and suggestions.
Assumption to check: Limited location support and manual input can be cumbersome.
Validate with people who use this workflow before building.
Hypothesis 2
Provide an ad-free subscription option.
Assumption to check: Ads can be intrusive, affecting user experience.
Validate with people who use this workflow before building.
Hypothesis 3
Integrate comprehensive weather data for better user insights.
Assumption to check: Lack of detailed weather conditions beyond sunrise and sunset.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance notification settings for more accuracy and user control.
Assumption to check: Notifications can be unreliable or poorly timed.
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
Live free in the Sun! An elegant and modern solution for showing the Sunrise, Sunset, First and Last Light times to the exact minute for precisely where YOU are right now - not the "closest" city. The app also shows exactly how much daylight is left in the day - in a large, easy to read display - so you can plan ahead to the last ray of sunlight. Download it now. It shows: • Sunrise time • Sunset time • First Light time (Dawn) • Last Light time (Twilight) • A full Sun Events timeline: astronomical, nautical and civil twilight times, solar noon, and the current time moving through the day (Premium) • Converts timezones for foreign locations • Counts down the amount of daylight left in the day until last light • At night, counts down the time left until the first light of the new day • Counts down days, hours and minutes left until the shortest and longest days • Dates of the equinox and solstice • Times of the equinox and solstice for premium users • Many widgets available • Very accurate timezone conversion and handling, local times anywhere in the world • Correct handling of locations where the sun may not rise or set • See the Sunrise, Sunset, First and Last light times for any day in the future. • Length of daylight for today - or any day in the future. • Percentage of the day or night completed. • Correctly handles Daylight Saving times. • GPS access is not required. • Landscape support on iPad. An indispensable tool for those who don't want to waste a moment of the day - or the night! • We wrote this app for ourselves, but love sharing it and getting your positive feedback. Visit our support site to give us feedback - thank you in advance for your great ratings and reviews :) Terms of Use : https://fascinatingprojects.com.au/termssunrisefree/
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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
React Native
Expo
Axios
React Navigation
React Native Async Storage
BUILD KIT DIFFICULTY
Starter
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.
