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
Dawn and Dusk
Sunrise and sunset anywhere on Earth
$5.99 · In-app purchases
PRICE
$5.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
27 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.
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'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 Dawn and Dusk: map the core Health & Fitness 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 integrations with HealthKit and Google Fit for enhanced data tracking.
Assumption to check: Limited integrations with other health apps or devices
Validate with people who use this workflow before building.
Hypothesis 2
Simplify onboarding with clear instructions and interactive tutorials.
Assumption to check: User onboarding can be confusing
Validate with people who use this workflow before building.
Hypothesis 3
Add social sharing and challenges to foster community engagement.
Assumption to check: Lack of social features for user engagement
Validate with people who use this workflow before building.
Hypothesis 4
Provide a free trial to allow users to experience premium features before purchasing.
Assumption to check: Premium features may not justify the price
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
Sunrise and sunset anywhere on Earth. Dawn and Dusk is designed to improve the sunrise and sunset experience, and build rituals to experience more of them. Our biology is deeply connected to the sun. The transition from morning darkness to early dawn, and from evening dusk into nighttime darkness, are cornerstones to our biological clock. When we are getting exposure to these moments outside, humans are healthier. And when we build daily rituals around these moments, we can unlock more of our human potential. Two useful reminders for each day's sunrise and sunset, using your location you move around the world. Comes with a weather flip book of beautiful charts to help plan time outside at a glance. Dawn and Dusk also includes features like Sunrise Alarm, Streaks, Community Gallery, and more. Built for iPhone, No ads, no accounts, no data collected, one-time purchase. -- "The only app I use in the mornings" "It's like a prayer bell for the sun" "How much would you pay to experience even one additional sunrise or sunset?"
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
Zustand
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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.
