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
DayLight: Last Usable Light
When will it really get dark?
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
213 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 DayLight: Last Usable Light: 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 advanced radar with customizable overlays.
Assumption to check: Limited radar features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Enhance location services for better accuracy.
Assumption to check: Inconsistent location accuracy
Validate with people who use this workflow before building.
Hypothesis 3
Implement user preferences for themes and widgets.
Assumption to check: Lack of customization options for users
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to customize notification settings.
Assumption to check: Notifications can be overwhelming
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
When will it really get dark? Sunset is not the end of light. Sometimes it stays bright long after sunset. Sometimes darkness comes much sooner. DayLight shows how much usable light is really left. Instead of a single sunset time, you see the full light progression: • first light • sunrise • daylight • sunset • twilight • darkness Most apps only show sunset times. DayLight helps you understand when it will actually get dark outside. So you can decide: • whether to go out • how much time you still have • when to head back Features: • Remaining light time • Clear day dial • End of light estimate • Smart notifications • Widgets • Apple Watch Perfect for: • walks • hiking • outdoor time • daily planning With DayLight, you always know how much usable light you still have left. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ For more information, please review our Privacy Policy: https://michals.app/apps/daylight/PrivacyPolicy.html
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.
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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.
