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.
Live by the Sun! See not only the Sunrise and Sunset times but also the First and Last Light times for exactly where YOU are right now – not the "closest" city
$9.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Sunset and Sunrise 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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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
Assumption to check: Limited location data for some areas
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No notifications for sunset/sunrise
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of customization options
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: In-app purchases can be confusing
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Live by the Sun! See not only the Sunrise and Sunset times but also the First and Last Light times for exactly where YOU are right now – not the "closest" city. See exactly how much daylight is left in the day - in a large, simple, easy to read display - so you can plan ahead to the last speck of daylight. Both iPhone and iPad support is included in the price. This IS the app you are looking for! It shows: • Sunrise time • Sunset time • First Light time (Dawn) • Last Light time (Twilight end) • Amount of daylight in the day • 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 • See the Sunrise, Sunset, First and Last light times for any day in the future. • Correctly handles Daylight Savings time. • Access to your location by the app is completely optional. • Resizable text using iOS's Dynamic text accessibility feature. • VoiceOver and Voice Control compatible. *** What our reviewers said: "I use it least 3 or 4 times a week and it's nice and accurate. Invaluable for any time-pressed gardener!" "Handy tool for planning when to fish." "...Now I can time my walks to finish the walk well before sundown... Highly recommend " "Simple but effective app. As a photographer I use it all the time." "Thank you for this app - I love it!" Don't believe us? Look at our reviews in the app store! 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 - thank you for your great ratings and reviews :)
Written user reviews are not shown here. Check current App Store reviews >
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.