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.
Point your iPhone to the sky and explore the movement of the sun, moon, planets and stars across the sky while you change time by swiping the display
$1.99 · 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 Sun & Moon 3D Planetarium Pro: 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 customization options for user locations.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: In-app purchase for premium features may lead to user dissatisfaction.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Performance issues with the 3D models on older devices.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of notifications for significant astronomical events.
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.
Point your iPhone to the sky and explore the movement of the sun, moon, planets and stars across the sky while you change time by swiping the display. You can even change your location -- wondering how the sky looks where there's midnight sun? Or try setting your location to the other side of the equator and watch the sky rotating in the opposite direction. Even watch through your phones camera, by toggling the AR-button. When do solstices and equinoxes occur? Find out with this app! Even get a notification when they occur. Get a notification when the sun sets. Waiting for full moon? Get notified when it occurs. Predict lunar and solar eclipses and simulate the earth's shadow across the moon by simply swiping across the moon in the eclipses view! ••• You need this app -- get it now! ••• • Predict the positions of the sun, the moon, or the planets for any time for any position on Earth. • Sunrise, sunset for any given date - just swipe the sky view. Click on date or clock symbol to go back to current time. • In the Sun tab, scroll through the days and notice the the sunrise and sunset times changing. • Moonrise, moonset for any given date. • Solar System view. • Click on map symbol to choose a new location on a map. • Notifications • By swiping the sky view, you change the time and date • Swipe fast (fast forward/rewind in time) by using three fingers. • Swipe with two fingers to change orientastion • Tap on the info text to hide it for better view. • Pinch or tap to zoom Notifications • Notifications notify you of sunset, sunrise, new moon, full moon, solstice, equinox (the sun passes equator and day and night have nearly equal length), and these can be turned on or off. Sunset notification can be sent 30 minutes before sunset. • Choose in Settings which notifications you would like and which you would like to turn off. • No unsolicited notifications! Only notifications related to sunsets, solstices, equinox etc. Share Button • Share to friends and involve them in the fascinating world of Sun and Moon watching. Change View • You can change between Sky View and Space View, where each cellestial body's position in space is carefully and correctly calculated, however distance and sizes of sun and moon have been resized to make them visible. The moon phase text field shows the moon's illumination, and if the moon is in the Earth's shadow it changes to Lunar Eclipse (0-100 %), and if the moon covers the sun for your position, the text changes to Solar Eclipse (0-100 %.) See how sunrise and sunset times differ for various places and dates. It will work with no network coverage, and in flight mode, however showing your location as an address requires internet connection. With no internet, timezones are off, so if you simulate the sky from another location on Earth, the times are your local time. Showing map requires internet connection. Showing the satellite view on ground requires internet connection. Don't forget to leave a review, to help others find this fantastic app! And remember, never look directly at the real sun. Have fun using the app! Disclaimer. This app calculates the sun and moon positions very accurately with an error margin of up to 0.03°, which is good in most cases, however, always refer to table values for most accurate calculations of solar eclipse and the like, since they require more powerful calculations. The sun and the moon have an angular diameter of approximately 0.5°, and with an error margin of 0.03° each, eclipse times may be calculated with an error margin of ± 10 minutes.
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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.