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
Starlight® - Explore the Stars
Point your iPhone or iPad like a magic lens into the night sky, and see in real time what stars, planets, and constellations hover above
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
3,165 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 Starlight® - Explore the Stars: map the core Education 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
Include offline caching for star maps and celestial data.
Assumption to check: Limited offline functionality for star maps.
Validate with people who use this workflow before building.
Hypothesis 2
Add in-depth content and multimedia for each object.
Assumption to check: Lack of detailed explanations for celestial objects.
Validate with people who use this workflow before building.
Hypothesis 3
Implement a cleaner UI with better spacing and organization.
Assumption to check: User interface can feel cluttered with too much information.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce social sharing features to engage users.
Assumption to check: No social sharing options for discoveries.
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
Point your iPhone or iPad like a magic lens into the night sky, and see in real time what stars, planets, and constellations hover above. Stargazing has never been so easy! This app is a streamlined starmap that is gorgeous to look at. See constellations come to life against a vibrant backdrop of stars, each colored according to their actual stellar classification. Track the movement of planets. See the phases of the moon. Discover detailed information about stars. Amaze your friends and educate your kids with this impressive app. FEATURES: * New Augmented reality mode! * Information at your fingertips. Learn about stars and planets. Discover trivia connecting stars to some of your favorite science fiction Learn the folklore behind constellations. * Lightning-fast navigation. * Over 100,000 stars from the Hipparcos database, painted accurately according to their spectral type. * All 88 western constellations. * Planets of the solar system. * See a real-time map of the sky, day or night. * Detailed information on hundreds of celestial objects from stars to planets to solar system objects. * Powerful zoom feature allows you to pinpoint star clusters and examine planets. * View the sky beneath the horizon. Know where the sun is, even at night! * Supports both motion and touch navigation. Point your device at the sky and the app will track what you see. _______________________________________ Starlight is an ever-expanding tour of the Cosmos with new content planned regularly.
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
@react-navigation/native
axios
expo-location
react-native-reanimated
BUILD KIT DIFFICULTY
Advanced
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.
