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
Star & Planet Finder
Star & Planet Finder guides you to see stars, planets, constellations and satellites in the sky.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.2
1,727 ratings · Top 30%
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.
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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/
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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 Star & Planet Finder: 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
Implement offline access for star data with local storage.
Assumption to check: Limited offline functionality for star identification
Validate with people who use this workflow before building.
Hypothesis 2
Provide clearer explanations for in-app purchases and benefits.
Assumption to check: In-app purchase confusion among users
Validate with people who use this workflow before building.
Hypothesis 3
Enhance AR calibration for more accurate star/planet identification.
Assumption to check: Occasional AR inaccuracies
Validate with people who use this workflow before building.
Hypothesis 4
Simplify UI for a more streamlined experience.
Assumption to check: User interface can be cluttered
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
Star & Planet Finder guides you to see stars, planets, constellations and satellites in the sky. Simply choose a planet from the list, and move your device according to the pointer display, the pointer represents the planet. --------------------------------- REVIEWS: "Sanderson - I have dabbled with astronomy for 30 years, star maps, celestial co-ordinates, Patrick moores year book but this app renders them all obsolete. It makes locating stars and planets Childs play!" "I am amazed! - I love this app! It does exactly as promised. Got a telescope for Christmas and hated not know what I was looking at or where to find what I wanted to look at. This app made stargazing a million times better for me and my kids!" "I was thrilled when the cross hairs appeared on screen and Guided me to the planet that I had selected from the list. And that was only the free app!I highly recommend this app for anyone who is curious about the stars above. Well worth the purchase I say." "Tech at it's best! - Awesome program. Any astronomer knows the computational power needed for these algorithms. And the iPhone sensors are up to the task. Unique. Buy it." --------------------------------- FEATURES: - Augmented Reality display - guides you to the chosen star - Compass, GPS, accelerometer, camera and clock aware - All 7 planets including Sun and Moon - All 88 constellations for $0.99 ! - The 300 brightest stars for $0.99 ! - The 150 Brightest Satellites for $0.99 ! - Full Augmented Reality display - Automatic time sync - Moon phase display - Planets information: description, mass, diameter, range - Constellations Maps - Satellite tracking map - Great for astronomy fans
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
Supabase
react-navigation
expo-camera
Zustand
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.
