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 Guide: Night Sky Map
Turn your phone into a real‑time planetarium
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
4,224 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.
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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 Guide: Night Sky Map: 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 a more intuitive navigation system with quick access to favorites.
Assumption to check: Users often find navigation between constellations cumbersome.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to download maps and star data for offline use.
Assumption to check: Limited offline functionality for star identification.
Validate with people who use this workflow before building.
Hypothesis 3
Optimize the map rendering process for better performance.
Assumption to check: The app can be slow in rendering the sky map during peak usage.
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate detailed articles and videos about astronomy within the app.
Assumption to check: Users desire more educational content about stars and constellations.
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
Turn your phone into a real‑time planetarium. Star Guide helps you explore the night sky, identify stars and planets, and plan the best moments to look up—whether you’re stargazing tonight or previewing the sky months from now. Point your device upward to see what’s above you, switch on Augmented Reality (AR) for an immersive sky overlay, and explore celestial objects in 3D. Want to plan ahead? Travel through time to see how the sky changes in the past or future, and preview the view from different locations around the world. Key features • Live star finder & planetarium view Explore the night sky based on your position and direction. • Augmented Reality mode Overlay stars and planets on your camera view for easy identification. • 3D stars & planets Visualize objects in a more immersive way and explore in 3D. • Best viewing time notifications Get alerts for great stargazing moments and upcoming viewing opportunities. • 24‑hour sky motion preview See how a star moves and circles across the sky over a full day. • Past & future sky “time travel” Rewind to previous nights or fast‑forward to plan future observations. • Different locations Change your location to preview the sky from other places—perfect for trips. Great for • Casual stargazing from your backyard • Learning the night sky with an interactive planetarium • Planning the best time to spot planets • Exploring how the sky looks from other cities and countries Permissions (why they may be requested) • Location: improves sky accuracy for your current position • Camera: required for AR mode • Notifications: optional alerts for best viewing times Download Star Guide and start exploring the sky—right from your pocket.
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
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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.
