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
Spot the Station
For anyone who has ever gazed up at the night sky and wondered about the mysteries of the universe, witnessing the International Space Station pass overhead can be an awe-inspiring moment
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
9,922 ratings · Top 5%
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 included19 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 Spot the Station: 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 caching of upcoming passes.
Assumption to check: Limited offline functionality for tracking passes
Validate with people who use this workflow before building.
Hypothesis 2
Add gamification elements to encourage tracking and notifications.
Assumption to check: Lack of user engagement features
Validate with people who use this workflow before building.
Hypothesis 3
Allow custom notifications based on user preferences.
Assumption to check: Notifications can be overly simplistic
Validate with people who use this workflow before building.
Hypothesis 4
Simplify UI and enhance user experience by reducing unnecessary elements.
Assumption to check: User interface may feel 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
For anyone who has ever gazed up at the night sky and wondered about the mysteries of the universe, witnessing the International Space Station pass overhead can be an awe-inspiring moment. The Spot the Station mobile app is designed to notify users when the space station is visible overhead from their location. It aims to broaden access and awareness of the station and NASA globally, by providing users with an opportunity to experience the wonder of the space station firsthand. The realization that there are human beings living and working in that tiny dot, orbiting the Earth at a mind-boggling speed of 17,500 miles per hour, is breathtaking. The app includes several helpful features including: 1. 2D & 3D real-time location views of the station 2. Upcoming Sighting Lists with visibility data 3. Augmented Reality (AR) view with compass and trajectory lines embedded into the camera view 4. Up-to-date NASA space station Resources & Blog 5. Privacy Settings 6. Push Notifications when the station is approaching your location.
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.
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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.
