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
StarTracker - Mobile SkyMap
--- Video on YouTube: http://tiny.cc/starvideo ---
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
159 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 included18 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 StarTracker - Mobile SkyMap: map the core Reference 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
Provide detailed descriptions and facts about celestial objects to engage users.
Assumption to check: Limited features for advanced users (e.g., no in-depth star information)
Validate with people who use this workflow before building.
Hypothesis 2
Optimize loading times and reduce lag with effective data handling.
Assumption to check: Occasional performance issues with large data sets
Validate with people who use this workflow before building.
Hypothesis 3
Implement advanced search filters for better user experience.
Assumption to check: Basic search functionality lacking filters
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to customize their map view and favorites.
Assumption to check: Limited customization options
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
--- Video on YouTube: http://tiny.cc/starvideo --- --- Thank you all my dear users to make big success of StarTracker, please leave a review or rating if you love this application! --- TOP 5 Education app in 31 countries when FREE! It's so excited to introduce you the best star gazing app on iOS! This app has a super reaction speed and high accuracy, you must try it out and see how fast it is ;) Just hold up and point the device at the sky to see what stars, constellations and deep sky objects you are looking at in realtime. Full utilization of the build-in gyroscope, digital compass and accelerometer drive the best user experience. Features: • Augmented Reality Star Gazing with gyroscope! Just hold up the device. • Sun, Moon, planets and 8000+ stars visible to the naked eyes. • 88 Constellations & 100+ deep sky objects with magnificent graphics. • All data is offline! • Search and Lock the objects in Solar system, 12 Zodiac Constellations, 88 Constellations, Deep Sky Objects and Famous Stars. • 3D compass in AR mode, indicate position of objects your searched. • Location auto set by GPS, or set manually. • Time Machine. Time and date can be adjusted smoothly. • Capture a screenshot and share with your friends on Facebook, Twitter or save to Photos. (Only share to Twitter on iOS5) • Smooth motion flow and quick response which is realized by cutting edge signal processing technique. • Superb high quality graphic display by enabling the retina display of the device and the full screen anti-aliasing technology employment. Usage: • Buttom Right: Hide/Show Main Setting Menu, settings for name display, constellation, deep sky object, night mode, star amount and grid mode. • Top Right: Search Menu (Solar system, 12 Zodiac and 88 Constellations, Deep Sky Object and Famous Stars) • Top Left: Location Menu, choose location from a world map. • Top bar: Time Machine Menu, adjust any time/date. • Buttom Left: AR Compass indicator in AR track mode, pan the screen to enter un-track mode and click track button to back. Tips: • When search any object under un-track mode, it will be locked at the center of the screen, then user can adjust time/date to see changes of the related sky. • When under un-track mode, just lift up the screen and point it to the sky to enter AR track mode.
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
Zustand
react-navigation
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.
