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
Dark Sky Meter Pro
Dark Sky Meter Pro turns your iPhone’s camera into a sky brightness meter
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 included20 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 Dark Sky Meter Pro: 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
Add gamification elements like badges for stargazing.
Assumption to check: Limited user engagement features.
Validate with people who use this workflow before building.
Hypothesis 2
Implement offline access for key features.
Assumption to check: Insufficient offline capabilities.
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to share stargazing experiences on social media.
Assumption to check: No social sharing options.
Validate with people who use this workflow before building.
Hypothesis 4
Enable user customization for tips and notifications.
Assumption to check: Lack of personalization.
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
Dark Sky Meter Pro turns your iPhone’s camera into a sky brightness meter. Point at the night sky to get scientific readings in SQM (magnitudes per square arcsecond) and Bortle scale, plus NELM (naked-eye limiting magnitude) and an estimate of visible stars—so you can track light pollution and compare sites. Measure One-tap measurement: cover the lens for a dark frame, then point at the sky. Results in seconds. Device-specific calibration (zero point) for better accuracy; optional FOV setting (default 20° for SQM-style comparison). Readings include location and time for your records. My Data Save measurements locally and, with Sign in with Apple, sync across your devices. Export to CSV for analysis or sharing. Review history with SQM, Bortle, NELM, and location. Clouds Simple cloud forecast for your location so you can plan when to go out. Map See your (and optionally others’) measurements on a map to compare sky quality by place. Info Sunrise, sunset, and darkness window; moon phase, moonrise, and moonset for your location. Built for stargazers, astrophotographers, researchers, and anyone curious about light pollution and dark skies. No extra hardware—just your iPhone.
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
axios
victory-native
react-native-maps
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.
