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
My Messier
My Messier is a quick reference of Messier objects: a list of the most famous galaxies, nebulae, and star clusters in astronomy.
$0.99
PRICE
$0.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
3 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 included15 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 My Messier: 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
Competitive pricing with generous free tier
Assumption to check: Expensive subscription
Validate with people who use this workflow before building.
Hypothesis 2
Focus on most-requested features first
Assumption to check: Missing features
Validate with people who use this workflow before building.
Hypothesis 3
Optimize for 60fps, fast load times
Assumption to check: Poor performance
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
My Messier is a quick reference of Messier objects: a list of the most famous galaxies, nebulae, and star clusters in astronomy. Each entry contains essential information for the object, such as size, brightness, and distance, as well as stunning images from the Hubble Space Telescope and other observatories and satellites. No internet connection is required for the basic data and images, but a link is provided to open a Wikipedia page on the object for more information if you do have internet. Convenient for experienced astronomers. Educational for novice stargazers. Impress your friends by instantly accessing facts on the objects they are seeing in your telescope. Make it your personal list by checking off objects you've seen, or intend to. Features: - Information on all 110 objects in the catalog compiled by the 18th century French astronomer Charles Messier. - "About" screen with explanations of the catalog and data. - Support for Apple Watch! Holds information for all of the Messier objects on your wrist, including images. Supports Apple Watch complications for quick access. The object list on the iPhone and Apple Watch shows at a glance the Messier number, object type, and the constellation it appears in, and on the iPhone, a thumbnail image and common name, if any. Select an object in the list for detailed information: For the iPhone and Apple Watch, information includes: - Image of the object. - Alternate designation, such as NGC number. - Common name or nickname, if any. - Type of object: galaxy, nebula, globular cluster, open cluster, etc. - Constellation in which it is found. - Location coordinates in right ascension and declination. - Visual magnitude (brightness). - Apparent size in degrees of arc. - Distance in light years. - An interesting fact about the object. For the iPhone, the app also features: - A link to a Wikipedia article on the object (internet access required). - A checkbox to mark objects you have observed, or wish to observe. - An “about” page for a description of the catalog and data. - Tap on an image to zoom in (most are in high resolution color). A few taps on your iPhone or Apple Watch with the My Messier app will inform, amaze, and help you better appreciate the gems of the night sky.
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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
RevenueCat
BUILD KIT DIFFICULTY
Starter
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.
