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
Nine Star Ki Astrology
Nine Star Ki Astrology Pro app by Master Joseph Yu.
$54.99 · In-app purchases
PRICE
$54.99
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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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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Nine Star Ki Astrology: map the core Lifestyle 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
Incorporate social sharing and community features.
Assumption to check: Lack of user engagement features such as community or connectivity
Validate with people who use this workflow before building.
Hypothesis 2
Provide more personalized content based on user input.
Assumption to check: Limited personalization for users
Validate with people who use this workflow before building.
Hypothesis 3
Introduce a freemium model with limited features to attract more users.
Assumption to check: High price point for the app
Validate with people who use this workflow before building.
Hypothesis 4
Add ratings and reviews for readings to improve user experience.
Assumption to check: No user feedback mechanism
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
Nine Star Ki Astrology Pro app by Master Joseph Yu. - The Most Ancient Chinese Astrology - Want to learn the professional Method, “Nine Star Ki”, Jiu Gong Ming Li 九宮命理 “Nine Palaces Destiny Analysis”, written by Master Joseph Yu. The Nine Star Ki professional app, is an introductory course that guides you step by step through the secrets of the Nine Stars 九星. A few words from the Master Yu: “Perhaps one of the best entertainment for ancient people was to watch the Sky at night. This led to two branches of studies: Astronomy and Astrology. The most noticeable Stars for the ancient Chinese were the Nine Stars (九星) in the Great Dipper 北斗星. These Nine Stars were brought to a one-to-one correspondence with the numbers 1 to 9 in the magic square which is known as the Luo Shu 洛書 in China. In this app I am trying to explain how the Ancient Chinese used these Nine Stars to Study the Life of People. Legend says that the Luo Shu was discovered by Yu the Great 大禹 when he was controlling the floods of the Yellow River. Besides, the Nine Star Ki has a strong reference to the Directional movements. It can be applied effectively in the Daily, Monthly and Yearly basis. This can help people stay away from unnecessary danger. Directionology can help people to live a life in harmony with the Qi of the Universe. Let us enjoy this simple but fascinating Astrology.” This Application Includes: In this application you can very easily with a few clicks, find your 3 Personal Stars, the Year, the Month and the Hour of your birth. In the app, Master Joseph Yu gives the authentic technique to obtain the 3rd Star. Of course there is also the option if you want to use the Japanese 3rd Star acquisition calculation method. - The Nine Stars - Annual, Month Squares - Your Stars in the 9 Palaces - Nine Stars and Directionology - Analysis of a Nine Ki Chart - Finding Your Ki Numbers - 12 Earthly Branches - Year & Month, Life Sha - Year & Month, Life Focus Sha - Year & Month, Five Yellow Sha - Year & Month, Secret Sword Sha - Analysis of Nine Types of People - Luck Years Analysis : Your Birth Ki Star through the Luo Shu Palaces
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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 Navigation
Zustand
React Native SVG
Expo Sharing
Axios
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.
