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
The I Ching or Book of Changes
Ancient oracle meets modern classic! Explore an interactive English version of "The I Ching or Book of Changes" by Richard Wilhelm, edited by Hellmut Wilhelm, and translated by Cary F
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
165 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 included18 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 The I Ching or Book of Changes: map the core Entertainment 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 in-depth explanations and examples for each hexagram.
Assumption to check: Limited guidance on interpreting hexagrams
Validate with people who use this workflow before building.
Hypothesis 2
Create a clearer, user-friendly paywall with trial options.
Assumption to check: In-app purchase process can be confusing
Validate with people who use this workflow before building.
Hypothesis 3
Introduce community features like sharing readings and insights.
Assumption to check: Lack of user engagement features
Validate with people who use this workflow before building.
Hypothesis 4
Enable offline access to favorite hexagrams and readings.
Assumption to check: No offline access to hexagrams
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
Ancient oracle meets modern classic! Explore an interactive English version of "The I Ching or Book of Changes" by Richard Wilhelm, edited by Hellmut Wilhelm, and translated by Cary F. Baynes, using a coin oracle or yarrow stalks, and an integrated journal. NOTE: The text is only in English. The I Ching, or Book of Changes, a common source for both Confucianist and Taoist philosophy, is one of the first efforts of the human mind to place itself within the universe. It has exerted a living influence in China for 3,000 years, and interest in it has been rapidly spreading in the West. “Princeton's Bollingen edition—still regarded as the best and most authentic by I Ching aficionados.” The complete work is available in three books. Book I is included with the I Ching or Book of Changes app. Book I includes Judgments pertaining to the diagrams as a whole, the line texts, and the Great Images. Book II and III are available for additional in-app purchase. Book II: The Material Contains the Shuo Koa and the Ta Chuan from the Ten Wings, plus The Structure of the Hexagrams. Book III: The Commentaries Contains passages from the Ten Wings considered commentary to the texts, and On Consulting the Oracle. Text © 1950, 1967, renewed 1977 by Princeton University Press. Used with permission. Additional features: Coins, yarrow stalks, quick and manual input oracle methods Integrated journal for questions and notes Component trigrams Related Hexagrams
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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
Axios
React Navigation
Async Storage
Shadcn/ui
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.
