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
Yi Jing
Ancient oracle meets modern device! Deal with life's challenges more meaningfully
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
913 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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Yi Jing: 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
Provide simplified interpretations and options for different levels of detail.
Assumption to check: Users find interpretation text too complex.
Validate with people who use this workflow before building.
Hypothesis 2
Implement multiple sharing functionalities (social media, email, etc.).
Assumption to check: Limited sharing options for interpretations.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance navigation with clear labels and intuitive icons.
Assumption to check: Navigational structure can be confusing.
Validate with people who use this workflow before building.
Hypothesis 4
Clarify premium features and add a trial period for user testing.
Assumption to check: In-app purchases may feel unclear to users.
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 device! Deal with life's challenges more meaningfully. Tap into your inner self. Find the translation that speaks to you. Ask questions, use the oracle, manage a journal, and browse multiple book translations. Ask questions... * Specify a topic * Enter a question or phrase * Toss coins by shaking * Or manipulate yarrow stalks * Or toss dice * Or use Stephen Karcher's Circle of Protectors * Or navigate Michael Tingle's I Ching Mandala * Or use the Quick option * Or use manual input Manage a journal... * Multi-line questions & notes * Sort by topic, hexagram or date * Search by keyword * Present, Changes and Future * Add your own notes * Switch translations for readings * Mail journal entries Browse the book... * Multiple book translations * Chinese with Pinyin phonetics * King Wen Hexagram numbers * Trigram descriptions * Component Trigrams * Ruling Lines * Related Hexagrams English translations... * A Library tab makes it easy to switch books * "Yi Jing - Book of Transformations" by Brian Arnold, featuring artwork by Elizabeth Nelson * "A Guide to the I Ching" by Carol K. Anthony (English and German) * "Yi Jing / Book of Changes" by Gregory C. Richter * "I Ching Oracle" by Nigel Richmond Other translations... * "Language of the Lines", English (Nigel Richmond) * Original Chinese (two versions) * "I Ging", German (Wilhelm) * "Yi Jing", Japanese (Yo Fujiwara) * "Yi Jing", in French, Spanish, Dutch, Portuguese, Italian, Russian (Arnold) More books for in-app purchase... * "The I Ching or Book of Changes" (Book I, II and III) by Richard Wilhelm * "The Laws of Change" by Jack Balkin * "The Complete I Ching" by Taoist Master Alfred Huang Other key features... * Straightforward and elegant interface * Option to represent coin heads as Yang * Option to cast coins using Yarrow stalk probabilities * Portrait and landscape orientation * Resources to access help and online I Ching resources
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
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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.
