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
河洛理數
相傳河洛之法創自陳摶、卲雍，以生時干支入河圖洛書，推其天地陰陽之數以起卦，數統先天，而卦運後天，起運推卦，以至於年月日，則一生之氣數卦運，絲毫畢現。然此可謂命術之中，至為正大者，其以卦推命，並非欲限人之命運於一卦之內，而是於卦象之中，示人以當往之地、當行之事、當斷之機、當明之理也。此則貴如千金，故先賢有知此法者，常訂本年本月之卦象於房內，日夜觀省，淺可以決事，深則能修德。此與近世子平八字之術大為不同，近世子平能斷人之生旺興衰，卻不...
$39.99 · In-app purchases
PRICE
$39.99
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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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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for 河洛理數: 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 explanations and tutorials for better user engagement.
Assumption to check: Users find it hard to understand numerology concepts.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to customize their profiles and preferences.
Assumption to check: Limited user personalization options.
Validate with people who use this workflow before building.
Hypothesis 3
Implement a discussion forum for sharing experiences.
Assumption to check: Lack of community features.
Validate with people who use this workflow before building.
Hypothesis 4
Offer a clear trial period with easy cancellation options.
Assumption to check: No clear free trial or money-back guarantee.
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
相傳河洛之法創自陳摶、卲雍，以生時干支入河圖洛書，推其天地陰陽之數以起卦，數統先天，而卦運後天，起運推卦，以至於年月日，則一生之氣數卦運，絲毫畢現。然此可謂命術之中，至為正大者，其以卦推命，並非欲限人之命運於一卦之內，而是於卦象之中，示人以當往之地、當行之事、當斷之機、當明之理也。此則貴如千金，故先賢有知此法者，常訂本年本月之卦象於房內，日夜觀省，淺可以決事，深則能修德。此與近世子平八字之術大為不同，近世子平能斷人之生旺興衰，卻不能予人掌握自身命運之法，四柱八字之下，大運流年之中，常人令人覺自身命運皆已生定，不作努力之想。而張口問命，也只欲知眼前運勢如何，告之旺則喜，衰則哀，不知運勢之來，其根源全然在己，五行甲子，不過載運之器爾。故河洛卦象可貴之處，正在於此，雖河洛之法亦重氣數，但其總歸，只在於卦。歷久以來，人只知算卦，卻不知用卦，若知用卦，則福德之基，全在於此。 故今將河洛之法制成掌中之軟件，生時生地一定，便可起卦，而先天後天，大運流年，以及月日之卦象皆可方便觀之。而古之卦辭，或與人之命運不甚相合，因此將自為其觀象得辭，漸次更新，使人觀辭便可解象，縱然不通卦象之人，也能因卦而知所當行之事，當明之理，人生正途，不過如此。 本款App起課簡便，輸入地點便可自動解析地理信息，並推算真太陽時以定四柱，亦可自行判斷處理夏令時，全球範圍皆可通用。如起課不以真太陽時定時刻，則萬難應驗。以北京與成都而言，二者相差十三度有餘，雖同用一標準北京時間，但實際往往北京已入辰時，而成都尤在卯時，兩者時間實際相差三刻有餘，故必以真太陽時起課方有准。
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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
FastAPI
Axios
Zustand
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.
