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
九星方位盤
九星気学を元に本命星から見た日々の方位盤を表示するアプリです。
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
5 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 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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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 九星方位盤: 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
Allow users to customize chart appearance and features.
Assumption to check: Limited customization options for charts
Validate with people who use this workflow before building.
Hypothesis 2
Introduce a freemium model with more free features.
Assumption to check: Subscription model may deter users
Validate with people who use this workflow before building.
Hypothesis 3
Implement guided onboarding for first-time users.
Assumption to check: Navigation can be confusing for new users
Validate with people who use this workflow before building.
Hypothesis 4
Add functionality for users to share their charts on social media.
Assumption to check: No social sharing options
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
九星気学を元に本命星から見た日々の方位盤を表示するアプリです。 年盤、月盤、日盤を表示します。 下記の凶方位を表示します。カッコ内の漢字が実際に表示されます。 ・(五)五黄殺 ・(暗)暗剣殺 ・(本)本命殺 ・(的)本命的殺・(破)歳破・(破)月破・(破)日破 九星の相性の良い方位を吉方位として表示しています。 流派によって吉凶判断が違いますので吉凶表示に関しては 九星の位置から判断していただくことを前提に参考程度に表示 しています。 入力した生年月日の履歴が残せます。 現在地を登録することが出来ます。 日の九星については日本で一般的なものを採用しています。 一般的な方位盤では南を上にすることが多いですが、このアプリでは 地図に合わせて北が上になっています。 地図上の現在地、又は登録位置に方位盤を表示することができます。 IPhone Mapkit で表示した地図に方位盤を表示しています。 方位に関しては距離が遠くなるほど方位に誤差がでますので 参考程度にご使用ください。 又、仕様環境によっても誤差が出る場合があります。 (地図を表示する場合はIPhoneの設定で位置情報をオンにしてください。 機種によりWifiが使用できる環境がないと位置情報が取得できません)
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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
Zustand
react-native-share
expo-router
react-native-swipeable
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.
