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
什么时辰 - 中华极简墨迹万年历老黄历
lunar calendar — traditional wisdom, modern life
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
12 ratings · Top 15%
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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for 什么时辰 - 中华极简墨迹万年历老黄历: map the core Utilities 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 choose themes and layouts for better personalization.
Assumption to check: Limited customization options for calendar display
Validate with people who use this workflow before building.
Hypothesis 2
Implement local caching for offline usability.
Assumption to check: No offline access to calendar data
Validate with people who use this workflow before building.
Hypothesis 3
Provide tooltips or detailed descriptions for each recommendation.
Assumption to check: Lack of detailed explanations for recommendations
Validate with people who use this workflow before building.
Hypothesis 4
Optimize app performance for lower-end devices.
Assumption to check: Inconsistent performance on older devices
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
lunar calendar — traditional wisdom, modern life a beautifully designed chinese almanac that blends heritage with technology. check both solar and lunar calendars with accurate conversion, daily “auspicious & inauspicious” guidance, and festival reminders. includes bazi astrology and hourly fortune analysis to help you choose lucky days and times. covers all official holidays, traditional chinese festivals, buddhist and taoist events, and international holidays. features complete 24 solar terms, 72 phenological periods, three fu days, and nine cold days for seasonal insights. supports dark mode and home screen widgets for a smart and elegant experience. key features: • complete lunar & solar calendar conversion • daily auspicious & inauspicious guide, lucky day search • bazi fortune analysis & hourly luck insight • all legal, traditional, religious & international holidays • 24 solar terms, 72 phenological periods, three fu & nine cold days • dark mode and home screen widgets • clean, ad-free interface
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
React Native
Expo
react-navigation
react-native-async-storage
expo-calendar
TypeScript
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.
