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.
Take Control of Your Bitcoin Future
$1.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for LumenBTC: map the core Finance workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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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
Assumption to check: Limited customization options for transactions and wallets
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of advanced analytics features
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No integration with external wallets or exchanges
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: User onboarding process can be confusing
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Take Control of Your Bitcoin Future LumenBTC is the most comprehensive Bitcoin portfolio tracker and retirement planning app available. Whether you're HODLing for the long-term or planning your financial independence, LumenBTC gives you professional-grade tools in a beautiful, intuitive interface. TRACK YOUR PORTFOLIO - Monitor Bitcoin prices in 157+ currencies - Track multiple wallets with real-time valuations - Interactive price charts with multiple timeframes - Pull-to-refresh for instant updates - Clean, distraction-free interface PLAN YOUR RETIREMENT - Advanced retirement calculator with year-by-year projections - Choose from 7 sophisticated growth models (CAGR & Power Law) - Based on Bitcoin's True Market Mean (rolling 12-month average) - 4% withdrawal rule based on Trinity Study - Inflation-adjusted calculations - See exactly when you can retire STRESS TEST YOUR PLAN - Test 30%, 50%, and 80% drawdown scenarios - Understand how market crashes affect your timeline - Historical context from Bitcoin's past bear markets - Build a resilient long-term strategy CALCULATE EMERGENCY FUNDS - Determine your safety net target (6-12 months expenses) - Optimize Bitcoin vs cash allocation - Track your progress with visual indicators - Separate from retirement planning OPTIMIZE TAX STRATEGY - Capital gains tax calculator - Compare FIFO vs LIFO methods - Estimate tax owed on sales - Plan your exit strategy wisely SAVE & COMPARE SCENARIOS - Create multiple retirement plans - Save different "what-if" scenarios - Compare strategies side-by-side - Find your optimal path EXPORT BEAUTIFUL REPORTS - Generate professional PDF reports - Complete with year-by-year projections - Share with financial advisors - Keep records for your planning WHY LumenBTC? - No ads, no tracking, no subscriptions - All data stored locally on your device - No account or email required - Professional-grade calculations - Haptic feedback on every interaction - Accessible design for everyone - Works offline with cached data - Dark theme optimized for OLED PRIVACY FIRST Your Bitcoin addresses and portfolio data never leave your device. No cloud sync, no servers, no data collection. Complete privacy and security. WHO IS THIS FOR? Long-term Bitcoin investors planning retirement - HODLers who want to track their stack - Financial independence seekers - Anyone serious about Bitcoin wealth building TECHNICAL EXCELLENCE Built with React Native and Expo for rock-solid performance across iOS. Sophisticated growth models including CAGR declining rates and Power Law projections. Real Trinity Study implementation for withdrawal planning. NOTE: This app is for informational purposes only and does not constitute financial advice. Bitcoin is volatile. Past performance does not guarantee future results. Consult a financial professional for personalized guidance.
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.