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
Buffett Mars Index
Buffett Mars Index(BMI) cuts through market noise with two valuation models: the time-tested Buffett Buy Model and the forward-looking Mars Index, based on AI leadership.
$0.99 · In-app purchases
PRICE
$0.99
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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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included16 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 Buffett Mars Index: 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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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
Implement advanced filtering and sorting options for assets.
Assumption to check: Users find it challenging to track multiple investments efficiently.
Validate with people who use this workflow before building.
Hypothesis 2
Add a feature for detailed market analysis and reports.
Assumption to check: Limited insights on market trends.
Validate with people who use this workflow before building.
Hypothesis 3
Introduce a forum or chat feature for users to discuss strategies.
Assumption to check: No community interaction or support.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance UI with modern design principles and animations.
Assumption to check: Basic user interface may not be engaging.
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
Buffett Mars Index(BMI) cuts through market noise with two valuation models: the time-tested Buffett Buy Model and the forward-looking Mars Index, based on AI leadership. WHAT BMI DOES — Analyzes all S&P 500 stocks live, instantly classifying each as Deep Value, Fair Value, or Overvalued — Calculates a Buffett Base price using a 60/40 blend of the Graham Number and analyst consensus targets — Overlays the Mars Index (Musk Effect) to factor in AI adoption, giving a separate AI-adjusted fair value — Scores every company's AI readiness from 0–100 and assigns a tier: AI Pioneer, AI Adopter, Laggard, or Neutral — Displays a 2-year price history chart comparing actual price vs. Buffett and Mars fair value lines — Shows full key metrics: P/E, P/B, Return on Equity, Debt/Equity, Market Cap, and sector THE BMI QUADRANT CHART Visualize the entire S&P 500 on one scatter plot. The X-axis shows Buffett Upside, the Y-axis shows Mars Upside, and bubble size reflects Market Cap — so you instantly see which stocks offer value on both dimensions, and which are riding AI hype alone. TWO MODELS, ONE DECISION The Buffett Buy Model anchors valuation in fundamentals: Graham Number, DCF value, owner earnings, and book value. The Mars Index adds an AI premium or discount on top, rewarding true AI pioneers and penalizing laggards. Compare both side by side for every stock. WATCHLIST & S&P 500 SCREENER Save your favorite tickers to a personal Watchlist and screen the full S&P 500 with filters for value category, AI tier, and sort by Buffett upside, Mars upside, ticker, or price. BMI is built for investors who want to think — not just trade.
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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
Supabase
react-native-chart-kit
expo-router
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.
