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
Sell in May
# Professional Market Intelligence
$4.99 · In-app purchases
PRICE
$4.99
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 Sell in May: 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
Incorporate social sharing and community insights.
Assumption to check: Lack of user engagement and community features
Validate with people who use this workflow before building.
Hypothesis 2
Implement detailed analytics and historical data comparison.
Assumption to check: Difficulty in tracking performance over time
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to customize dashboards and alerts.
Assumption to check: Limited customization options for user preferences
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
# Professional Market Intelligence. Completely Private. Sell in May brings institutional-grade market analysis to your iPhone—with zero cloud dependency. Combining advanced pattern recognition with optional LSTM deep learning, it reveals what history suggests about any stock's future under similar market conditions. **Regime-Aware Analysis** Unlike basic charting apps, Sell in May understands that markets behave differently during bull runs versus bear markets. It automatically classifies current conditions (volatility, trend, sentiment) and surfaces only relevant historical patterns—giving you context-aware intelligence, not just raw data. **Dual-Engine Approach** • Pattern matching across 10+ years of similar market regimes • Optional AI forecasting with probabilistic multi-day predictions • Two complementary methods reduce bias and increase confidence **100% On-Device Processing** Your data never leaves your phone. No account, no cloud backend, no tracking. Just professional-grade tools with complete data sovereignty. Works offline after initial data fetch. **Professional Features** • Multi-horizon forecasting with confidence intervals • 14+ technical indicators and risk metrics • Optional macro-economic context (FRED integration) • Real-time regime detection and scenario analysis Perfect for active traders, swing traders, and privacy-conscious investors who refuse to compromise on analytical power. No subscriptions. No surveillance. No compromise. *Disclaimer: Educational tool only. Past performance doesn't guarantee future results. Not investment advice.*
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
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Axios
react-native-chart-kit
BUILD KIT DIFFICULTY
Advanced
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.
