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
Retire with the S&P 500
Learn how to retire strategically with a portfolio of the S&P 500 stocks.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.0
2 ratings · Below Average
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 Retire with the S&P 500: 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
Integrate AI-driven investment recommendations based on user data.
Assumption to check: Lack of personalized investment advice
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to add a wider range of investments beyond S&P 500.
Assumption to check: Limited investment options
Validate with people who use this workflow before building.
Hypothesis 3
Introduce forums or social features for user interaction.
Assumption to check: No community features for support
Validate with people who use this workflow before building.
Hypothesis 4
Enhance analytics with visual graphs and detailed insights.
Assumption to check: Basic analytics features
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
Learn how to retire strategically with a portfolio of the S&P 500 stocks. This app gives the retired individual who wishes to hold a mix of short term treasury bonds and an ETF which mimics the S&P 500* the ability to assess the size of their final estate based on four factors: ● Value of his starting portfolio ● Percentage held in money market funds ● Yearly expense requirements ● Years of life remaining ● Effective tax rates Vary any or all factors dynamically and determine the financial results and the associated risk. Simulate retiring in prior time periods given your current financial strategy. The app will simulate a retirement based on your inputs and on historical S&P growth rates and inflation rates to estimate a range of possible outcomes. The series of retirement outcomes are generated from 1910 to the present in one year increments. The results are shown in simple and easy to understand graphical and numeric form. *Warren Buffett in his 2013 letter to stockholders recommended just such a portfolio for the average individual because of its low expense ratio and performance superior to most professional money managers.
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
Supabase
React Navigation
TypeScript
Zustand
BUILD KIT DIFFICULTY
Starter
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.
