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.
The most advanced real-time retirement and FIRE (Financial Independence, Retire Early) simulator on the App Store.
$9.99 · 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.
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Combine features and design from your favorite apps.
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Generating… usually about a minute.
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 FIRE and Retirement Calculator: 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 savings inputs
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No reminders for adjusting savings plans
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Complexity in understanding the results
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of community features
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.
The most advanced real-time retirement and FIRE (Financial Independence, Retire Early) simulator on the App Store. * How do different market scenarios affect my plan: a powerful (Monte Carlo) engine that runs a thousand different simulations in real time every time you change any parameter. * How does changing my asset allocation affect my plan: choose the most appropriate asset allocation for you during both the accumulation (before retirement) and withdrawal (during retirement) phases * How do investment fees affect me: Understand the impact of fees on your investments and retirement in the long run * Salary and savings: Find your optimal savings rate and evaluate the impact of salary growth on your retirement * Retirement Spending: Find out how much you can spend in retirement taking into consideration other income sources, inflation and taxes. * Capital Market assumptions: Evaluate the impact of higher / lower asset class returns on the viability of your plan * Chance of success: calculate the odds of success of your plan or have the engine modify your plan to improve your odds * Insight library: a growing library of optimization tools that allow you to answer questions like: + When can I reach Financial Independence? + How much can I safely spend in retirement? + How much should I invest (over time) to reach my target? * Intuitive no-jargon summary: a beautiful report that summarizes your plan in plain words and intuitive charts
Written user reviews are not shown here. Check current App Store reviews >
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.