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
WealthBuilder: FIRE Calculator
Find the day you can retire — and the paycheck you'll pay yourself when you get there.
$9.99 · In-app purchases
PRICE
$9.99
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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A product spec, screen plans, and build steps for your coding agent.
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What's included
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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
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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.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
Find the day you can retire — and the paycheck you'll pay yourself when you get there. One price, forever. No subscription, no ads, no bank linking. Your numbers stay yours. Monte Carlo plus real S&P history (1928–2025), Roth conversion planning, Solo 401(k) math, and four drawdown strategies — in one plan. WHAT'S INSIDE • Net worth dashboard — assets, debts, and your complete financial picture • Your FI number — how much you actually need for work to become optional • Retirement paycheck — compare four drawdown orders side by side: taxable-first, deferred-first, pro-rata, and bracket-fill • Roth conversion planner — model bracket-fill conversions before year-end • Solo 401(k) engine — sole-prop vs S-corp contribution math plus a contribution ledger, using 2026 IRS limits (Rev. Proc. 2025-32) • Monte Carlo simulation + historical backtest against real S&P returns, 1928–2025 • What-if scenarios — job break, big purchase, lump sum, inheritance, loss of a spouse • Household modeling — spouse, children, and trusts, including survivor-trust planning • Military and railroad retirement modeling — rarely supported anywhere else PRIVATE BY DESIGN Every number in this app is one you typed yourself. There is no bank linking, no account aggregation, no ads, and no tracking. We can't see your accounts — because you never connect them. ONE PRICE, THE WHOLE RELATIONSHIP $9.99 once. No subscription. No in-app purchases. No feature gates. Serious planning tools typically cost $120–$550 every year; this one you buy once and own. WHO IT'S FOR • FIRE-minded savers who want drawdown and safe-withdrawal math, not a demo • Self-employed professionals working out Solo 401(k) contributions before Dec 31 • Near-retirees planning Roth conversions and drawdown order • Military and railroad families whose pensions other calculators ignore WealthBuilder is an educational calculator. It does not provide financial, investment, tax, or legal advice. Consult a qualified professional before making financial decisions. From the maker of Debt Snowball Planner.
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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
BUILD KIT DIFFICULTY
Not assessed in a Build Kit yet.
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.
