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.
REAL ESTATE INVESTOR is the most comprehensive real estate calculator available — packed with 128 financial formulas and interactive
$1.99
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.
First kit free with a verified email
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 Real Estate Investor: 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: Complex, confusing interface
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Slow bank connections
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Security concerns
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.
REAL ESTATE INVESTOR is the most comprehensive real estate calculator available — packed with 128 financial formulas and interactive charts to help you analyze any deal with confidence. Whether you're evaluating a duplex, an apartment complex, or a commercial property, this app gives you instant answers for mortgages, cash flow, appreciation, ROI, flips, refinancing, and more. INTERACTIVE CHARTS & VISUALIZATIONS See your numbers come to life with 17 built-in charts including amortization schedules, appreciation curves, expense breakdowns, cash flow waterfalls, and refinance scenario comparisons — all generated instantly from your inputs. 21 CATEGORIES • 128 FORMULAS MORTGAGE CALCULATIONS — Monthly Payment, PITI, Total Interest, Total Cost, Points, Amortization PROPERTY ANALYSIS — Monthly Cash Flow, NOI, Cap Rate Analysis, Cash on Cash Return, Break-Even Ratio ROI ANALYSIS — Cash on Cash, Total ROI, Return on Equity, Equity Dividend Rate EQUITY & APPRECIATION — Property Value Growth, Equity from Appreciation, Total Equity RENTAL INCOME — Single Family, Multi-Family, Apartment, Commercial, Gross Potential Income, Effective Gross Income DEAL ANALYSIS (FLIPS) — Flip Profit, Profit Margin, Rehab ROI, Maximum Purchase Price BRRRR METHOD — Cash Left in Deal, Refinance LTV, All-In Cost, Post-Refi Cash Flow 1031 EXCHANGE — Boot Calculation, Replacement Value, Deferred Gain, Exchange Equity CLOSING COSTS — Total Cash to Close, Net Proceeds from Sale, Buyer/Seller Costs PROPERTY EXPENSES — Total Operating Expenses, Expense Ratio, Per-Unit & Per-SqFt Costs DEBT RATIOS — DSCR, Debt Ratio, Debt to Equity, Interest Coverage, Asset Utilization CAPITALIZATION — Cap Rate, Property Value, Net Income Multiplier DEPRECIATION — Straight Line, Declining Balance, Double Declining, Value After Years INTEREST FORMULAS — Future Value, Daily Interest, APR, Installment Loan APR INVESTMENTS — Discounted Note Value, Holding Period Return, Rule of 72, Equivalent Taxable Yield RENT MULTIPLIERS — GRM, Market Value VALUATIONS — Price/Income/Expenses Per Unit and Per Square Foot, Adjusted Basis TAX BENEFITS — Depreciation Deduction, Mortgage Interest Deduction, Net Tax Benefit LAND & DEVELOPMENT — Development Profit, Development Margin, Cost Per Unit/SqFt COMMERCIAL REAL ESTATE (Pro) — Triple Net Lease, Tenant Improvements, Lease Analysis ADDITIONAL FEATURES • Multi-currency support with 30+ world currencies • Save and export calculations (Pro) • Reference tables for key ratios, mortgage rates, tax brackets, and depreciation schedules • Clean, intuitive interface optimized for iPhone and iPad
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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.