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.
MortQ is a mortgage payment calculator designed by a real estate professional to quickly calculate the metrics used by lenders and cooperative apartment boards to qualify real estate purchasers
$1.99 · 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.
First kit free with a verified email
Combine features and design from your favorite apps.
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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 MortQ Mortgage Qualifier: 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 financial education resources
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No customization options for calculations
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Single-use fee may deter users
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of integration with financial institutions
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.
MortQ is a mortgage payment calculator designed by a real estate professional to quickly calculate the metrics used by lenders and cooperative apartment boards to qualify real estate purchasers. MortQ provides access to a table of current mortgage rates that can be selected, or users can enter their own rates. In addition to mortgage rate, term and principal amount, users can also enter other relevant monthly expense data and annual income data to calculate a monthly debt to income ratio (DTI) - a key factor in determining one's ability to borrow for and purchase a home. There are no advertisements in MortQ and no data is uploaded from your phone. All data entered is stored locally on your mobile device so that specific values can be changed for different property prices, mortgage rates, etc. A complete analysis detailing input data, after-purchase liquidity amounts, and estimated after-tax monthly payments can be emailed to save a text version of the app’s output. Each analysis can be stored as a separate MortQ data file to provide quick access to various property, income or rate scenarios.
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.