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.
How much will that house really cost per month or every two weeks? Want to know BEFORE you buy it and sign your life away?
$6.99 · 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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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 Mortgage Loan Calculator Pro: 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 functionality for complex calculations
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No user account features for saving history
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of customization options for user preferences
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Poor visual design and user experience
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.
How much will that house really cost per month or every two weeks? Want to know BEFORE you buy it and sign your life away? Then use my Mortgage Home Loan Payment Calculator and find out in just a few minutes. NEW FEATURE Added on 10/9/2019: Users can now save multiple mortgage home loan scenarios. You can save 5 different scenarios per calculation screen for a total of 15 scenarios. The Mortgage Home Loan Payment Calculator Pro turns you into a negotiator extraordinaire and a well-informed future home-owner when shopping for a house by quickly and easily calculating a monthly loan payment or an affordable purchase price on location with your mobile device. NO ADS on this version. This app has no ads and fully supports tablets and phone screens of all sizes. SAFE - We DO NOT collect any personal information with this app. It only requests the minimum permissions necessary to perform its functions. You can also export the mortgage loan data and then send it on a Text message or an Email message. Just press the Export Data button and the app will ask if you want to send it via email or text message. You then press the email or text button and app will paste all of the data into the body of the message. The app will also show you the payment schedule for your proposed mortgage. Just enter all of your data, press the Calculate button, and then press the Show Payment Schedule button and it will show you the principal, interest, and principal loan balance for each month of your mortgage. This app can be moved to the SD card. At the start screen, you simply choose what you want to calculate: 1. Monthly and BiWeekly Loan Payment. 2. The Price of a House that you can Buy based on the Monthly Payment that you can Afford. You then simply enter the required information (e.g., price, interest rate, term of loan), plus any optional information (e.g., Property Tax, Insurance, PMI, HOA dues, etc.), and then press the calculate button. Two main options are available to the user from the start screen: Calculate a Monthly and BiWeekly Loan Payment. This option offers allows the user to input all items that a dealer finance manager would input into their system to calculate a monthly loan payment. A user can enter the following: 1. Property Info (optional) 2. Price of House (required) 3. Closing Costs financed (optional) 4. Down Payment (optional) 5. Interest Rate (required) 6. Term of Loan in years (required) 7. Annual Insurance (optional) 8. Annual Property Tax (optional) 9. HOA dues/fees monthly (optional) 10. PMI (monthly) 11. Misc Annual Expenses (optional) 12. Extra Payment Annual (optional) The app then calculates the monthly and biweekly loan payment of the car based on the information above. It will also display the total amount financed, the total interest, and the total of payments. If you enter an extra annual payment (to pay down the principal balance), the app will also determine if and when the load will be paid off early. Calculate the Affordable Purchase Price of a car based on the monthly loan payment interest rate, term of loan and any other optional information. A user can enter the following: 1. Property Info (optional) 2. Monthly Payment (required) 3. Closing Costs financed (optional) 4. Down Payment (optional) 5. Interest Rate (required) 6. Term of Loan in years (required) 7. Annual Insurance (optional) 8. Annual Property Tax (optional) 9. HOA dues/fees monthly (optional) 10. PMI (monthly) 11. Misc Annual Expenses (optional) The app then calculates the affordable purchase price of the car based on the information above. It will also display the total amount financed, the total interest, and the total of payments. Please feel free to email any questions, comments, or suggestions to [email protected]
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.