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.
If you want a simple but comprehensive car loan or lease calculator, this app will be the one.
$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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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 Car Loan Budget 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 compared to other finance apps
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Poor user reviews regarding bugs
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Subscription model may deter users
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.
If you want a simple but comprehensive car loan or lease calculator, this app will be the one. Leave the complicated calculation to us, only you need to do is input the necessary value and rates, then just check the result, you will get the info you want. You can save the results for later reference and comparison. It has four calculators: Loan Calculator: Input the car price, down payment, trade-in value, sales tax, interest rate, term and start date, you will get total interest, total sales tax, payoff date, total borrowed, total payment, loan cost and payment of each cycle. Lease Calculator: Input the MSRP, negotiated price, down payment, residual value, trade-in value, sales tax, interest rate and term to get pretax payment and total payment each cycle, total all payment and total lease cost. Affordability Calculator: Input affordable payment, down payment, trade-in value, owned on trade-in value, sales tax, interest rate, term and start date to get the value you can borrow, total interest, payoff date, affordable car price, total of all payment and total loan cost. Lease or Loan Calculator: Input the car value, down payment, residual value, trade-in value, sales tax, interest rate, loan term and lease term, and then you can get the comparison sheet with payment of each cycle, number of payment, total sales tax, total of all payment and total cost. Other features: ⁃ Take cash rebate, other fees and owed on trade-in value into calculation. ⁃ Frequency could be weekly, bi-weekly, monthly, quarterly and yearly. ⁃ The payment of each cycle including payment time, principal, interest and balance will be listed. ⁃ Add Extra payment. ⁃ Get the analysis if adding extra payment. ⁃ Share the schedule with others by email. ⁃ Save the loan and lease results. ⁃ Compare several loans or leases in one sheet. ⁃ Manage and track loans. ⁃ Create notification for each payment. ⁃ Passcode protection. ⁃ Set your own currency. ⁃ Backup and restore by iCloud or Dropbox. ⁃ Supports universal version. If you have any question or suggestion, please send email 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.