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
Leasematic - Auto/Car Lease & Loan Calculator
Leasematic delivers an intuitive, full featured, accurate and aesthetic app capable of simple to complex auto lease and loan calculations
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.3
180 ratings · Top 30%
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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Add to a Remix
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
Generating… usually about a minute.
Make it yours Optional
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included16 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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.
JavaScript is required to complete mailbox verification.
Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Leasematic - Auto/Car Lease & Loan Calculator: map the core Finance workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
JavaScript is required to complete mailbox verification. Return to this prompt preview.
Continue in Rork >
Affiliate link: CloneChart may earn a commission at no extra cost
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.
Hypothesis 1
Include more financial scenarios like leasing vs buying.
Assumption to check: Limited features for advanced calculations
Validate with people who use this workflow before building.
Hypothesis 2
Simplify subscriptions and provide clear value propositions.
Assumption to check: In-app purchase complexity
Validate with people who use this workflow before building.
Hypothesis 3
Implement modern UI/UX design principles for better navigation.
Assumption to check: User interface may feel outdated
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to save their history in the cloud for access across devices.
Assumption to check: No cloud backup for calculations
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
Leasematic delivers an intuitive, full featured, accurate and aesthetic app capable of simple to complex auto lease and loan calculations. Save, edit, copy, delete, compare, share and switch between your deals on the fly. Produce informative breakdown/summary screen detailing how cap cost, monthly payment and all other key figures were calculated – then email or AirDrop the output to your dealer or client! Need help? Contact us at [email protected] Key Feature: - Calculate lease and loan payment on your iPhone/iPod Touch using an intuitive and polished interface - View summary of calculations like a dealer/broker worksheet!!! A must have for negotiations and understanding the lease/loan structure!!! - Save all your deals and easily browse them. Great for buyer shopping around or a dealer/broker handling multiple deals on your iPhone - Share (export/import) your saved deals by emailing or via AirDrop to your dealer, client or friend - Compare your saved deals against each other - Use step by step wizard to guide you through the process! - Handle Sales Tax scenarios for all States including the complex States that don't simply tax monthly payments! Just select your state and Leasematic knows the applicable sales tax alternatives. Including all the complex scenarios of capitalizing sales tax using mathematically correct formulas. You can even edit sales tax calculation rules for any state right from the App. - Email/AirDrop screenshots of Summary and Compare screens right from the App Leasematic calculations have been tested and verified against professional lease software used by dealers. Visit facebook.com/leasematic for more screenshots, demo video and updates! ** Any issues or suggestions? Reach us at [email protected]
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
< Scroll to see more >
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
React Native
Expo
TypeScript
Redux
Axios
React Navigation
BUILD KIT DIFFICULTY
Starter
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.
