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
EZ Financial Calculators Pro
For phone and tablet, this application includes the complete package of financial calculators by Bishinew Inc:
$6.99 · In-app purchases
PRICE
$6.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
24 ratings · Top 15%
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.
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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.
What's included18 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.
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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 EZ Financial Calculators 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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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
Expand calculator offerings to include more financial scenarios.
Assumption to check: Limited variety of calculators compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement a guided onboarding process.
Assumption to check: Can be confusing to navigate for new users
Validate with people who use this workflow before building.
Hypothesis 3
Add options to share results on social media.
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Clarify purchase benefits and add a free trial.
Assumption to check: In-app purchase options can be unclear
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
For phone and tablet, this application includes the complete package of financial calculators by Bishinew Inc: Finance and Investment Calculators * TVM Calculator * Currency Converter * Compound Interest Calculator * Return On Investment (ROI) Calculator * IRR NPV Calculator * MIRR Calculator * Bond Calculator * Tax Equivalent Yield Calculator * Rule of 72 Calculator Loan/Mortgage Calculators * Loan Calculator * Loan Comparison Calculator * Loan Refinance Calculator * APR Calculator * APR Advanced Calculator * Commercial Loan Calculator * Simple Loan Calculator * Loan Analysis Calculator * Home Affordability Calculator * Rent vs Buy Calculator * Mortgage Tax Saving Calculator * Discount Points Calculator * Adjustable Rate Calculator * Fixed vs Adjustable Rate Calculator * Bi-weekly Payment Calculator * Interest Only Calculator Retirement Calculators * Retirement Planner * 401k Contribution Calculator * Retirement Calculator * Retirement Savings Analysis * Retirement Income Analysis * Traditional IRA vs Roth IRA * Required Minimum Distribution * Social Security Estimator * Asset Allocation Calculator * 401k Save the Max Calculator * College Savings Calculator * Annuity Calculator Stock Calculators * Stock Return Calculator * Stock Constant Growth Calculator * Stock Non-constant Growth Calculator * CAPM Calculator * Expected Return Calculator * Holding Period Return Calculator * Weighted Average Cost of Capital Calculator * Pivot Point Calculator * Fibonacci Calculator * Black-Scholes Option Calculator Credit Card Calculators * Credit Card Payoff Calculator * Credit Card Minimum Calculator Auto Loan and Lease Calculators * Auto Loan Calculator * Auto Lease Calculator Miscellaneous Calculators * Regular Calculator * Tip Calculator * Discount and Tax Calculator * Percentage Calculator * Date Calculator * Unit Conversion * US Inflation Calculator * Margin and Markup Calculator * Fuel Calculator * Salary Increase Calculator * US Paycheck Tax Calculator * Net Distribution Calculator * Effective Rate Calculator * Mutual Fund Fee Calculator * Unit Price Compare Calculator * Depreciation Calculator * Break Even Point Calculator * Investment Income Calculator * US Health Savings Account Calculator * Certificate of Deposit (CD) Calculator * Recurring Deposit (RD) Calculator * Financial Ratios User can send the calculation results to others via Email. Financial Professionals can email the quote to their clients. The app allows you to edit and prioritize the list of calculators for easy access. Only Currency Converter needs internet access to retrieve the latest currency exchange rate. The app works without internet connection. If you have any question or report issue, please send email to [email protected]. We will reply right away.
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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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
react-navigation
zustand
axios
formik
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.
