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
Financial Calculator Pro
Take charge of your finances with this powerful Indian Financial Calculator! Whether you need to calculate EMI, Fixed Deposits (FD), Recurring Deposits (RD), SIP, SWP, GST, Profit & Loss, or Share Market Investments, ...
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 included15 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 Financial 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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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 the range of calculators to include more niche financial scenarios.
Assumption to check: Limited calculator options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to save frequently used calculators and customize their interfaces.
Assumption to check: No user customization options
Validate with people who use this workflow before building.
Hypothesis 3
Implement animations and visual cues to enhance user interaction with calculations.
Assumption to check: Lack of visual feedback on calculations
Validate with people who use this workflow before building.
Hypothesis 4
Add functionality to export calculation results to PDF or share via social media.
Assumption to check: No export or share feature for results
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
Take charge of your finances with this powerful Indian Financial Calculator! Whether you need to calculate EMI, Fixed Deposits (FD), Recurring Deposits (RD), SIP, SWP, GST, Profit & Loss, or Share Market Investments, this app has you covered. Designed exclusively for India, it includes the latest banking and post office schemes, tax calculators, and investment tools to help you make informed financial decisions. BANK CALCULATORS: ⁂ EMI Calculator (Loan Calculator / Mortgage Calculator) ⁂ Fixed Deposit Calculator ⁂ Recurring Deposit Calculator (RD) ⁂ PPF Calculator (Public Provident Fund) ⁂ Cash Calculator POST OFFICE: ⁂ Monthly Income Scheme (MIS) ⁂ Time Deposit (TD) ⁂ Recurring Deposit Calculator (RD) ⁂ National Saving Certificate Profit Loss: ⁂ Profit / Loss ⁂ Profit calculator ⁂ Financial Freedom SHARE MARKET CALCULATORS: ⁂ SIP Calculator (Systematic Investment Plan) ⁂ SWP Calculator (Systematic Withdrawal Plan) ⁂ Equity Linked Saving Scheme ⁂ Lumpsum Calculator GENERAL-PURPOSE CALCULATORS: ⁂ Simple Interest Calculator ⁂ Compound Interest Calculator (Future Value Calculator) ⁂ Inflation Calculator PERCENTAGE CALCULATOR ⁂ Advance Discount Calculator ⁂ Pie Chart ⁂ Increase by % ⁂ Decrease by % ⁂ Convert Fraction to Percentage ⁂ Find Percentage ⁂ CGPA to Percentage Calculator ⁂ Marks to Percentage Calculator ⁂ Salary Hike Percentage Calculator ⁂ Percentage Changes ⁂ Margin ⁂ Debt/Mortgage ⁂ a is %b of c ⁂ % of a Part Value ⁂ After % Deducted ⁂ After % Added GST & VAT CALCULATORS: ⁂ Good and Services Tax ⁂ Value Added Tax ⁂ Tip Calculator SALES AND RETAILS ⁂ Discount Calculator ⁂ Sales Calculator ⁂ List Price Calculator ⁂ Sales Tax Calculator ⁂ Reverse Sales Tax Calculator FEATURES: ⁂ Ads FREE ⁂ Works on both Smart Phones and Tablets ⁂ Exclusively for Indians with Indian finance schemes ⁂ Helps you make informed decisions about your finance ⁂ Indian number format ⁂ Displays the Maturity amount ⁂ Displays "Total Amount Deposited" and "Total Interest Earned" ⁂ Displays Yearly and Monthly growth reports ⁂ Displays visually intuitive graphs ⁂ Multiple language support PERMISSIONS: Internet permission is required for Analytics. DISCLAIMER: Important Note: This app is for guidance only. Please verify calculations before making investment decisions. Download now and simplify your financial planning! Your feedback matters—help us improve with your valuable suggestions.
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
Zustand
react-native-reanimated
@react-native-community/async-storage
expo-router
BUILD KIT DIFFICULTY
Intermediate
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.
