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
Finance Calculator Pro
Finance Calculator Pro is an universal iPhone / iPad application giving ordinary users a quick way to estimate credit parameters and evaluate performance of deposits without help of banking professionals
$3.99
PRICE
$3.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.2
34 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.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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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 included
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 Finance 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Finance Calculator Pro is an universal iPhone / iPad application giving ordinary users a quick way to estimate credit parameters and evaluate performance of deposits without help of banking professionals. The program also provides a detailed calculation report in graphical and tabular forms, which can be printed or sent via e-mail for further processing. Check video review and report examples on the developer's web site! Key calculations: - compound interest - saving plan - inflation - installment loan - amortizing loan - balloon loan - target purchase - mortgage loan Key features: - graphical data representation - simulations with gestures on graph - advanced reports (see examples below) - report distribution through e-mail or print - currency configuration (€, $, £, ...) - in-app calculator - save data when exit Other features: - localization: EN/DE/RU - animated user-friendly help - universal app: pay once and use on both iPhone and iPad - comfortable interface If you like this App, take your time and rate it on the AppStore!
Written user reviews are not shown here. Check current App Store reviews >
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
Add more financial calculators and tools.
Assumption to check: Limited functionality for advanced financial calculations
Validate with people who use this workflow before building.
Hypothesis 2
Implement a tutorial or onboarding process.
Assumption to check: Not user-friendly for first-time users
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to save custom settings and templates.
Assumption to check: Lacks customization options for calculations
Validate with people who use this workflow before building.
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 Navigation
React Native Reanimated
TypeScript
BUILD KIT DIFFICULTY
Not assessed in a Build Kit yet.
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.
