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
MarkMoneyPro3
MarkMoney is a professional financial calculator that allows you to calculate loans or mortgages or create savings and withdrawal plans in just a few steps
$8.99 · In-app purchases
PRICE
$8.99
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.
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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'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 MarkMoneyPro3: 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
Implement automatic categorization of transactions.
Assumption to check: Users often find it hard to track expenses accurately.
Validate with people who use this workflow before building.
Hypothesis 2
Add a feature for bill reminders.
Assumption to check: Lack of reminders for bills can lead to missed payments.
Validate with people who use this workflow before building.
Hypothesis 3
Incorporate engaging visual charts for budget tracking.
Assumption to check: Visual representation of budgets is often lacking.
Validate with people who use this workflow before building.
Hypothesis 4
Provide educational tooltips and breakdowns for clarity.
Assumption to check: Difficulty in understanding net worth 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
MarkMoney is a professional financial calculator that allows you to calculate loans or mortgages or create savings and withdrawal plans in just a few steps. VERSION 3.0 PRO With the PRO version, you have the option of customizing the layout of the app and the PDF documents yourself. Your logo can be stored in the settings for this purpose. You can also easily make your personal color settings in the settings. In the report settings, you can also design the standard texts for the disclaimer, subject, cover letter, contact details and company data according to your wishes or guidelines. SIMPLE - EFFECTIVE - INTUITIVE As a financial expert, you want to perform your calculations quickly and efficiently without having to deal with cumbersome dialogs and coded abbreviations. The interface is therefore deliberately kept simple and offers all the functions you need for your calculations. MarkMoney provides you with the following financial calculators: - Savings calculator - Withdrawal plan - Loan calculator - Mortgage calculator - Quick car loan calculator - Real estate loan quick calculator - Interest calculator - Inflation calculator Functions of the PRO version: - Customize logo & colors - Customize PDF report - Save and manage projects - Create and share screenshots - Plan A/B comparison - Dark mode support - Available on Mac for iPad Functions of the STANDARD version: - Universal app for iPhone/iPad - Create and share repayment plans - Recording of special repayments, special payments or withdrawals - Dynamic adjustment of savings or withdrawal amount - Inflation rate, tax and allowances taken into account - Installment or interest rate adjustment at any time - Calculator function to support data entry - Graphical simulation via gesture control and slider - Language/currency switching within the app
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
Supabase
Zustand
react-native-reanimated
react-native-svg
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.
