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
Checkbook Pro
An easy & quick way to manage your daily finances, Checkbook Pro keeps track of your credit card charges, cash expenditures...etc
$9.99 · In-app purchases
PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.7
989 ratings · Top 50%
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 included17 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 Checkbook 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
Implement automatic transaction categorization and bank linking.
Assumption to check: Manual entry of transactions can be tedious.
Validate with people who use this workflow before building.
Hypothesis 2
Add budget tracking with alerts and progress bars.
Assumption to check: Limited budgeting features.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the UI and enhance navigation.
Assumption to check: User interface can feel cluttered.
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate a feature for detecting and managing recurring expenses.
Assumption to check: No recurring transaction detection.
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
An easy & quick way to manage your daily finances, Checkbook Pro keeps track of your credit card charges, cash expenditures...etc. With Checkbook Pro application, it can totally replace your paper checkbook. You can create multiple accounts, save recurring transactions, transfer funds, view reports & graphs, export data...etc. You can even search the transaction by crossing your finger on the calendar! All details of the Checkbook Pro are well designed to provide excellent experience. FEATURES ※Export in CSV, QIF & HTML Formats -Export your transactions by email for use of desktop applications such as Excel, Quicken...etc. ※Calendar -Show all your monthly transactions as points on the calendar. -Filter transactions by tapping a date or selecting multiple dates on the calendar. ※Recurring Transactions -Save a transaction to be used repeatedly(daily, weekly, 2 weeks, monthly, tire monthly), without retyping all the details. ※Multiple Accounts -Track as many accounts as you need. ※Categories -Supports multiple categories with beautiful icons to choose from. ※Payee & Note -All details you need to keep track of your transactions are including. ※Search -Quickly search for transactions by dates, name, payee and category. -Search and edit transactions in the same screen. ※Transfer -Transfer funds from one account to another. ※Reconcile Transactions -Reconcile your transactions by editing cleared/un-cleared status ※Reports & Charts -Review all your expense & income by category or account with beautiful graphs and reports. -Supports both bar and pie charts. -You can set the time period to daily, weekly, monthly & yearly. ※Passcode -Protects your private information. ※Currency -Supports multiple currencies. ※Elegant, Powerful & User friendly interface If your have any problems or suggestions please send a mail to [email protected], you will get the response in a short time.
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
react-native-paper
Zustand
react-native-reanimated
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.
