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
CabBook
The Ultimate Taxi Driver Finance Tracker
$4.99 · In-app purchases
PRICE
$4.99
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/
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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 CabBook: 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 using ML to enhance user experience.
Assumption to check: Users often find it challenging to categorize expenses accurately.
Validate with people who use this workflow before building.
Hypothesis 2
Introduce a feature for importing trip data from ride-sharing services.
Assumption to check: Manual entry can be tedious for frequent travelers.
Validate with people who use this workflow before building.
Hypothesis 3
Provide visual reports and insights based on cab expenses.
Assumption to check: Lack of detailed analytics on spending patterns.
Validate with people who use this workflow before building.
Hypothesis 4
Add reminders and notifications for trip logging.
Assumption to check: Users may forget to log trips.
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
The Ultimate Taxi Driver Finance Tracker CabBook is the essential app for taxi drivers who want to take control of their finances. Track every fare, monitor expenses, and see your real profits at a glance. Smart Financial Tracking Record fares with automatic fee calculations Track expenses by category (fuel, repairs, insurance, etc.) View daily, weekly, and monthly summaries See your true profit after all fees and expenses Automatic Fee Calculations Card payment fees (percentage + fixed amounts) Operator app fees Customizable fee settings for your specific needs Instant net income calculations Secure & Private Face ID/Touch ID protection iCloud backup and sync Your financial data stays private and secure Detailed Reports Export data to CSV for tax purposes Visual summaries of income vs expenses Track your earnings over time Perfect for tax season preparation Simple & Fast Quick fare entry with tip suggestions One-tap expense recording Beautiful, intuitive interface Works offline - no internet required
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-navigation
react-native-chart-kit
Zustand
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.
