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
Darbak Captain
Become a Captain and start earning with every trip! Darbak Captain App is designed for drivers to easily receive bookings from customers and manage their work in one place
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
6 ratings · Top 15%
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 Darbak Captain: map the core Navigation 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 a more reliable traffic data integration.
Assumption to check: Users report issues with real-time traffic updates not being accurate.
Validate with people who use this workflow before building.
Hypothesis 2
Optimize the search algorithm for faster results.
Assumption to check: Some users find the search function to be slow or inefficient.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance offline maps feature for seamless navigation.
Assumption to check: Users wish for better offline map capabilities.
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to categorize or tag saved places for easier access.
Assumption to check: Limited customization options for saved places.
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
Become a Captain and start earning with every trip! Darbak Captain App is designed for drivers to easily receive bookings from customers and manage their work in one place. Get instant notifications for new requests, control your availability with a simple on/off option, and track all your trips from start to finish. Easy Registration – Sign up directly in the app with a simple step-by-step process. Add your personal details, vehicle information, and license – whether you drive a taxi, delivery car, or towing truck. Smart Trip Management – Easily keep track of your new, accepted, and completed trips. Earnings Dashboard – Track your daily, weekly, and total earnings, plus see how many orders you’ve completed. Availability Control – Go online or offline with just one tap. Instant Notifications – Get alerts for new bookings in real time. Download the Darbak Captain App now and take control of your driving business with ease, flexibility, and transparency.
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-maps
@supabase/supabase-js
BUILD KIT DIFFICULTY
Expert
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.
