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
Clipper Card
The Clipper app is here!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 3.8
11,637 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/
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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 Clipper Card: map the core Travel 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 more robust error handling and loading states.
Assumption to check: Users report issues with app crashes during payment processing.
Validate with people who use this workflow before building.
Hypothesis 2
Add support for more payment methods like PayPal or Apple Pay.
Assumption to check: Limited payment options frustrate users.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance filtering and sorting options for better user experience.
Assumption to check: Transaction history can be confusing to navigate.
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 Clipper app is here! - Pay your fares with Clipper in Apple Pay - Manage your account(s) - Load cash value and transit passes - Plan your trips Clipper is the all-in-one transit card used for contactless fare payments throughout the San Francisco Bay Area. The new Clipper app lets you manage your Clipper account from your iPhone—add value, view your history, and plan your trip! Download the Clipper app today! Pay with Your iPhone or Apple Watch The Clipper app gives you step-by-step instructions for setting up a new Clipper card or transferring an existing Clipper card to your Apple Wallet. Manage Your Account The Clipper app gives you the same account access as the website, but on your iPhone! You can register a new card, load cash value and transit passes, set up Autoload, view your recent activity, and other features. Sign in and out of multiple Clipper accounts in the Clipper app to manage a card on behalf of someone else. Plan Your Trip The Clipper app has real-time transit information and helpful trip planning tools to make getting around the Bay easy! You can view nearby transit options and routes, get real-time travel and arrival information, and save your favorite locations, stops, and stations. By downloading this app, you agree to and accept the terms of the Clipper Mobile Application License Agreement (https://www.clippercard.com/ClipperWeb/mobile-application-agreement.html) and the Clipper Privacy Policy (https://www.clippercard.com/ClipperWeb/privacy.html). Clipper serves 24 transit services in the San Francisco Bay Area: AC Transit BART Caltrain City Coach County Connection Dumbarton Express FAST Golden Gate Ferry Golden Gate Transit Marin Transit Muni Petaluma Transit SamTrans San Francisco Bay Ferry Santa Rosa CityBus SMART SolTrans Sonoma County Transit Tri Delta Transit Union City Transit Vine VTA WestCAT Wheels By downloading this app, you agree to and accept the terms of the Clipper Mobile Application License Agreement (https://www.clippercard.com/ClipperWeb/mobile-application-agreement.html) and the Clipper Privacy Policy (https://www.clippercard.com/ClipperWeb/privacy.html).
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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
Axios
React Navigation
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.
