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
Contact-Cards
Forget paper business cards, because they are unnecessary and severely outdated!
$1.99 · In-app purchases
PRICE
$1.99
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 included16 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 Contact-Cards: map the core Business 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
Allow users to customize card layouts and themes.
Assumption to check: Limited customization options for contact cards
Validate with people who use this workflow before building.
Hypothesis 2
Implement QR code sharing or link sharing for easy access.
Assumption to check: Difficult to share cards with non-users
Validate with people who use this workflow before building.
Hypothesis 3
Provide insights on how often cards are viewed or shared.
Assumption to check: No analytics on card interactions
Validate with people who use this workflow before building.
Hypothesis 4
Offer cloud storage options for managing more cards.
Assumption to check: Limited storage for cards
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
Forget paper business cards, because they are unnecessary and severely outdated! Take your business presence to the next level with this innovative and unique app. The following features are at your disposal: - Store and manage business cards of you or your company. - With the QR code your business partner can easily and quickly save your business cards in his contacts - even without having this app installed! All they have to do is open up the camera app on their smartphone and scan your QR code. - Share your cards even faster directly from your homescreen with WIDGETS, which also display a QR code for scanning. There are 2 sizes of the widgets (QR code only or QR code with contact details). You can display as many of your business cards as you want on your homescreen as a widget. To choose which card to display in the widget, long-tap on the widget and select "Edit widget”. - Tap the share button of the card to share the contact via email, SMS/iMessage, Whatsapp, Signal or other apps/messengers. - Minimalist design with support for darkmode. - Innovative, simple and self-explanatory operation. We value your privacy. Your data belongs only to you, that's why the app stores your valuable data safely in your iCloud. At no time we have access to it, which is why this app is also very suitable for companies. Also, the app does not have access to your contacts on your smartphone.
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
Zustand
react-navigation
expo-image-picker
@react-native-vector-icons
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.
