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
Card Now - Magic Business
HOW WOULD YOU FEEL …
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.3
3 ratings · Below Average
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 Card Now - Magic Business: map the core Entertainment 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
Provide more templates, colors, and design elements.
Assumption to check: Limited customization options for business cards
Validate with people who use this workflow before building.
Hypothesis 2
Focus on a cleaner, more user-friendly design.
Assumption to check: Poor user interface and experience
Validate with people who use this workflow before building.
Hypothesis 3
Ensure better app stability and performance improvements.
Assumption to check: Inconsistent performance and bugs
Validate with people who use this workflow before building.
Hypothesis 4
Offer clear information on subscription benefits and simplified payment options.
Assumption to check: Subscription model unclear and not user-friendly
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
HOW WOULD YOU FEEL … ... if you could hand out your business card in a way that YOU KNOW people will tell their friends about? Card Now lets you magically produce YOUR BUSINESS CARD on your phone and Then TAKE THE CARD OUT OF YOUR PHONE! ------------ People say ------------ "A seriously cool way to hand out your business card." - Nigel Botterill, author of the best selling UK business book of 2011 "Card Now is a marvellous way to bring your magic to LIFE." - Jay Sankey, world renowned magician ---------------------------------- Features: - Add your card in less than 30 seconds - Start performing within minutes - Be remembered when using one of the three unique revelations Upgrade to PRO and get access to one extra revelation and be able to store as many cards as you want! See the video demo on: CardNowApp.com * Note for iPad users * Card Now is not designed for the iPad. Created by Jakob Halskov and Damian Surr.
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
React Navigation
@react-native-community/slider
Axios
AsyncStorage
BUILD KIT DIFFICULTY
Starter
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.
