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
uCard - Wallet
Save and organize your cards in one place without ads and other “promotional offers”
$0.99 · In-app purchases
PRICE
$0.99
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 included18 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 uCard - Wallet: map the core Shopping 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
Add support for various card types and advanced management features.
Assumption to check: Limited card support and management features
Validate with people who use this workflow before building.
Hypothesis 2
Focus on user feedback to improve the app experience and functionality.
Assumption to check: Poor user reviews and ratings
Validate with people who use this workflow before building.
Hypothesis 3
Implement advanced security features like biometric authentication and data encryption.
Assumption to check: Security and privacy concerns
Validate with people who use this workflow before building.
Hypothesis 4
Simplify transaction tracking with clear categorization and easy filtering.
Assumption to check: Complexity in tracking transactions
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
Save and organize your cards in one place without ads and other “promotional offers”. Simple and convenient, without anything superfluous. STORES CATALOG AND YOUR OWN CARDS A large number of stores that you can choose simply from our catalog without adding map photos. Or add a card with your own design and name. DESIGN AND CONVENIENCE Convenient and understandable design of full-size maps in the application SYNCHRONIZATION BETWEEN DEVICES Synchronizing accounts using authorization. Create a profile to sync cards in one click. CARDS IN WALLET Add any card from uCard to Wallet with just one click of a button, and scan the card in the store. Adaptive Card for Wallet will also be available on your Apple Watch. SAVE YOUR CARDS IN ONE PLACE Add all your cards in a few seconds by simply scanning the code from your card.
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
Axios
React Navigation
Shadcn/ui
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.
