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
CardSale - We buy gift cards
CardSale is a platform which buys gift cards from users for Naira
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.4
982 ratings · Top 30%
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/
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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 CardSale - We buy gift cards: map the core Utilities 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
Streamline form submission with fewer fields and better guidance.
Assumption to check: Users often find the selling process cumbersome.
Validate with people who use this workflow before building.
Hypothesis 2
Integrate multiple payment methods for user convenience.
Assumption to check: Limited payment options for users.
Validate with people who use this workflow before building.
Hypothesis 3
Implement clearer and more helpful error messages throughout the app.
Assumption to check: Inconsistent user experience with error messages.
Validate with people who use this workflow before building.
Hypothesis 4
Provide in-app chat support or a comprehensive help section.
Assumption to check: Lack of customer support options.
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
CardSale is a platform which buys gift cards from users for Naira. After a sale, users can withdraw the income directly into a designated bank account. Why Choose CardSale? 1. Secure Trading: Your security is our priority. CardSale processes transactions swiftly and uses a dependable escrow system to protect every transaction until it's successfully confirmed. 2. Transparent Rates: CardSale buys gift cards from our users at competitive rates. Customers can see how much to get paid upfront. What you see is what you get. Transparent rates with no unexpected charges. 3. Wide Coverage: We purchase popular gift cards on the market. 4. Dedicated Support: Have a question? Our customer support team is available to assist you with your queries. Customers can sell gift cards in 3 Simple Steps: 5. Submit Your Card: Select your gift card brand and enter the necessary details. 6. Wait for Confirmation: Our system will securely verify your card's validity. 7. Get Paid: Once confirmed, you can see your income in the Wallet and withdraw your balance directly to your bank account. Get Started Today! Download now to explore a secure trading option! CardSale is not affiliated with any gift card brands mentioned or shown.
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.
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BUILD KIT DIFFICULTY
Advanced
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.
