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.
CardStack helps you save $500+ every year on the credit cards you already carry
Free · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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.
JavaScript is required to complete mailbox verification.
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Credit Card Tracker: CardStack: map the core Finance workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
JavaScript is required to complete mailbox verification. Return to this prompt preview.
Affiliate link: CloneChart may earn a commission at no extra cost
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
Assumption to check: Difficulty in tracking multiple card rewards effectively
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited customization options for rewards tracking
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: In-app purchases may not be clear or tempting
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
CardStack helps you save $500+ every year on the credit cards you already carry. Maximize cashback and offers, never miss a statement credit, redeem your points at peak value, and let our AI agent do the heavy lifting — so your cards always pay you back more than they cost. Stop leaving money on the table. Start with CardStack. FEATURES: - SAVE MORE WITH CARD-LINKED OFFERS Automatically add Amex and Chase offers to your cards so you earn cashback and statement credits on purchases you're already making. Browse active offers, see personalized picks matched to your spending, and track every redemption — all in one place. - NEVER MISS A STATEMENT CREDIT Track every credit across all your cards automatically — dining, travel, streaming, airline, and more. See which credits are available, which are expiring soon, and which you've already used. Get reminders before you lose them. - USE THE RIGHT CARD, EVERY TIME Instantly see which card earns the most for dining, travel, groceries, gas, and every other category. Whether you're booking a flight or grabbing coffee, CardStack tells you the best card to pull out — so you never miss points or cashback. - STACK AI AGENT — YOUR PERSONAL CARD ADVISOR Meet Stack, a conversational AI agent that knows your entire card portfolio. Ask it anything: "What's the best card for this hotel booking?" "Am I missing any credits this month?" "Compare my Sapphire Reserve vs. Platinum for a trip to Tokyo" "How much value am I leaving on the table?" Stack doesn't just answer — it takes action. It can mark credits as redeemed, set reminders, update your points balances, and generate weekly spending reports showing exactly where you earned and where you missed. - SEE HOW MUCH YOU'RE EARNING (AND MISSING) Connect your bank securely with Plaid and unlock full spending analysis: See points earned vs. points missed on every transaction Get your optimization score — what percentage of spend hit the best card View breakdowns by category: flights, hotels, restaurants, groceries, and more Get "Fix My Stack" recommendations showing exactly which card to swap in - TRACK YOUR POINTS PORTFOLIO Monitor balances across Amex Membership Rewards, Chase Ultimate Rewards, Capital One Miles, Citi ThankYou, and more. See estimated cash values, explore transfer partners, and know exactly what your points are worth. - COVER YOUR ANNUAL FEES — OR CANCEL WITH CONFIDENCE CardStack's Renewal Advisor calculates whether each card pays for itself based on your real usage. When your annual fee posts, get a clear verdict: keep, downgrade, or cancel — backed by data, not guesswork. - SMART NOTIFICATIONS THAT SAVE YOU MONEY Credits expiring soon Annual fee renewal approaching Offers about to expire Missed optimization opportunities AI-generated insights based on your spending - CARDSTACK+ UNLOCKS THE FULL SYSTEM Upgrade to unlock powerful automation and intelligence: Stack AI Agent with full conversation history Secure bank sync with Plaid for automatic transaction analysis Auto-detect statement credits from your transactions Earned vs. missed rewards analysis across every purchase Safari extension that shows the best card while you shop Automatically add Amex & Chase offers Weekly AI spending reports and optimization scores Personalized "Fix My Stack" recommendations Sync across all your devices YOUR CARDS ARE COSTING YOU — OR PAYING YOU. KNOW WHICH. CardStack turns your credit cards into a money-saving system. Every credit tracked. Every offer captured. Every purchase optimized. Download CardStack and start saving. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Written user reviews are not shown here. Check current App Store reviews >
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.