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
Koupon: Promo Codes & Deals
Koupon is a free coupon and deals app that finds verified promo codes, discounts, and price drops across Amazon, Walmart, eBay, Best Buy, Macy's and Woot, and tests every code before you see it.
Free · In-app purchases
OVERALL US RANK
#74
Free · all categories
REVENUE (Est)
$131K/mo
$73K - $190K
RATING
★ 4.9
50,647 ratings · Top 5%
Evidence scope: #74 is the current overall US Free chart position. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included17 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 Koupon: Promo Codes & Deals: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Koupon is a free coupon and deals app that finds verified promo codes, discounts, and price drops across Amazon, Walmart, eBay, Best Buy, Macy's and Woot, and tests every code before you see it. If you're seeking daily deals, promo codes, or coupons for the brands and stores you already shop, Koupon brings them into one place and checks them so you don't have to. HOW WE VERIFY EVERY CODE Most coupon apps list codes nobody has tested. Koupon checks each one twice. Our system tests the code automatically, confirming it works, what discount it gives, and which products it applies to. Our editors then review what the system found and catch what automation can't: misleading terms, regional limits, and deals that are technically valid but not worth your time. A code only goes live when both agree. Verification doesn't stop at publishing. Every live deal is monitored, re-checked on a regular schedule, and flagged or removed when it stops working. Our systems process over 10 million verification checks every day. Each deal shows when it was last verified, so you always know how fresh it is. Spot a code that failed? Tap Report on any deal page and it goes straight into our verification queue. DAILY DEALS, DISCOUNTS & PRICE DROPS New deals land every day. Seek deals by discount percentage, price drop, or category, and check the discount history and deal quality before you buy. Set alerts for all-time lows, flash sales, and trending products so the best prices reach you first. COUPONS FOR YOUR FAVORITE BRANDS Browse verified coupons and deals for over 3000 brands, including Apple, Samsung, Nike, Dyson, LEGO, Sony, KitchenAid, and Stanley. Follow the brands you love and never miss a markdown. SHOP BY CATEGORY Find savings across every category you shop: - Electronics: laptops, TVs, headphones, smart home - Fashion: clothing, shoes, bags, jewelry - Home & Kitchen: appliances, furniture, bedding, cookware - Beauty & Health: skincare, makeup, vitamins, personal care - Baby, Pet, Toys, Sports & Outdoors, Grocery, Automotive, and more BLACK FRIDAY, PRIME DAY & SEASONAL SALES When the big sales hit, Koupon tracks them live: Black Friday, Cyber Monday, Amazon Prime Day, Back to School, and the holiday season. Get the verified codes and lowest prices as they drop, not the day after. AMAZON, WALMART, EBAY & MORE One search covers Amazon, Walmart, eBay, Best Buy, and Woot. Compare deals across stores without opening five apps. YOUR CHECKOUT STAYS WITH THE RETAILER Apply codes directly at the retailer's checkout. Your purchase and payment happen on the retailer's site, and Koupon never processes your payment. Koupon earns a commission on some purchases, which never changes the price you pay or the deals we show you. Join 20M+ shoppers worldwide who save with Koupon. Rated 4.9 with over 5 Million Downloads. Download Koupon and start saving today!
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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
Implement a robust search feature with filters and categories.
Assumption to check: Users often find it difficult to navigate to desired deals quickly.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to customize their home feed based on interests.
Assumption to check: Limited personalization options for users' preferences.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the subscription process and provide clear benefits for each tier.
Assumption to check: In-app purchase options can be confusing.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce customizable notification settings to enhance user control.
Assumption to check: Notifications may be overwhelming, leading to user disengagement.
Validate with people who use this workflow before building.
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
react-native-reanimated
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.
