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
Whatnot: Shop, Sell, Connect
Whatnot is the largest live shopping platform in the US, UK, and Europe - we’re a marketplace bringing millions together to shop, sell, and connect around the things they love
Free · In-app purchases
OVERALL US RANK
#23
Free · all categories
REVENUE (Est)
$355K/mo
$208K - $502K
RATING
★ 4.7
1,081,150 ratings · Top 15%
Evidence scope: #23 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
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A product spec, screen plans, and build steps for your coding agent.
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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 included18 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 Whatnot: Shop, Sell, Connect: 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
Whatnot is the largest live shopping platform in the US, UK, and Europe - we’re a marketplace bringing millions together to shop, sell, and connect around the things they love. From bags to beauty, comics to coins, sneakers to streetwear, and vintage to vinyl—we’ve got it all. Explore 250+ categories, including electronics, sports and Pokémon cards, fashion, plants, jewelry, and more. FIND INCREDIBLE DEALS ON NAME BRANDS - Join hundreds of thousands of sellers to shop deep discounts from your fashion favorites and everyday essentials. From brands you know and love, to emerging and hard-to-find specialty products. Whatnot has a deal on whatever you’re looking for. SHOPPING HAS NEVER BEEN MORE FUN - Whether you’re getting in on fast-paced auctions, incredible flash sales, live show giveaways, searching through the marketplace, or jumping into the chat—you’ve never had this much fun shopping. Whatnot has brought the best of shopping in-person online. SHOP WITH CONFIDENCE: Purchases are backed by Whatnot's Buyer Protection policy – if your item arrives damaged, missing, or not as described, you're covered. INTERESTED IN SELLING ON WHATNOT? Last year, small businesses generated more than $8 billion in sales on Whatnot. Make more by selling live, join Whatnot today.
Written user reviews are not shown here. Check current App Store reviews >
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 image caching to improve load speeds.
Assumption to check: Users face slow loading times for images
Validate with people who use this workflow before building.
Hypothesis 2
Add more filter options for better search results.
Assumption to check: Difficulties in finding specific items due to lack of advanced search filters
Validate with people who use this workflow before building.
Hypothesis 3
Integrate more payment methods, including Apple Pay.
Assumption to check: Limited payment options can frustrate users
Validate with people who use this workflow before building.
Hypothesis 4
Provide settings to customize notification preferences.
Assumption to check: Notifications can be overwhelming and not targeted
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
Supabase
Zustand
React Navigation
BUILD KIT DIFFICULTY
Expert
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.
