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
Carousell: Snap-Sell, Chat-Buy
Carousell is the leading community marketplace in Singapore, Hong Kong, Taiwan, Malaysia, the Philippines, and Indonesia
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
10,534 ratings · Top 15%
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 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 Carousell: Snap-Sell, Chat-Buy: 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
Carousell is the leading community marketplace in Singapore, Hong Kong, Taiwan, Malaysia, the Philippines, and Indonesia. Millions of people use Carousell to declutter and sell to earn money, or find great deals and trusted services. From fashion and luxury to furniture, mobile phones, cars, toys and collectibles and home services, find them all on Carousell! LIST IN 30 SECONDS AND SELL FASTER - Take a photo and our AI* fills in the title, description and price. Earn money selling whatever you want. - Start your shop: Use powerful seller tools or upgrade to CarouBiz to run your business on Carousell. - Reach more buyers: Share listings easily on Facebook, Instagram, Telegram and WeChat. - Earn trust: Build your profile with positive reviews from happy buyers. - Sell directly** to Carousell: Clothing, phones, luxury bags, and cars - Integrated delivery: Drop off or schedule doorstep pickup with Carousell Official Delivery (Singapore, Hong Kong, Malaysia only), or use 7-ELEVEN Cash on Delivery in Taiwan. SHOP GREAT DEALS AND BUY SMARTER - Buy what you love: Explore millions of unique, vintage, and limited-edition items across fashion, furniture, electronics, toys, collectibles, luxury, cars, and more. - Best prices, trusted sellers: Compare prices, ratings, and reviews - Safe, simple transactions: Chat, deal, and review — all in one app - Trusted home services: Book air-con servicing, repairs, renovation, cleaning, or movers directly. - Shop Certified^ listings: Buy secondhand phones, bags, watches, and cars with Carousell Certified - Safe checkout: Tap the Buy button to pay securely with escrow-protected Buyer Protection# Carousell brings great value and community together — Sell faster, buy smarter! Give preloved items a second life. Make secondhand your first choice. *AI listing available for non-merchant sellers. Video AI available in Singapore; photo AI available in Singapore, Malaysia, Hong Kong, and Philippines. **Singapore offers: clothing, phones, luxury bags, and cars; Malaysia: clothing, phones, and bags; Hong Kong: clothing ^Certified listings in selected categories in Singapore, Hong Kong & Malaysia. #Buyer Protection available in Singapore, Malaysia, and Hong Kong. Privacy Policy: https://support.carousell.com/hc/en-us/articles/115006700307-Privacy-Policy Terms of Use: https://carousell.zendesk.com/hc/en-us/articles/360023894734
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 a price suggestion feature allowing users to propose offers.
Assumption to check: Difficulties in negotiating prices with sellers
Validate with people who use this workflow before building.
Hypothesis 2
Introduce a verification badge for trusted sellers.
Assumption to check: Limited user verification leading to scams
Validate with people who use this workflow before building.
Hypothesis 3
Add an online status indicator for sellers.
Assumption to check: Inconsistent chat response times
Validate with people who use this workflow before building.
Hypothesis 4
Enhance search with filters for location, price range, and categories.
Assumption to check: Search functionality lacks advanced filters
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.
