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
Where real people propel your curiosity
Free · In-app purchases
OVERALL US RANK
#18
Grossing · all categories
REVENUE (Est)
$1.3M/mo
$757K - $1.8M
RATING
★ 4.5
29,038,262 ratings · Top 15%
Evidence scope: #18 is the current overall US Grossing 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 Facebook: map the core Social Networking 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
Where real people propel your curiosity. Whether you’re thrifting gear, showing reels to that group who gets it, or sharing laughs over fun images reimagined by AI, Facebook helps you make things happen like no other social network. Explore and expand your interests: * Shop Marketplace for hidden gems and take your hobbies to the next level * Personalize your Feed to see more of what you like, less of what you don’t * Ask Meta AI for information and get answers instantly * Drive into reels that reflect the things you're interested in * Search Facebook on any topic and get more interactive results Connect with people and communities: * Join groups to learn tips from real people who’ve been there, done that * Get inspired by creators, or catch up with Friends * Add new Friends to your world, but also decide how closely to keep up with them * Privately message relatable posts that only your BFF will get or that reels trend everyone’s talking about Share your world: * Use generative AI to create custom stickers and images to delight friends * Customize your profile to choose how you show up and who sees your posts * Effortlessly create reels from trending templates, or showcase your creativity with a full suite of editing tools * Capture moments on the fly with stories Some features may not be available in your country or region. Terms & Policies: https://www.facebook.com/policies_center Privacy Policy: https://www.facebook.com/privacy Learn how we're working to help keep our communities safe across Meta technologies at the Meta Safety Center: https://about.meta.com/actions/safety
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 stronger privacy controls and transparent data policies.
Assumption to check: Privacy concerns regarding user data and security
Validate with people who use this workflow before building.
Hypothesis 2
Enhance content curation and personalized feeds.
Assumption to check: Overwhelming amount of content can lead to user fatigue
Validate with people who use this workflow before building.
Hypothesis 3
Simplify navigation with clearer labels and fewer tabs.
Assumption to check: Complex navigation can confuse users
Validate with people who use this workflow before building.
Hypothesis 4
Introduce stricter moderation and filtering options.
Assumption to check: Spam and unwanted interactions in notifications
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
WebSocket
react-native-reanimated
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.
