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
Freeby: Free Stuff Marketplace
Freeby is the best app to find free items right in your neighborhood—furniture, clothes, electronics, baby gear, home goods, and more
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.6
176 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's included18 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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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 Freeby: Free Stuff Marketplace: 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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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
Integrate social sharing for listings and user interactions.
Assumption to check: Limited user engagement due to lack of social features
Validate with people who use this workflow before building.
Hypothesis 2
Implement advanced search filters and sorting options.
Assumption to check: Difficulty in finding specific items
Validate with people who use this workflow before building.
Hypothesis 3
Add push notifications for real-time updates.
Assumption to check: No notifications for item claiming or seller responses
Validate with people who use this workflow before building.
Hypothesis 4
Offer better visibility options for free users.
Assumption to check: Limited item visibility for users with no premium features
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
Freeby is the best app to find free items right in your neighborhood—furniture, clothes, electronics, baby gear, home goods, and more. Everything is local, available now, and completely free. Just real people giving away stuff they no longer need. We pull together free listings from your community so you can claim amazing finds before someone else does. Because free stuff saves you money and helps reduce waste. Plus it’s fun! Furnish your apartment for free. Find amazing free local finds. Decorate your home with quality items others are giving away. Freeby makes it simple and fun. Our Features: • All our listed items are free items • Real-time map of free items near you • Instant notifications when free stuff drops • Search for any item you want. • Find the best items to flip • Filter based on the closets items to you • Location-based discovery (find free items within walking distance) Free App Features: • Browse a preview feed of sample listings • See how Freeby works with our quick onboarding tour Full experience with Freeby Paid (Complete Access): • Unlimited access to all live local free listings • Priority alerts for high-value items (like furniture and electronics) • No limits on browsing or claims • Advanced filters (distance, category, newest first) Start finding free stuff today. Your next couch, TV, or baby stroller could be waiting just down the street. Download Freeby now – because free is always better. EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Note: Paid subscription is required to use our app.
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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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
React Navigation
Zustand
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.
