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
Seller, a Facebook app
Seller is a dedicated app to manage and grow your Facebook Marketplace business, all in one place.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
7,915 ratings · Top 5%
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 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 Seller, a Facebook app: map the core Business 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
Allow users to customize display options for their products.
Assumption to check: Limited customization for product listings
Validate with people who use this workflow before building.
Hypothesis 2
Simplify product management with a better UI and intuitive workflows.
Assumption to check: Difficult product management interface
Validate with people who use this workflow before building.
Hypothesis 3
Integrate analytics to track sales performance and customer engagement.
Assumption to check: Lack of analytics features
Validate with people who use this workflow before building.
Hypothesis 4
Add chat or messaging features for better customer interaction.
Assumption to check: Inadequate customer communication tools
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
Seller is a dedicated app to manage and grow your Facebook Marketplace business, all in one place. See what needs your attention. Seller home surfaces what matters first: items to ship, buyers to respond to, and listings to reprice. Create listings fast. Upload photos and Meta AI fills in the details: title, description, price suggestion, and category so you can publish fast. Bulk listing lets you create multiple listings at once. Your buyer messages, all in one place. Buyer conversations live here that are threaded by item, so you can see every conversation tied to a specific listing. Manage your inventory. View, edit, relist, and manage your full inventory from a single place. Track what's working. See which listings are getting views, clicks, message threads, and sold listings to price competitively and make smarter decisions about your inventory. Connected to Facebook Marketplace. Sign in with your Facebook account and your listings, messages, ratings, and selling history carry over. Listings you create or edit in the Seller app automatically appear on Facebook Marketplace for buyers to find and purchase. Everything stays in sync.
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
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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.
