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
Spottable: Marketplace Alert
Never miss a deal on Facebook Marketplace again
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 5.0
1 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 included16 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 Spottable: Marketplace Alert: 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
Implement customizable notification settings.
Assumption to check: Users may miss notifications if they are not timely.
Validate with people who use this workflow before building.
Hypothesis 2
Expand product categories and alerts.
Assumption to check: Limited product categories may restrict user options.
Validate with people who use this workflow before building.
Hypothesis 3
Add share functionality for alerts and deals.
Assumption to check: No social sharing features for deals.
Validate with people who use this workflow before building.
Hypothesis 4
Include user reviews and ratings for products.
Assumption to check: Lack of user reviews may affect trust.
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
Never miss a deal on Facebook Marketplace again. Spottable monitors listings 24/7, sends instant alerts, and uses AI to score deals and flag scams — so you can act before anyone else. Try it free — get 3 AI-powered deal analyses per day, no account or subscription required. INSTANT ALERTS, 24/7 Set up saved searches with your keywords, location, and price range. Spottable monitors Facebook Marketplace around the clock and sends you a push notification the moment a matching listing goes live. Add a Boost to any search for near real-time, minute-level alerts. AI DEAL SCORING Not every "deal" is actually a deal. Spottable's AI scores every listing from 0 to 10, compares the price against real market data in your area, and gives you a clear verdict: Good Deal, Fair Price, or Overpriced. See exactly where a listing sits in the market — quartile pricing, dollar and percentage deltas, and comparable sales. SCAM & FRAUD DETECTION AI flags red flags before you waste your time: suspicious pricing, manipulated photos, seller reputation issues, and listing inconsistencies. For luxury items, get AI-generated authentication questions covering serial numbers, material quality, and hardware inspection points. WATCHLIST & PRICE TRACKING Save listings to your watchlist and get notified when prices drop, items sell, or listings appear. Track price history and never lose a listing you're interested in. LENS — SNAP & SEARCH See something in person? Swipe to Lens, point your camera, and snap a photo. AI identifies the item, estimates its market value, and tells you whether the asking price is fair — all in seconds. BUILT FOR RESELLERS, FLIPPERS & BARGAIN HUNTERS Whether you're sourcing inventory to flip, hunting for designer pieces, or just looking for a great deal on furniture — Spottable gives you the speed, intelligence, and confidence to act fast and buy smart. FREE & PREMIUM PLANS - Free: 3 AI analyses per day, no account needed - Starter: 3 searches, 100 AI credits/month, hourly alerts - Pro: 7 searches, 250 AI credits/month, hourly alerts - Max: 20 searches, 500 AI credits/month, hourly alerts + enrichment filters Add Boost subscriptions to get minute-level alerts on individual searches without upgrading your full plan. Purchase additional AI credit packs anytime. This app is a third party service and is not affiliated with, endorsed by, or associated with Meta Platforms, Inc. or Facebook in any way. https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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
Axios
react-navigation
expo-notifications
react-native-async-storage
BUILD KIT DIFFICULTY
Intermediate
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.
