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
Curb: Feed Blocker For Safari
Curb is a Safari extension that hides the algorithmic home feeds on the sites you still need — so you can search, subscribe, and message without getting pulled into the scroll.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 1.0
1 ratings · Below Average
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 included15 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 Curb: Feed Blocker For Safari: map the core Productivity 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 advanced algorithms to ensure higher blocking accuracy.
Assumption to check: Users often find feed blocking apps ineffective and unreliable.
Validate with people who use this workflow before building.
Hypothesis 2
Provide features for categorizing and sorting blocked feeds.
Assumption to check: Difficulty in managing and organizing blocked feeds.
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to customize notifications and blocking rules.
Assumption to check: Limited customization options for users.
Validate with people who use this workflow before building.
Hypothesis 4
Clearly explain benefits of premium features and provide a free trial.
Assumption to check: In-app purchase confusion.
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
Curb is a Safari extension that hides the algorithmic home feeds on the sites you still need — so you can search, subscribe, and message without getting pulled into the scroll. WHAT CURB BLOCKS • YouTube — home recommendations feed • Reddit — Home, Popular, and r/all • LinkedIn — home newsfeed • X (Twitter) — For You timeline • Instagram — home feed and a optional toggle to hide the Search/Explore page feed/grid (Search stays on and works normally when feed is hidden) • Facebook — news feed WHAT STAYS WORKING Search, subscriptions, playlists, specific subreddits, messaging, profiles, DMs, and any page you open directly all work normally. Same account, same Safari tab — minus the scroll trap. ZERO FLASH Curb loads blocking rules before the page paints, so the feed never appears — not even for a split second. A SIMPLE GUIDE Where the feed was, Curb can show a short on-page guide pointing you to what still works on that site. Toggle it per site in the Safari toolbar popup. YOU STAY IN CONTROL One switch per site. Turn any platform on or off anytime from Safari’s toolbar — no digging through settings. PRIVATE BY DESIGN No accounts. No servers. No analytics. No tracking. Everything runs on your device. App Store privacy label: Data Not Collected. PAY ONCE — EVERYTHING INCLUDED One purchase unlocks all six platforms. No in-app purchases. No subscriptions. No free trial tricks. IMPORTANT Curb works in Safari on youtube.com, reddit.com, instagram.com, facebook.com, linkedin.com, and x.com — not inside the native YouTube, Instagram, Reddit, or other apps. Apple does not allow extensions to modify other apps. Works on iPhone, iPad, and Mac. Questions, feature requests, bug reporting , facing issue and need help? --> [email protected] | https://curbblocker.com Apple Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.curbblocker.com/privacy App Terms: https://www.curbblocker.com/terms
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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
React Navigation
React Native Async Storage
Expo Notifications
React Native Paper
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.
