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
JavaScript Blocker for Safari
JavaScript Blocker for Safari is a Safari extension that gives you simple, powerful control over website scripts
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
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 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 JavaScript Blocker for Safari: map the core Developer Tools 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 user testimonials and a review system.
Assumption to check: Lack of user reviews and trust signals
Validate with people who use this workflow before building.
Hypothesis 2
Add features for granular control over JavaScript blocking.
Assumption to check: Limited functionality for advanced users
Validate with people who use this workflow before building.
Hypothesis 3
Enhance UI with better categorization and grouping of websites.
Assumption to check: Potential confusion in managing multiple websites
Validate with people who use this workflow before building.
Hypothesis 4
Create a simple onboarding tutorial for new users.
Assumption to check: No clear onboarding process
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
JavaScript Blocker for Safari is a Safari extension that gives you simple, powerful control over website scripts. Block JavaScript on the current page, across an entire domain, or on all websites to browse with more control, fewer distractions, and added privacy. You can also whitelist trusted sites so they stay allowed when blocking is enabled globally. · Block JavaScript on Current Page: Disables JavaScript on the exact page you are visiting. · Block JavaScript on Domain: Turns off JavaScript across the current website domain. · Block JavaScript on All Websites: Apply JavaScript blocking across all sites at once. · Whitelist Trusted Domains: Keep selected domains allowed when blocking all websites is enabled. · Block Inline Scripts Too: Prevents inline JavaScript and event-based scripts from running. · One-Tap Toggle Control: Enable or disable blocking instantly from the extension popup. · Privacy-first design: No data collection, tracking, or logging, your browsing stays completely private. · Multilingual support: Use the extension in multiple languages for a globally friendly experience. · Clean, user-friendly UI: Enjoy a streamlined design that integrates smoothly into your workflow. · Seamless Safari integration: Built to work flawlessly across Safari on macOS, iOS, and iPadOS.
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
Zustand
Axios
React Navigation
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.
