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
Purify: Block Ads and Tracking
Featured & recommended by CNBC, Wall Street Journal, BuzzFeed, NY Times, Huffington Post, and many more.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.8
728 ratings · Top 50%
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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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 Purify: Block Ads and Tracking: 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
Optimize the blocking algorithm to improve performance and user experience.
Assumption to check: Users report issues with app performance when blocking many ads.
Validate with people who use this workflow before building.
Hypothesis 2
Introduce advanced settings to customize blocking behavior.
Assumption to check: Limited customization options for blocking preferences.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the subscription model and clearly communicate the benefits of each tier.
Assumption to check: Subscription model can be confusing to users.
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
Featured & recommended by CNBC, Wall Street Journal, BuzzFeed, NY Times, Huffington Post, and many more. Block ads & tracking with the most efficient blocker on the App Store. Browse 4x faster. Save 50% of your data usage. Browse in Peace™ with the easiest, most efficient blocker for Safari on iOS — load pages 4X FASTER and protect your privacy. #1 on the App Store worldwide in the paid apps category. #1 Productivity app in the U.S. and worldwide. Trusted and loved by hundreds of thousands of users, Purify is the best-selling blocker on the App Store. No more ads, tracking, or clutter — Purify is a breeze to install and works right out of the box. Here's why you'll love Purify: • Instantly browse an average of 4x FASTER • Reduce your web data consumption on Cellular & Wi-Fi by an average of 50% • Browse the web clutter-free — reclaim precious screen space • Ultimate privacy: Purify eliminates tracking — and never intercepts or sees any of your traffic • “a 21% battery life increase from using Purify... [when] web browsing”, “the test results spurred me to keep Purify” — The New York Times. ... PLUS best-in-class, high-quality support. It doesn't get any better. Purify is a content blocker for Safari that blocks ads, tracking, and more. Purify's professionally hand-crafted filter optimizes your browsing experience. With free regular updates, all users receive the best and latest of Purify at frequent intervals. Purify gives you complete control: whitelisting with Purify is effortless — just a tap from within Safari. Purify also syncs your preferences and whitelists via iCloud across all your devices. Unlock powerful blocking options with unprecedented ease — you can easily choose to block: • social buttons and comments • scripts • custom fonts • images ... and gain even more speed and data-usage benefits. Take full control of your browsing experience now with Purify. Some comments from users: — "Makes mobile browsing great again." — "Practically instant page loads." — "I've used every one of the content blockers so far and Purify is by far the best one." — "Love the simple experience." — "Take advantage of the much much better browsing experience." — "Installation was seamless... all ads are blocked and performance is stellar." — "I've tried dozens of adblock apps... Purify is in a league of its own."
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
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Zustand
axios
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.
