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
PageSpeed: SEO Audit & Speed
The Ultimate Website Performance Analysis Tool
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 5.0
3 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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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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 included15 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 PageSpeed: SEO Audit & Speed: 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
Offer more free analyses or increase visibility of premium features
Assumption to check: Limited free analyses per day
Validate with people who use this workflow before building.
Hypothesis 2
Provide educational content or tips alongside results
Assumption to check: Lack of detailed explanations for results
Validate with people who use this workflow before building.
Hypothesis 3
Use simpler language and visual aids for analysis results
Assumption to check: Difficulties in understanding technical jargon
Validate with people who use this workflow before building.
Hypothesis 4
Include social sharing options and export features for reports
Assumption to check: No sharing functionality for results
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
The Ultimate Website Performance Analysis Tool Transform your website optimization with PageSpeed Analyzer - the most comprehensive and intelligent performance testing app available. Whether you're a developer, marketer, or business owner, get instant insights into your website's speed, accessibility, and SEO performance. KEY FEATURES Complete Performance Analysis • Core Web Vitals - Measure First Contentful Paint, Largest Contentful Paint, and Cumulative Layout Shift • Comprehensive Scoring - Performance, Accessibility, Best Practices, SEO, and PWA assessments • Mobile & Desktop Testing - Analyze both device types with real Chrome simulation • Real User Metrics - Get field data from actual users alongside lab testing results AI-Powered Insights • Intelligent Analysis - Get personalized recommendations powered by advanced AI • Actionable Advice - Clear, specific guidance for both technical and non-technical users • Priority Recommendations - Focus on the most impactful improvements first Advanced Analytics • Detailed Metrics - Speed Index, Total Blocking Time, Time to Interactive, and more • Performance Opportunities - Identify unused CSS, JavaScript, and image optimization chances • Third-Party Services - Discover which external services impact your site performance • Screenshot Analysis - Visual page rendering insights with full-page screenshots Sitemap Intelligence • Automatic Discovery - Find and analyze your website's sitemap automatically • URL Status Checking - Verify all sitemap URLs for accessibility and performance • SEO Insights - Understand your site structure and indexing potential Professional Features • PDF Reports - Generate comprehensive, shareable performance reports • Analysis History - Track performance improvements over time • Share Extension - Analyze any website directly from Safari • Offline Caching - View previous results without internet connection PERFECT FOR • Web Developers - Optimize site performance and identify bottlenecks • SEO Specialists - Improve Core Web Vitals and search rankings • Digital Marketers - Ensure fast loading times for better conversions • Business Owners - Monitor website health and user experience • Agencies - Provide detailed performance reports to clients WHY CHOOSE PAGESPEED ANALYZER? Industry-Leading Technology • Powered by Google's PageSpeed Insights API • Uses real Chrome browser simulation • Incorporates Google's Core Web Vitals standards User-Friendly Design • Clean, intuitive interface • Real-time progress tracking • Beautiful visualizations and charts Professional Results • Detailed technical insights • Shareable PDF reports • Historical performance tracking GET STARTED TODAY Simply enter any website URL and get instant, comprehensive performance analysis. Our AI-powered insights will guide you through optimization opportunities, helping you create faster, more accessible websites that rank better and convert more visitors. Download PageSpeed Analyzer now and take your website performance to the next level! Payment will be charged to your Apple ID at confirmation of purchase. Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage and cancel your subscriptions in your Account Settings on the App Store after purchase. Any unused portion of a free trial is forfeited when purchasing a subscription. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://BigBalli.com/privacy
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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
Supabase
React Navigation
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.
