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AI tools that help frontend developers audit Core Web Vitals, research npm packages, screenshot competitor UIs, and ship accessible interfaces faster.
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LCP
4.2s — 1.8MB hero JPEG loaded eagerly
CLS
0.24 — Google Font causes layout shift
FID
180ms — 340KB analytics bundle blocks main thread
Render-blocking
3 scripts — Google Tag, Intercom, Stripe.js
Fix priority
Convert hero to WebP · preconnect fonts · defer analytics
Core Web Vitals performance auditing
Run Lighthouse-style audits on any page to surface LCP, CLS, FID, and TTFB regressions before they hit production. Get a prioritized fix list — oversized images, render-blocking scripts, layout shifts from late-loading fonts — without manually running DevTools on every build.
Audit https://shop.example.com/checkout — I need CWV scores, the top render-blocking resources, and image optimization opportunities.
LCP: 4.2s (poor) — largest element is a 1.8MB hero JPEG loaded eagerly. CLS: 0.24 (poor) — late-loading Google Font causes layout shift. FID: 180ms — main thread blocked by 340KB analytics bundle. Top fix: convert hero to WebP with explicit width/height, preconnect to fonts.googleapis.com, defer analytics script.
ToolRouter analyze_url
LCP
4.2s — oversized hero JPEG
CLS
0.24 — late-loading Google Font
FID
180ms — 340KB analytics bundle
Top fix
Convert hero to WebP with explicit width/height
Competitor UI pattern research
Screenshot production UIs at specific viewport widths to study responsive nav patterns, hero layouts, and CTA placement. Reference real screenshots in design reviews instead of describing from memory.
Capture the homepage of linear.app, vercel.com, and stripe.com at 375px viewport. I want to compare their mobile nav and CTA button placement.
Captured all three. Linear: full-bleed dark hero, single centered CTA, hamburger reveals full-screen overlay. Vercel: split layout with animated code terminal, nav collapses to icon-only. Stripe: gradient background with product screenshot, sticky nav with reduced logo on scroll.
npm package evaluation before adoption
Look up version-specific docs, compare bundle sizes, and check breaking changes before committing the codebase to a new dependency. Avoid the surprise of migrating off a library two sprints later.
Compare react-query v5 vs SWR v2 for data fetching in a Next.js 14 app — I care about bundle size, TypeScript ergonomics, and optimistic update patterns.
SWR v2: 4.2kB gzipped, clean TypeScript generics, optimistic updates via mutate(). React Query v5: 13kB but richer devtools, built-in mutation state machine, better for complex server state. For Next.js 14 Server Components with REST APIs, SWR wins on size; React Query wins on DX for mutation-heavy apps.
Accessibility and SEO meta auditing
Catch missing alt text, broken heading hierarchy, duplicate meta descriptions, and absent canonical tags before PRs merge. Frontend developers own the HTML output — these issues are yours to fix.
Audit https://myapp.com/about — I need meta tags, heading structure, image alt text, and canonical URL checked.
Issues: missing OG image (og:image absent), h1 appears twice, 3 product images have empty alt="" attributes, no rel=canonical. Meta description is 182 chars (truncates at 160). Fix priority: add canonical, fix duplicate h1, set descriptive alt text on product images.
ToolRouter analyze_page
og:image
Missing
h1 tags
Duplicate — appears twice
Alt text
3 images with empty alt=""
Canonical
rel=canonical absent
Meta description
182 chars — truncates at 160
Component architecture diagrams
Generate component tree, data flow, and routing diagrams from a text description. Share visual architecture docs with designers and PMs without spinning up a separate Figma or diagramming tool.
Create a Mermaid flowchart for our Next.js app: public landing → login → dashboard with Overview, Projects, and Settings tabs. Settings has nested Profile, Billing, and Team routes.
Generated flowchart with 9 nodes. Auth guard sits between public and dashboard. Dashboard shell has three tab children. Settings expands to Profile, Billing, Team sub-routes with protected-route annotations on each.
ToolRouter render_diagram
Public
Landing page
Auth
Login → auth guard
Dashboard
Overview · Projects · Settings
Settings
Profile · Billing · Team (protected)
Color system and accessibility token generation
Generate full tint/shade scales from a brand hex color, check WCAG contrast ratios for text/background pairs, and build accessible color tokens before implementing a design system.
My brand primary is #3B82F6. Give me the full 50–900 scale and flag which combos meet WCAG AA contrast for body text.
Generated 11-step scale from #EFF6FF (50) to #1E3A8A (900). For body text (#111): 50-400 fail AA. 500 (#3B82F6) on white fails AA (3.1:1). 600 (#2563EB) passes AA on white (4.6:1). 700–900 all pass AAA. Recommend 600 as minimum for interactive text.
ToolRouter get_palette
50–400 on white
Fail AA — contrast below 4.5:1
500 (#3B82F6) on white
3.1:1 — fails AA for body text
600 (#2563EB) on white
4.6:1 — passes AA ✓
700–900 on white
All pass AAA (7:1+)
Ready-to-use prompts
Audit checkout performance
Run a Lighthouse performance audit on https://myapp.com/checkout. Report LCP, CLS, FID, and TTFB scores. List the top 5 render-blocking resources and image optimization opportunities ranked by estimated impact.
Compare SWR vs React Query
Fetch the latest docs for SWR v2 and React Query v5. Compare bundle size, TypeScript generics, optimistic update patterns, and Next.js 14 App Router compatibility.
Screenshot competitor mobile nav
Take screenshots of linear.app, notion.so, and github.com at 375px viewport width. I want to compare their mobile navigation patterns and sticky header behavior.
SEO and a11y page audit
Audit https://myapp.com/product/123 for accessibility and SEO issues. Check: heading hierarchy, image alt text, meta description length (max 155 chars), canonical URL presence, and Open Graph tags.
Generate component tree diagram
Generate a Mermaid flowchart for a React e-commerce product page: ProductPage → ImageGallery, ProductInfo (title, price, AddToCart button), ReviewSection → ReviewCard (repeated n times), and RelatedProducts carousel.
Brand color WCAG check
I have brand primary #6366F1. Generate the full 50–900 tint scale and check which color combinations meet WCAG AA (4.5:1) and AAA (7:1) contrast ratios for use as body text on white backgrounds.
React 19 breaking changes
Fetch the React 19 upgrade guide. I need the breaking changes for useEffect cleanup timing, ref as prop, and the new use() hook API. Show migration code examples.
Vite vs webpack bundle analysis
Fetch the latest Vite 5 migration docs and compare its module federation support and build performance vs webpack 5 for a large React app with 200+ components.
Tools to power your best work
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Generate ImageAI image generation, 20+ models
Web ScreenshotScreenshot any page at any viewport
TranslateAccurate translation, 30+ languages
Library DocsUp-to-date docs and code examples for any library
Diagram GeneratorRender Mermaid, PlantUML & more
Color ToolsPalettes, contrast, and color info
165+ tools.
One conversation.
Everything frontend developers need from AI, connected to the assistant you already use. No extra apps, no switching tabs.
Pre-deploy performance and SEO check
Before merging a feature branch, audit changed pages for CWV regressions, missing meta tags, and visual consistency against production.
Library evaluation before adoption
Thoroughly vet a new npm package before locking the codebase in — docs, bundle cost, and known issues.
Design system component spike
Research, spec, and document a new design system component from competitor patterns through color tokens to architecture diagram.
Frequently Asked Questions
How does Page Speed Test differ from running Lighthouse in Chrome DevTools?
Page Speed Test audits from a neutral server environment — no cached assets, no browser extensions inflating scores. This gives you scores closer to what real users experience on cold loads. It also lets you audit competitor URLs that you cannot open in your own DevTools.
Can Library Docs look up version-specific React APIs, not just the latest?
Yes. Specify the version in your prompt — for example "React 17 componentDidMount lifecycle" or "Next.js 13 getServerSideProps" — to get accurate, version-matched documentation rather than docs that may reference breaking changes in later releases.
Can I use Web Screenshot to capture sites that require login?
Web Screenshot captures public URLs without authentication. Use it to research competitor public-facing pages, documentation sites, or marketing pages. For authenticated views, capture staging or use it to document the login flow itself.
Does the SEO tool check accessibility as well as search engine issues?
Yes. The SEO analysis tool checks heading hierarchy, alt text presence, and meta tag completeness — all of which overlap with accessibility requirements. For deeper WCAG auditing, combine it with the Page Speed Test accessibility report.
Can Diagram Generator output code I can paste into Notion or Confluence?
Yes. It outputs Mermaid, PlantUML, and Graphviz source code that renders natively in Notion, Confluence, GitHub, and GitLab. Paste the raw diagram source into a code block and these platforms render it automatically.
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