Impeccable

Detect common UI anti-patterns in any web page

Impeccable detects 41 common UI anti-patterns directly in your browser. Open DevTools on any page and overlays instantly highlight issues, from AI-generated design tells to accessibility and quality problems. WHAT IT DETECTS AI slop (design tells that scream "AI made this"): - Cream and beige "AI default" backgrounds - Purple/violet AI color palettes - Gradient text on headings - Side-tab and rounded-border accent stripes - Nested cards, monotonous spacing, icon-tile stacks - Bounce and elastic easing, hover image zoom - Dark mode with glowing accents - Overused or single-family fonts, flat type hierarchy - Oversized H1s, extreme negative letter-spacing, italic-serif heroes - Uppercase eyebrows, repeated kickers, numbered section markers - Em-dash overuse, marketing buzzwords, "not just X, it's Y" cadence - Thin borders with wide drop shadows, repeating-stripe backgrounds Quality issues (general design and accessibility): - Low contrast text (WCAG AA), gray text on colored backgrounds - Cramped padding, tight line height - Skipped heading levels - Line length too long, text running to the viewport edge - Tiny body text, justified text, all-caps body copy, wide letter-spacing - Layout-property animations, clipped overflow containers, text overflow - Broken images HOW IT WORKS 1. Install the extension 2. Open DevTools on any page (Cmd+Opt+I / F12) 3. Overlays appear automatically, highlighting issues 4. Click the "Impeccable" panel tab for a structured list of all findings 5. Click any finding to jump to the element in the Elements panel FEATURES - Auto-scans when DevTools opens, no manual step needed - Grouped findings: AI tells vs. quality issues - Click-to-inspect: jump from a finding to the element - Toggle overlays on/off from the panel or toolbar popup - Per-rule settings: disable detections you don't care about - Re-scans on navigation, including SPA route changes - Works on any website - Runs 100% locally, no data sent anywhere Open source at https://github.com/pbakaus/impeccable