Vellum: Themes, Backgrounds & Widgets for ChatGPT & Claude

44 animated themes and backgrounds for ChatGPT & Claude. Pixel-art widgets, custom themes, focus mode, and fonts.

44 handcrafted themes for Claude and ChatGPT. Animated backgrounds, dark modes, and living wallpapers for your AI workspace. WHAT YOU GET 12 free themes included, no account needed 32 Pro themes with animated backgrounds — falling cherry blossoms, northern lights, a retro synthwave grid, deep space star fields, and more Works on both Claude (claude.ai) and ChatGPT (chatgpt.com) Themes apply instantly with one click Your selection syncs across devices ENSURE DARK MODE IS ACTIVATED IN SETTINGS HOW IT WORKS Click the Vellum icon in your toolbar. Pick a theme. Done. Every theme recolours the entire interface, sidebar, chat area, composer, buttons, all using the platform's own design system, so nothing looks broken or half-styled. Pro themes add subtle animated backgrounds: particles, weather, cosmic effects, even a tiny T. rex runner from the Chrome offline game. Animations use minimal CPU and never distract from your conversation. FREE THEMES 12 free themes included, no account needed. Covers a range of dark, warm, and cool colour palettes. PRO THEMES Include 32 animated backgrounds ranging from atmospheric nature scenes and cosmic effects to retro aesthetics and interactive environments. New themes are added regularly and included for all Pro members at no extra cost. PRIVACY Vellum collects zero data. No analytics, no tracking, no telemetry. Runs entirely in your browser. Theme preferences sync through Chrome's built-in storage and nothing else. PRICING Free tier is free forever. Pro is £2.20/month or £12.95 for lifetime access. New themes are added regularly and included for all Pro members at no extra cost.