Vellum: Themes, Backgrounds & Widgets for ChatGPT & Claude

Tracking since May 13, 2026.

Changelog

• Jun 7, 2026
  description

  44 handcrafted themes for Claude and ChatGPT. Animated backgrounds, dark modes, and living wallpapers for your AI workspace.
  
  Vellum adds 44 beautiful themes to Claude and ChatGPT - turning your plain AI workspace into something you actually enjoy looking at.
  
  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
  
  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 — 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
  Default, Graphite, Sage, Oat, Slate, Drift, Carbon, Plum, Mocha, Ember, Fog, Pine
  
  PRO THEMES (32)
  Sakura, Aurora, Midnight, Matrix, Forest, Synthwave, Inferno, Galaxy, Glacier, Vapor, Velvet, Ocean, Neon, Cosmos (interactive — moves with your mouse), Dino (Chrome T-Rex runner), Stardust, Constellation, Rainfall, Fireflies, Lava, Nebula, Storm, Mountains, Lantern, Vortex, Origami, Halo, Twilight, Petal, Supernova, Raindrop, Northern
  
  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 $2.99/month or $24.99 for lifetime access. New themes are added regularly and included for all Pro members at no extra cost.
  
  Built with care, in London.

  44 handcrafted themes for Claude and ChatGPT. Animated backgrounds, dark modes, and living wallpapers for your AI workspace.
  
  Vellum adds 44 beautiful themes to Claude and ChatGPT - turning your plain AI workspace into something you actually enjoy looking at.
  
  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
  
  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 — 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 $2.99/month or $24.99 for lifetime access. New themes are added regularly and included for all Pro members at no extra cost.

• Jun 7, 2026
  short_description

  Beautiful, minimal themes for Claude and ChatGPT. Transform your AI workspace with refined animated themes.

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

• Jun 7, 2026
  name

  Vellum — AI Workspace Themes

  Vellum: Themes, Backgrounds & Widgets for ChatGPT & Claude

• Jun 7, 2026
  host_permissions

  https://claude.ai/*, https://chatgpt.com/*, https://chat.openai.com/*, https://api.lemonsqueezy.com/*

  https://claude.ai/*, https://chatgpt.com/*, https://chat.openai.com/*, https://api.polar.sh/*

Permissions & access

Permissions

storageactiveTab

Host access

https://claude.ai/*, https://chatgpt.com/*, https://chat.openai.com/*, https://api.polar.sh/*

Screenshots