Icon

1. 01Responsiveness — The flexibility in detail of the icons at varying sizes
2. 02Visual style consistency — All icons share the same stroke weight, corner radius, and optical sizing approach
3. 03Color — Black and white, flat colors or gradients
4. 04Naming — Name an icon by what it literally is so it can be used flexibly

Checks from checklist.design, MIT.

• Astryx · Meta's open-source React + StyleX design system, 150+ components and 42 templatesComponent LibrariesS
• Chakra UI · 114 accessible React components with a token-driven styling systemComponent LibrariesS
• The Component Gallery · 60 UI components cross-referenced against 95 real design systemsDesign Systems & Brand GuidelinesS
• Heroicons · 324 MIT SVG icons in four sizes, from the Tailwind CSS teamIcons & LogosS
• Iconify · 236 icon sets and 333,975 icons behind one syntax and one free public APIIcons & LogosS
• Lucide · 1,768 ISC-licensed stroke icons; the shadcn/ui default setIcons & LogosS
• Lucide Animated · 467 MIT Lucide icons that animate on hover, with a markdown page for every icon and a skill file written for an agentIcons & LogosS
• Mantine · 150+ styled React components, 70+ hooks, CSS modules, no runtime CSS-in-JSComponent LibrariesS
• MUI · React component suite: Material UI, MUI X data grid, charts and date pickersComponent LibrariesS
• Phosphor Icons · 1,512 MIT icons in six weights, from Thin to DuotoneIcons & LogosS
• Radix UI · Unstyled accessible React primitives, plus Themes, Colors and IconsComponent LibrariesS
• React Bits · 234 copy-paste animated React components: text effects, cursors, WebGL backgroundsMotion & InteractionS
• remocn · 282 Remotion components for product-demo video, installed by the shadcn CLIMotion & InteractionS
• ReUI · 1,052 free shadcn components, 502 pro blocks, 10 templates, hosted MCPComponent LibrariesS
• Simple Icons · 3,453 CC0 brand logos with official hex colours and a free colour-aware CDNIcons & LogosS
• Untitled UI · Figma UI kit plus React Aria + Tailwind v4 component library with an MCP serverComponent LibrariesS
• Ant Design · 73-component React library and design language for enterprise back-office appsComponent LibrariesA
• Atlassian Design System · Atlaskit: 59 Apache-2.0 React components behind Jira, Confluence and BitbucketDesign Systems & Brand GuidelinesA
• Boxicons · MIT-licensed icon set, ~3,768 icons in outline, solid and brand stylesIcons & LogosA
• Chánh Đại Components · 96-item shadcn registry of pixel-perfect portfolio and marketing componentsComponent LibrariesA
• Design System Checklist · 232-item open-source checklist for design language, foundations and componentsDesign Systems & Brand GuidelinesA
• Design Systems Surf · Database of ~90 public design systems, cross-cut by component and by foundation topicDesign Systems & Brand GuidelinesA
• Fluent 2 · Microsoft's design system: 47 web components plus Windows, iOS and Android kitsDesign Systems & Brand GuidelinesA
• Font Awesome · 2,883 free icons plus 609 brand marks; the full library is a paid subscriptionIcons & LogosA
• gluestack-ui · CLI-installed React Native component library built on NativeWind and Tailwind v4Component LibrariesA
• Heroicons Animated · 316 Heroicons rebuilt as Motion-animated React componentsIcons & LogosA
• Iconer · 36 open-source icon libraries, 33,271 icons, searchable in one placeIcons & LogosA
• Iconoir · 1,671 MIT-licensed SVG icons on a 24px grid, with React, Vue and Flutter packagesIcons & LogosA
• interior.dev · 54 MIT micro-interaction components for React, installable as a shadcn registryMotion & InteractionA
• Irasutoya · 25,415 free Japanese kawaii illustrations, 239 categories, public Blogger JSON feedTextures, Backgrounds & AssetsA
• Its Hover · 263 animated React icons installed one at a time via the shadcn CLIIcons & LogosA
• Lordicon · 48,100+ hand-animated icons in Lottie, GIF, SVG, and more, with a web component, React package, and APIIcons & LogosA
• Magic UI · 150+ animated shadcn-compatible React components for landing pagesMotion & InteractionA
• MingCute Icons · 1,663 icons in regular and filled, shipped as 10 framework packagesIcons & LogosA
• Open UI · W3C Community Group research and specs for native, styleable HTML controlsDesign Systems & Brand GuidelinesA
• Osmo · Paid vault of 231 GSAP/Webflow interaction recipes plus a 100-button packMotion & InteractionA
• Radix Icons · 318 crisp 15x15 icons, MIT, one React component eachIcons & LogosA
• Remix Icon · 3,231 neutral 24x24 system icons in Line and Fill, under a custom non-OSI licenceIcons & LogosA
• shadcn-templ · shadcn/ui ported to Go and templ: 52 components, 27 blocks, its own CLIComponent LibrariesA
• shadcncraft · Paid shadcn/ui registry plus a 1:1 Figma kit, 8 styles across Radix and Base UIComponent LibrariesA
• Shopify Polaris · Shopify's admin design system, now shipped as framework-agnostic web componentsComponent LibrariesA
• Streamline · 447,000+ icons in 34 families, plus illustrations, with an API and an MCP serverIcons & LogosA
• Subframe · Visual editor that emits React + Tailwind + Radix code, with an MCP serverAgent Design ToolingA
• SVGL · 665 optimized brand logos as SVG, with a free JSON APIIcons & LogosA
• Tabler Icons · 6,184 MIT icons on a 24x24 grid, outline and filledIcons & LogosA
• Tamagui · Universal React styling engine, optimizing compiler and ~48 components for web and nativeComponent LibrariesA
• unlumen UI · Freemium shadcn registry of Motion-driven React componentsComponent LibrariesA
• useAnimations · 298 free MIT animated Lottie icons with a React package, a shadcn registry, and an agent catalogIcons & LogosA
• Watermelon UI Dashboards · Nine full React admin dashboards installed through the shadcn CLI from a public registryBlocks, Templates & ThemesA
• All SVG Icons · 380,000+ free SVG icons from 238 open-source packs, with free SVG tools and an MCP server for agentsIcons & LogosB
• Amicons · 760 icons in 3,040 variants on a 24px grid, Figma and SVG, one-time priceIcons & LogosB
• DrawKit · 100+ hand-drawn 2D/3D illustration, icon and Lottie packs; ~40 free, rest behind ProTextures, Backgrounds & AssetsB
• Feather Icons · 287 MIT-licensed 24x24 stroke icons, the original minimal-outline setIcons & LogosB
• FigComponents · 1,619 copy-paste Figma components, 1,002 of them free, CC BY 4.0Blocks, Templates & ThemesB
• Hugeicons · 59,000+ icons across 9 styles; 5,900 free under CC0, rest is paidIcons & LogosB
• Hugeicons Animated · 165 hand-animated Hugeicons installed as React source via the shadcn CLIIcons & LogosB
• Isocons · Free isometric SVG icon set, three perspectives, CC BY 4.0Icons & LogosB
• Lukasz Adam Illustrations · ~120 free CC0 SVG illustration and icon sets, one Gumroad bundle, no attributionTextures, Backgrounds & AssetsB
• morphicons · Six kilobytes of maths that morph any stroke icon into any other, across Lucide, Heroicons and TablerIcons & LogosB
• Park UI · 59 styled Ark UI components delivered by CLI, themed with Panda CSSComponent LibrariesB
• Primer · GitHub's design system: 62 React components, Octicons and design tokensDesign Systems & Brand GuidelinesB
• Quiver · Foundation models that generate and vectorise editable SVGGenerative Media ToolsB
• shadcncraft Free · 22 shadcncraft registry items that install with the plain shadcn CLI, no licence keyComponent LibrariesB
• Smallbits · 290+ free pixel icons drawn on a strict 8x8 gridIcons & LogosB
• SVGator · Online SVG animation editor that exports animated SVG, Lottie, GIF, and video, with an MCP for AI agentsMotion & InteractionB
• Untitled UI on GitHub · The MIT source repos behind Untitled UI: components, icons, and 3 starter kitsComponent LibrariesB
• css.gg · 704 icons drawn in pure CSS — but the licence since v2.1.2 forbids commercial useIcons & LogosC
• Flaticon Animated Icons · 57,000+ animated icons in Lottie JSON, GIF, MP4, SVG, and After Effects formats, free with attributionIcons & LogosC
• Icons8 · ~1.3M icons in 47 styles, free only under CC BY-ND with a mandatory backlinkIcons & LogosC
• SVG Doodles · ~209 abstract doodle SVGs exportable as JSX, Vue, Svelte, Astro or PNGIcons & LogosC