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ui vs core

ui and core share 3 technologies: PostCSS, prompts, and postcss-selector-parser. Both are written in TypeScript.

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What they share and what sets them apart

shadcn-ui

ui

Composable, accessible components with thoughtful defaults. Build your own component library with code you can customize, extend, and make your own.

TypeScript127.7kRead on November 9, 2026, at commit 8ab2771What is ui built with?

Only in ui

In common

stenciljs

core

A toolchain for building scalable, enterprise-ready component systems on top of TypeScript and Web Component standards. Stencil components can be distributed natively to React, Angular, Vue, (+ more) and traditional web applications from a single, framework-agnostic codebase.

TypeScript13.2kRead on November 10, 2026, at commit bb880deWhat is core built with?

Only in core

Side by side

SizeLines written by people and agents, without generated ones; code files, without tests.
ui636,360 lines written3,888 code files
core180,037 lines written595 code files
Who writes itA commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch.
ui2.9% of its commits signed by AIWith Claude Code, Cursor, GitHub Copilot, Codex, and Devin
core0% of its commits signed by AIWith GitHub Copilot and Claude Code
ActivityFrom GitHub and its history, on the day SeeRepo read it.
uiLast push November 8, 20262,308 commits127,657 stars
coreLast push November 9, 20268,382 commits13,153 stars
TestsThe files that test the code, and the share of code files a test imports.
ui415 test files3.8% of its code files have a test that imports them
core1,020 test files33.9% of its code files have a test that imports them

Frequently asked questions

Which is bigger, ui or core?
ui, with 636,360 lines written; core has 180,037.

The proof: shadcn-ui/ui's code at commit 8ab2771

Which has more GitHub stars, ui or core?
ui, with 127,657 stars; core has 13,153.

The proof: shadcn-ui/ui on GitHub

Which has more tests, ui or core?
core, with 1,020 test files; ui has 415.

The proof: stenciljs/core's code at commit bb880de

Which was updated more recently, ui or core?
core: its last push was on November 9, 2026, and ui's on November 8, 2026.

The proof: stenciljs/core's commits on GitHub

Which has more commits signed by AI, ui or core?
ui: an AI signed 2.9% of its commits, with Claude Code, Cursor, GitHub Copilot, Codex, and Devin.

The proof: the commits each tool signed in shadcn-ui/ui

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