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amphtml vs core

amphtml and core share 3 technologies: PostCSS, Autoprefixer, and css-what. amphtml is written in JavaScript and core in TypeScript.

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What they share and what sets them apart

ampproject

amphtml

The AMP web component framework.

JavaScript14.9kRead on November 8, 2026, at commit 3961d2eWhat is amphtml built with?

Only in amphtml

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.
amphtml703,086 lines written1,692 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.
amphtml0% of its commits signed by AIWith Claude Code and GitHub Copilot
core0% of its commits signed by AIWith GitHub Copilot and Claude Code
ActivityFrom GitHub and its history, on the day SeeRepo read it.
amphtmlLast push October 20, 202621,366 commits14,905 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.
amphtml2,103 test files47.1% 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, amphtml or core?
amphtml, with 703,086 lines written; core has 180,037.

The proof: ampproject/amphtml's code at commit 3961d2e

Which has more GitHub stars, amphtml or core?
amphtml, with 14,905 stars; core has 13,153.

The proof: ampproject/amphtml on GitHub

Which has more tests, amphtml or core?
amphtml, with 2,103 test files; core has 1,020.

The proof: ampproject/amphtml's code at commit 3961d2e

Which was updated more recently, amphtml or core?
core: its last push was on November 9, 2026, and amphtml's on October 20, 2026.

The proof: stenciljs/core's commits on GitHub

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