Source: https://seerepo.com/compare/ampproject/amphtml/vs/stenciljs/core
Markdown source: https://seerepo.com/compare/ampproject/amphtml/vs/stenciljs/core.md
Description: amphtml and core share 3 technologies: PostCSS, Autoprefixer, and css-what. amphtml is written in JavaScript and core in TypeScript.

# amphtml vs core

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

- [ampproject/amphtml](https://seerepo.com/r/ampproject/amphtml): The AMP web component framework.
- [stenciljs/core](https://seerepo.com/r/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.

## What they share and what sets them apart

- In common: PostCSS, Autoprefixer, css-what
- Only in amphtml: Express, GitHub, Preact, react-jss, cssnano, JSS, postcss-import, react-day-picker, @use-gesture/react, posthtml, dompurify, markdown-toc, Ajv, ajv-formats, morgan
- Only in core: postcss-safe-parser, postcss-selector-parser, prompts, parse5, pixelmatch

## Side by side

| | amphtml | core |
|---|---|---|
| Size | 703,086 lines written, 1,692 code files | 180,037 lines written, 595 code files |
| Who writes it | 0% of its commits signed by AI. With Claude Code and GitHub Copilot | 0% of its commits signed by AI. With GitHub Copilot and Claude Code |
| Activity | Last push October 20, 2026, 21,366 commits, 14,905 stars | Last push November 9, 2026, 8,382 commits, 13,153 stars |
| Tests | 2,103 test files. 47.1% of its code files have a test that imports them | 1,020 test files. 33.9% of its code files have a test that imports them |

- Size: Lines written by people and agents, without generated ones; code files, without tests.
- Who writes it: A commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch.
- Activity: From GitHub and its history, on the day SeeRepo read it.
- Tests: The files that test the code, and the share of code files a test imports.

## 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](https://github.com/ampproject/amphtml/tree/3961d2e011e1ce875554d3fd091870f21474d58e)

### Which has more GitHub stars, amphtml or core?

amphtml, with 14,905 stars; core has 13,153.

The proof: [ampproject/amphtml on GitHub](https://github.com/ampproject/amphtml)

### 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](https://github.com/ampproject/amphtml/tree/3961d2e011e1ce875554d3fd091870f21474d58e)

### 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](https://github.com/stenciljs/core/commits)

## Sources

- ampproject/amphtml: Read on November 8, 2026, at commit 3961d2e (https://github.com/ampproject/amphtml/tree/3961d2e011e1ce875554d3fd091870f21474d58e)
- stenciljs/core: Read on November 10, 2026, at commit bb880de (https://github.com/stenciljs/core/tree/bb880de3cf2f4428903ecbbd875f4b9cf37d5ce6)

## What is your repo built with?

Any public repo, with no account: https://seerepo.com/r/owner/repo/built, with the owner and name it has on GitHub.