# Bootstrap vs Tailwind CSS: source lines of code compared

The Bootstrap vs Tailwind CSS comparison on OctoCounts shows side-by-side source line counts for twbs/bootstrap and tailwindlabs/tailwindcss, counted with the same engine and analysis options on the dates shown in the methodology line: files, total lines, code lines, comment lines, blank lines, and per-language totals, pinned to the exact commits listed below.

As of 2026-09-18, twbs/bootstrap contains 57,177 total lines (49,889 code) across 341 files, while tailwindlabs/tailwindcss contains 166,636 total lines (139,098 code) across 488 files as of 2026-09-15. tailwindlabs/tailwindcss is about 2.8x the size of twbs/bootstrap by code lines. Code size is not code quality: a larger count only means more source material, not a better or worse project.

| Metric | [twbs/bootstrap](https://octocounts.com/github/twbs/bootstrap) | [tailwindlabs/tailwindcss](https://octocounts.com/github/tailwindlabs/tailwindcss) |
| --- | ---: | ---: |
| Files | 341 | 488 |
| Total lines | 57,177 | 166,636 |
| Code lines | 49,889 | 139,098 |
| Comment lines | 2,957 | 12,751 |
| Blank lines | 4,331 | 14,787 |
| Languages counted | 9 | 12 |

Top languages in twbs/bootstrap: JSON (44.9% of code), Astro (23.6% of code), Sass (17.6% of code). Top languages in tailwindlabs/tailwindcss: TypeScript (83.8% of code), Rust (10.5% of code), YAML (3.5% of code). JSON, TypeScript appear in both top language lists; Astro, Sass, JavaScript appear only in twbs/bootstrap's top languages; Rust, YAML, CSS appear only in tailwindlabs/tailwindcss's top languages.

Methodology: both counts come from cached OctoCounts reports generated with tokei. twbs/bootstrap was counted at ref 9ef166cbdfdfa48638acae5ff9718f46c76e1342 (commit 9ef166cbdfdf) on 2026-09-18; tailwindlabs/tailwindcss was counted at ref 41d9cae8e53378d16087fcf359eb785c2fd42ce4 (commit 41d9cae8e533) on 2026-09-15. See the [counting methodology](https://octocounts.com/docs/methodology) for ignored directories and analysis options.
## About this comparison

twbs/bootstrap counts the Bootstrap repository: the SCSS source for its component styles, the CSS build pipeline, and the JavaScript plugins that accompany those components. tailwindlabs/tailwindcss counts the Tailwind CSS repository: the utility-CSS engine and its build tooling, core plugins, and documentation. Both are CSS-framework source trees, counted on the dates in the methodology line above.

The per-language tables reflect each project's center of gravity: Bootstrap's count is dominated by SCSS and component JavaScript — hand-maintained component styles — while Tailwind CSS's count centers on the engine and tooling that generate utility CSS at build time.

Both repositories carry documentation, tests, and fixtures alongside the distributable source, so part of each count exists to explain and verify the framework rather than to ship as CSS.

_These numbers say nothing about the CSS weight a real project ends up with: that depends on which components or utilities are used and on build-time compilation or purging, not on framework repository size._

Sources: [twbs/bootstrap repository](https://github.com/twbs/bootstrap) · [tailwindlabs/tailwindcss repository](https://github.com/tailwindlabs/tailwindcss). Statements verified 2026-09-16.

Evidence and next steps:

- [twbs/bootstrap SLOC report](https://octocounts.com/github/twbs/bootstrap)
- [tailwindlabs/tailwindcss SLOC report](https://octocounts.com/github/tailwindlabs/tailwindcss)
- [Compare twbs/bootstrap and tailwindlabs/tailwindcss interactively](https://octocounts.com/compare?left=https%3A%2F%2Fgithub.com%2Ftwbs%2Fbootstrap&right=https%3A%2F%2Fgithub.com%2Ftailwindlabs%2Ftailwindcss)

Note: code size is not code quality. OctoCounts only reports reproducible line counts and makes no claim that either project is better.

## Compare FAQ

### Which has more lines of code, twbs/bootstrap or tailwindlabs/tailwindcss?

tailwindlabs/tailwindcss has more code: 139,098 code lines versus 49,889 for twbs/bootstrap, about 2.8x as much, based on cached OctoCounts reports as of 2026-09-18.

### Does more source lines of code mean more complexity?

Not necessarily. SLOC measures size, not complexity, quality, or maintainability. A larger codebase can mean more features, more generated or vendored code, more verbose language idioms, or more tests — none of which imply the code is harder to work with. Use SLOC to gauge the scale of what you'd be reading or maintaining, not as a quality signal for twbs/bootstrap, tailwindlabs/tailwindcss, or any repository.

### How is this comparison calculated?

Methodology: both counts come from cached OctoCounts reports generated with tokei. twbs/bootstrap was counted at ref 9ef166cbdfdfa48638acae5ff9718f46c76e1342 (commit 9ef166cbdfdf) on 2026-09-18; tailwindlabs/tailwindcss was counted at ref 41d9cae8e53378d16087fcf359eb785c2fd42ce4 (commit 41d9cae8e533) on 2026-09-15. See the counting methodology for ignored directories and analysis options.

### Can I compare a different branch, tag, or commit?

Yes. This page shows the default branch for each repository. Use the interactive comparison tool to pick any public GitHub repository, branch, tag, or commit SHA for both sides and get a fresh side-by-side report.

## Related OctoCounts pages

- [Interactive repository comparison](https://octocounts.com/compare)
- [Recently analyzed repositories](https://octocounts.com/recent)
- [Popular SLOC reports](https://octocounts.com/popular)
- [Trending GitHub repositories](https://octocounts.com/trending)
- [Hall of Monoliths](https://octocounts.com/hall-of-monoliths)
- [Original research: how filtering changes SLOC counts](https://octocounts.com/research)
- [GitHub SLOC counter guide](https://octocounts.com/docs/github-sloc-counter)
- [Counting methodology](https://octocounts.com/docs/methodology)
- [SLOC and code metrics glossary](https://octocounts.com/docs/glossary)
- [OctoCounts API docs](https://octocounts.com/docs/api)