# Bootstrap Svelte vs Sveltestrap for Svelte 5

> Both projects provide Bootstrap 5 components for Svelte. The practical difference is whether you want a Svelte 5-first, TypeScript-authored API or a library that also supports Svelte 4 and keeps a classic Svelte component style.

Source: https://bootstrap-svelte.vercel.app/guides/compare-sveltestrap — part of the Bootstrap Svelte documentation (index: https://bootstrap-svelte.vercel.app/llms.txt).

Primary-source review completed August 26, 2026. Recheck package contracts before a migration.

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## Quick Comparison

| Decision point | Bootstrap Svelte | Sveltestrap |
| --- | --- | --- |
| Svelte support | Svelte `^5.29.0`; designed as a Svelte 5 library. | Svelte 4, Svelte 5, and the Svelte 5 prerelease range declared by its package. |
| API and typing | TypeScript-authored components, Svelte 5 runes, and composable namespaces such as `Modal.Root`. | Classic Svelte component APIs with flat exports and distributed declaration files. |
| Bootstrap assets | Install Bootstrap separately and import Bootstrap CSS or SCSS. Do not add Bootstrap JavaScript plugins. | Add Bootstrap CSS separately. Its README says Bootstrap JavaScript and jQuery are not required. |
| Component shape | Focused Bootstrap 5 layout, form, and component families with compound subcomponents. | A broad Reactstrap-style inventory with granular exports, including additional utility components. |
| SSR and testing evidence | Uses browser lifecycle guards and includes unit, interaction, accessibility, and targeted server-rendering tests. | Includes unit and SvelteKit integration fixtures; browser-only portal work is deferred to `onMount`. |

## Which Should You Choose?

- Choose **Bootstrap Svelte** for a Svelte 5-first codebase that values TypeScript-authored APIs, runes, compound component namespaces, and package documentation available as HTML and Markdown.
- Choose **Sveltestrap** when Svelte 4 compatibility, an existing Sveltestrap integration, or its classic flat component API is the stronger constraint.
- For overlays, portals, or a large migration, smoke-test SSR and hydration in your own SvelteKit deployment before committing.

## Primary Sources

- Bootstrap Svelte: [package contract](https://github.com/WinkIntel/bootstrap-svelte/blob/main/package.json), [installation and API guidance](https://github.com/WinkIntel/bootstrap-svelte/blob/main/README.md), and [component source and tests](https://github.com/WinkIntel/bootstrap-svelte/tree/main/src/lib).
- Sveltestrap: [package contract](https://github.com/sveltestrap/sveltestrap/blob/main/package.json), [installation guidance](https://github.com/sveltestrap/sveltestrap/blob/main/README.md), [component source](https://github.com/sveltestrap/sveltestrap/tree/main/src), and [Storybook documentation](https://sveltestrap.js.org/).