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.
Primary-source review completed August 26, 2026. Recheck package contracts before a migration.
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, installation and API guidance, and component source and tests.
- Sveltestrap: package contract, installation guidance, component source, and Storybook documentation.