Superforms vs Felte: Which SvelteKit Form Library Should You Use?

Two Solid Options, Different Philosophies

If you're building forms in SvelteKit, you'll likely choose between Superforms and Felte. Both are well-maintained, both handle validation, both have Svelte 5 support. The difference is architectural philosophy — and that determines which fits your project better.

Superforms: Server-First Architecture

Superforms was built specifically for SvelteKit's form actions. It assumes you have a server, you want progressive enhancement, and you want the server to be the source of truth for validation.

How It Works

You define a Zod schema once. The server validates on submission via superValidate(request, zod(schema)). The client optionally re-validates using the same schema via validators: zod(schema). The form state (values, errors, constraints) flows through SvelteKit's load/action cycle.

Key Strengths

• Progressive enhancement — forms work without JavaScript. The use:enhance directive adds client-side submission when JS is available, but the form functions as a standard HTML POST form without it.
• Server-side messages — the message() helper returns success/error feedback from the server, surviving page reloads and back-button navigation.
• Multi-form pages — supports multiple independent forms on a single page with named actions, each with its own schema and state.
• Flash messages — built-in flash message support via cookies for post-redirect-get patterns.
• Nested data — handles nested objects and arrays in form data natively.

Trade-offs

• Requires SvelteKit (not usable in standalone Svelte or other frameworks)
• Tightly coupled to the load/action pattern — less flexible for API-driven forms
• Learning curve around the superValidate / superForm / message API surface

Felte: Client-First Architecture

Felte takes a different approach. It manages form state entirely on the client, with optional server submission. It doesn't assume SvelteKit, form actions, or any specific server framework.

How It Works

You create a form store with createForm(), bind inputs to it, and configure validators (Zod, Yup, Superstruct, or custom). The form state lives in client-side stores. Submission is handled via a custom onSubmit callback — typically a fetch call.

Key Strengths

• Framework-agnostic — works in standalone Svelte, SvelteKit, or any environment where Svelte components run.
• Multiple validator support — use Zod, Yup, Superstruct, or write custom validators. Mix and match.
• Simpler mental model for client-only forms — no server state sync to reason about.
• Field-level validation — validate individual fields on blur/change without validating the full form.

Trade-offs

• No built-in progressive enhancement — forms require JavaScript
• No server-side validation integration — you handle that separately in your API
• No flash message support
• More boilerplate for SvelteKit form action integration

Head-to-Head Comparison

Feature	Superforms	Felte
Progressive enhancement	Built-in	Manual
Server validation	Integrated	Separate
Client validation	Via same schema	Multiple adapters
SvelteKit form actions	Native	Manual
Svelte 5 support	Yes (v2)	Yes
Works without SvelteKit	No	Yes
Flash messages	Built-in	No
Multi-form pages	Built-in	Manual
Nested data	Built-in	Via reporter

When to Use Which

Use Superforms when:

• You're building a SvelteKit application with server-side rendering
• Progressive enhancement matters (accessibility, SEO, reliability)
• You want the server to own validation truth
• You need flash messages or multi-form pages
• You're building a production app with form actions

Use Felte when:

• You're building a client-heavy SPA without server form actions
• You need to work outside SvelteKit (standalone Svelte app, Electron, etc.)
• You want to use Yup or Superstruct instead of Zod
• Your forms submit to external APIs rather than same-origin form actions

Why SvelteForms Uses Superforms

SvelteForms generates Superforms + Zod code because Superforms is the standard for SvelteKit production apps. The generated output includes the Zod schema, server action, and client component — all three files that Superforms requires. The code follows Superforms v2 patterns and works with SvelteKit 2 and Svelte 5.

If your project needs Felte instead, the generated Zod schema from SvelteForms is still usable — Felte has a Zod adapter, so you can take the schema.ts file and use it directly. You'd just need to replace the Superforms component boilerplate with Felte's createForm pattern.

Try the form builder to generate your next form's boilerplate in seconds, or browse the code examples to see what the output looks like.