Valibot + ArkType

Zod alternatives

FreeLibraries & build toolingvalibot.dev

What it is

Two Zod alternatives that implement the same Standard Schema interface, so they plug into React Hook Form and TanStack the same way. Valibot (v1) is modular and tree-shakes to under 2KB. ArkType (v2) lets you write schemas as TypeScript-like syntax strings.

Why it earns a slot

Valibot when every kilobyte counts — edge functions, embeddable widgets. ArkType when you want schemas that read like the types they produce. Standard Schema means switching later is cheap.

Know before you commit

Both have far less training data than Zod, so AI-generated code for them is more often wrong. Valibot's per-function import style is verbose.

Getting started

npm install valibot

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Pricing snapshot

Free · MIT

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Drop into your Lovable chat

Evaluate Valibot + ArkType (https://valibot.dev) for this project, then use it only if it fits what we are already building.
Context: Zod alternatives. Two Zod alternatives that implement the same Standard Schema interface, so they plug into React Hook Form and TanStack the same way. Valibot (v1) is modular and tree-shakes to under 2KB. ArkType (v2) lets you write schemas as TypeScript-like syntax strings.
Reviewer notes (general, not written for this codebase): Valibot when every kilobyte counts — edge functions, embeddable widgets. ArkType when you want schemas that read like the types they produce. Standard Schema means switching later is cheap.
Watch out for: Both have far less training data than Zod, so AI-generated code for them is more often wrong. Valibot's per-function import style is verbose.
Pricing: Free · MIT
Setup: npm install valibot
Rules: treat the notes above as background only. Do not assume a theme, style, layout or feature that is not already in this project — inspect the existing code first and ask me before changing visual direction.

/api/public/tools/valibot-arktype

Neighbourhood

How Valibot + ArkType sits against the rest of the atlas — swaps, companions and the tools builders actually save alongside it.