AI form building, made transparent.
We built Vellform because creating forms shouldn't be a choice between tedious manual configuration and opaque black-box AI. You describe what you need, watch every edit on a typed schema, and keep full manual control.
Why we built Vellform
Traditional form builders are slow and manual. Generic AI tools produce un-editable black boxes. Vellform combines AI speed with deterministic precision.
Read before write
The assistant inspects existing logic, dependencies, and questions before making any edits so rules never silently break.
Structured data, never code
Forms are strongly typed schemas, not generated JavaScript. Every change is an atomic, validated AST mutation.
Visible step history
Every tool call and argument is streamed live to your transcript, backed by instant one-click rollback to any revision.
How the engine works
Three predictable stages between your plain-English prompt and a published, fully functional form.
Inspect & Scope
The agent checks your schema's existing fields, pages, and logic, then scopes its tools to prevent unintended edits.
Deterministic Edit
Emits discrete, validated JSON schema patches — adding questions, conditions, or themes with zero runtime code risks.
Live Stream & Undo
The canvas refreshes in real time, logging every tool argument in your transcript with instant one-click rollback.
Built with clear boundaries
Everything you need to know about our standards, data commitments, and product integrity.
Native Delivery
Signed webhooks, email alerts, Slack, Discord, and Google Sheets — direct and reliable with no middleware required.
Quarantined Answers
Submissions and respondent personal data are strictly isolated and never fed back into AI models.
Zero Lock-In
Your forms and submissions belong to you. Export complete JSON schemas and CSV response sheets in one click.
Honest Metering
All features (logic, themes, integrations) are included on every tier. Credits only meter AI generation.
Ready to explore the platform?
Start on the free tier with 25 AI credits every month, no credit card required.