The questions we get most.
Honest answers, grouped by topic. If something is missing, contact us — we'll add it here so the next person finds it.
Getting started
Is there a free plan?+
VULK has a Free plan (100 credits/month on Basic models with a 256K effective context budget). Paid plans: Builder €19.99/mo, Pro €39.99/mo, Team €79.99/mo, Max €199/mo, Business €299/mo. Every paid plan unlocks every model — Claude Opus 4.7, GPT-5.5, Gemini 3.1 Pro, and more. Cancel any time.
What replaced the trial?+
VULK has a Free plan (100 credits/month on Basic models with a 256K effective context budget). Paid plans: Builder €19.99/mo, Pro €39.99/mo, Team €79.99/mo, Max €199/mo, Business €299/mo. Every paid plan unlocks every model — Claude Opus 4.7, GPT-5.5, Gemini 3.1 Pro, and more. Cancel any time.
Will the Free plan charge me automatically?+
VULK has a Free plan (100 credits/month on Basic models with a 256K effective context budget). Paid plans: Builder €19.99/mo, Pro €39.99/mo, Team €79.99/mo, Max €199/mo, Business €299/mo. Every paid plan unlocks every model — Claude Opus 4.7, GPT-5.5, Gemini 3.1 Pro, and more. Cancel any time.
Do you offer refunds?+
Yes — within 14 days of the first paid charge if you haven't consumed more than 25% of plan credits, no questions asked. See /refund-policy for details.
What you get out
Do I own the code?+
Completely. Every project exports as a clean repository — push to your own GitHub, host where you want, license however you want. There is no proprietary runtime, no built-with badge, no kill switch.
Can I cancel and keep my apps running?+
Yes. Once a project is exported (or deployed to your own Cloudflare / Vercel), it has zero runtime dependency on VULK. We could vanish tomorrow and your apps keep running.
What languages and frameworks?+
Web: React + Vite, Next.js 16. Mobile: Flutter (iOS + Android + web), React Native + Expo. 3D: Three.js. E-commerce: Shopify Liquid + App + Hydrogen. Backend: PostgreSQL with REST endpoints + Prisma.
Is there a CLI?+
Yes — and an MCP server, plus a public REST API. /downloads has the full list.
How generation works
Which AI models does VULK use?+
Generation routes per phase: a fast classifier, a heavy planner (Claude Opus / Gemini Pro class), a generation model tuned for the surface, and a repair model that reads compile errors. Specific model versions change as benchmarks change; routing policy is documented at /process.
Can I bring my own AI key (BYOK)?+
Yes, on Pro and above. Add your OpenRouter / Anthropic / Google / OpenAI key and routing uses it instead of our pool. You pay providers directly with no markup from us.
Will my prompts be used to train AI models?+
By default we route to providers configured for zero training. On Pro+ we additionally pin to no-training endpoints. On Business with BYOK, you control the policy directly with the provider.
How accurate is the output?+
Static checks + a real Vite / Flutter build run on every generation. If validation fails, the autofixer reads the actual compile error and surgically edits the failing files, looping up to three times. We surface failures honestly when they exceed that cap.
Going live
Where can I deploy?+
1-click to Cloudflare Pages, Vercel or Netlify. Multi-click to Railway / Fly.io / your own infra. Mobile builds hand off to EAS or native pipelines for App Store + Play Store.
Do you host my preview app?+
Yes — every preview runs in a Firecracker microVM on our infrastructure (eu-central-1). Previews are ephemeral; production deploys go to your account on Cloudflare / Vercel / Netlify or your own server.
How fast is the preview?+
Cold-boot a fresh microVM in under 4 seconds; subsequent reloads are HMR-fast. Generation itself depends on prompt scope, typically 30–120 seconds for a full app.
Privacy and EU
Where is my data stored?+
EU. PostgreSQL is in AWS RDS eu-central-1 (Frankfurt). Application servers are Hetzner Falkenstein. Static assets are global Cloudflare edge over HTTPS only.
Are you GDPR compliant?+
Yes. VULK is the data controller. DPA is available on request for Pro+. Sub-processors are listed at /security and notification on change is part of the DPA.
Working together
Can my team share a workspace?+
Yes, on Team and Business plans. Invite team members, share projects, audit log on Business.
How does SSO work?+
Business plan includes SAML / OIDC SSO with your IdP (Okta, Azure AD, Google Workspace, JumpCloud). Provisioning via SCIM is available on Enterprise terms.
Can I get an annual invoice?+
Yes — Stripe invoices in EUR or USD, NIPC / VAT applied automatically for EU billings.
Still wondering?
Email us — we read every message and update this page when a question keeps coming up.
Last reviewed: April 30, 2026