Fillo has two front doors. People sign up with an emailed sign-in link at fillo.so/signup. Coding agents provision a live, capped preview workspace from the terminal — no browser, no form — and hand their developer a claim link that saves it to an account. Neither path asks for a card.
Sign up with an email link
- Open /signup and enter your work email.
- Fillo emails you a sign-in link. There is no password at signup.
- Click the link. That one click verifies the address, signs you in, and lands you in the dashboard.
The same flow signs in a returning address — one account per email, whether it was created here, through Google or GitHub, or by claiming an agent-provisioned workspace. Continue with Google and Continue with GitHub are available on the same page.
You can also build first and sign up later: the form editor keeps a guest draft in your browser until you sign in and claim it.
Agents: provision a workspace from the terminal
An agent (or any script) can create a working Fillo workspace without rendering the signup form. Run this from the project the agent is editing, with the developer's email:
npx @usefillo/cli@latest agent bootstrap --email you@company.comOne command provisions a preview workspace, signs the CLI into it, installs the Build with Fillo skill, and prints the workspace's pk_ publishable key. The workspace is live immediately — published forms accept real responses — with preview caps until it is claimed: up to 3 forms, 10 responses in total, and a 14-day hold. The email receives a private link; opening it saves the workspace to an account and lifts the preview caps to the free plan's limits.
If the developer already has a Fillo account, skip provisioning and connect it instead:
npx @usefillo/cli@latest loginThe same loop is available as MCP tools (fillo_provision_workspace, fillo_push_form, fillo_claim_status) via npx -y @usefillo/mcp — see MCP setup. Machine-readable starting points for everything else are indexed at /llms.txt.
What you get without paying
The free plan needs no card: unlimited visual-builder forms, up to 200 code-defined forms per workspace, and 200 completed responses a month at launch, with Fillo branding visible on rendered forms. Current allowances and paid limits are published at /pricing and, as Markdown, at /pricing.md.
Related
- Build in the dashboard: Create, publish, and share a form — no code required.
- Quickstart: Install a native renderer in React or another browser framework.
- Agent setup: Install the skill and wire an agent to your workspace.
- Workspaces and projects: Share billing and teammates while isolating forms and keys by project.