Fillo
A developer tool that lets coding agents build forms into apps.
Data verified Sep 26, 2026
Score
Editorial Verdict
AI-researched, not hands-on testedFillo targets a narrow but real pain point: AI coding agents tend to produce inconsistent form code from one prompt to the next, and Fillo exposes form generation as a single, repeatable capability an agent can call instead of reinventing markup and validation each time. It fits developers already building with AI coding agents who want form output that's predictable across a codebase, rather than teams looking for a general form builder or a no-code tool. The main caveat is scope: it does one thing, so its value depends entirely on how well its generated forms match your stack and validation needs, and there's not enough public detail here on framework support, customization, or where the freemium tier's limits kick in to judge that.
Reviewed by AIToolPundit Editorial Team · last verified September 2026
About Fillo
Fillo is a developer tool that lets AI coding agents build forms directly into applications, handling form generation as a discrete, well-defined capability an agent can call rather than having the agent hand-write form markup and validation logic from scratch each time. It is aimed at developers using AI coding agents who want reliable, consistent form-building instead of agent-generated form code that varies in quality each time.
Screenshots
Commonly Cited Strengths & Limitations
Strengths
- Free tier has no time limit and includes the full product (200 responses/month, unlimited visual-builder forms, full SDK)
- Designed to be wired in by a coding agent (a copy-paste build prompt on the homepage), fitting AI-assisted development workflows
- File uploads route to the developer's own storage (Drive/Box/S3/R2) instead of a locked-in vendor silo
Limitations
- Code-defined forms are capped at 200 per workspace even on the paid Everything plan
- Response overage beyond the plan allowance is billed per-response (€0.007-0.008 each), so high-volume forms can get costly
Details
- Pricing Model
- Freemium
- Starting Price
- Free
- Category
- Developer Tools
Frequently Asked Questions
How much does Fillo cost?
Fillo starts at Free (Freemium).
Does Fillo have an API?
Yes, Fillo provides an API for developers.
Is Fillo cloud-based or self-hosted?
Fillo is offered as a cloud-based (SaaS) deployment.
What are the downsides of Fillo?
Code-defined forms are capped at 200 per workspace even on the paid Everything plan Also, Response overage beyond the plan allowance is billed per-response (€0.007-0.008 each), so high-volume forms can get costly
What is the best alternative to Fillo?
Trickle is the closest alternative to Fillo, followed by Supadev and Groq.
How does Fillo compare to Trickle?
Fillo and Trickle are both used for developer tools. See the full side-by-side comparison for pricing and feature differences.
Key Features
- Visual + code-defined formsBuild forms in a visual builder or define them in code with a full SDK: default renderer, custom fields, and headless composition.
- File uploads to your storageHandles form file uploads directly to Google Drive, Box, or S3/R2 rather than storing them in a proprietary silo.
- Conditional logic & prefillSupports conditional logic, answer piping, multi-page forms, URL prefill, hidden fields, and edit-in-place prefill of a respondent's previous answers.
- Drop-off recoverySave-and-resume drafts, in-progress view, resume emails, and a daily digest to recover abandoned form sessions.
- Signed webhooks & integrationsSigned webhooks and CSV export, plus native connections to Google Sheets, Notion, Slack, HubSpot, and Zapier.
- Response identity & verificationCan identify signed-in respondents, with optional server-side verification, and enforce per-browser/contact/person response limits.
Technical Details
- Deployment
- Cloud
- API
- Available
Official Pricing
Fillo's published plans · verified Sep 26, 2026
Free
$0/mo
- 200 responses/month
- Unlimited visual-builder forms, up to 200 code-defined
- Full SDK, file uploads, signed webhooks
- EU-hosted app and responses
Everything
$39/mo/mo
- 5,000 responses/month, then $0.008 per additional response
- Turns off "Powered by Fillo" badge
- Priority email support
- 30-day free trial
Real Pricing from Verified Users
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