Native in-app forms
Fillo lets you place forms directly inside your product instead of sending users to a separate page. The homepage says your route and components render the form directly, and the rendered form keeps your interface in place.
Fillo
Fillo is a form layer for products and websites that keeps forms inside the app while handling validation, uploads, responses, exports, and delivery. It supports both editor-based and code-defined workflows, with a free tier and a paid plan for higher volume and priority support.
Product overview
Fillo is a form layer for products that need native forms inside an app or website. Rather than building form handling, validation, uploads, response storage, and delivery from scratch, teams can use Fillo to provide those pieces in one system.
The product is aimed at workflows where the form should stay connected to the product experience: onboarding, support, feedback, intake, file requests, approvals, and other cases where route context, user context, and ongoing edits matter. The site also shows both visual-builder and code-defined approaches, so it can fit teams building in the editor or from an application codebase.
What Fillo handles
Editor and code-defined builds
Forms can be built in the editor or in code. The site mentions a React and framework-agnostic DOM renderer, plus support for custom fields and headless composition.
Form logic and respondent context
Supported form behaviors include validation, conditional logic, answer piping, multi-page forms, URL prefill, hidden fields, signed-in respondent identification, and optional server verification.
File uploads to your storage
Uploaded files can go directly to connected storage such as Google Drive, Box, Amazon S3, or Cloudflare R2, with Fillo keeping the response and durable file reference together.
Response handling and delivery
Responses include a grid view, detail view, CSV export, signed webhooks, and delivery into tools such as Google Sheets, Notion, Slack, HubSpot, Zapier, and email notifications.
Versioned response history
Published forms keep their schema history as they change. The site says new versions can change fields while older responses retain their original schema context.
Where Fillo fits
Product onboarding
Use Fillo for onboarding flows that need to live inside the product and carry account or page context without pushing users into a separate form tool.
Support and bug intake
The product is suited to support forms that collect issue details, severity, attachments, and routing information while staying inside the app experience.
Customer feedback collection
Teams can use it for feedback and review forms, including quick ratings, comments, and contextual fields tied to a page or account.
Approvals and internal requests
It can handle approval, access-request, or internal workflow forms where the request needs response history, signed webhooks, and delivery into tools the team already uses.
File requests and uploads
The file-upload flow is designed for requests that involve large or durable uploads, with files stored in connected services such as Drive, Box, S3, or R2.
Pros and Cons
Pros
- Forms render directly in the product, so the interface can stay consistent with the app instead of using an iframe.
- The product covers several form-building needs in one place, including validation, uploads, response handling, webhooks, exports, and version history.
- It supports both editor-based and code-defined workflows, which makes it usable for different development styles.
- Uploaded files can be sent to external storage you control, rather than being locked inside Fillo.
- The pricing page shows a free tier with no time limit and a paid plan that adds higher response limits and priority support.
Cons
- Some capabilities are described on the homepage or pricing page only, so a few details are still partial from the available source material.
- Advanced workflow and integration coverage is broad in the published text, but the site excerpts do not fully document every supported destination or setup constraint.
FAQ
Is the free plan really free?
Yes. The Free plan is €0 with no time limit and no card required. It includes unlimited visual-builder forms, up to 200 code-defined forms per workspace, and 200 completed responses per month.
What counts as a response?
One completed submission to one of your forms counts as a response. Building, previewing, and partial entries do not count.
What happens if I go over the response limit?
Free includes 200 completed responses per month. Everything includes 5,000. Above that, additional responses are billed at €0.007 or $0.008 each, depending on currency, and the forms keep collecting.
Can I get my data out?
Yes. Export to CSV is available on every plan, and the form setup and responses remain yours.
Where is Fillo hosted and where do files go?
Fillo runs on EU servers, and form responses are stored there. Uploaded files go to the storage you connect, such as Google Drive, Box, or an S3-compatible bucket.
Quick Facts
- Category
- Developer Tool
- Primary use
- Native forms inside products and websites
- Platform fit
- React, Vue, Svelte, Astro, and plain browser apps
- Notable workflow
- Build in the editor or from code, then publish changes while keeping old response context
- Hosting
- EU-hosted app and responses
- Pricing
- Free tier plus paid plan; free is no-time-limit and no-card-required
Alternativas a Fillo
ByteAsk
ByteAsk is a terminal-first AI coding agent for C and C++ that edits repositories and verifies changes with the real compiler, debugger, sanitizers, and tests before showing a diff. It offers a free tier plus paid plans, with editor connectors and zero-retention handling described in the source.
CreateOS Sandbox
CreateOS Sandbox is an isolated compute environment for running code and agent workloads inside Firecracker micro-VMs. It is designed for workflows that need machine-level isolation, private networking between sandboxes, and programmatic control through SDK, CLI, or MCP.
hob
hob is an independent workspace for coding agents that keeps agent sessions, terminals, history, and follow-up work organized around the tools and providers you already use. It is aimed at developers who want local control over routing, history, and workspace structure rather than a bundled model stack.
Ably Chat
Ably Chat is a chat API platform for building custom realtime chat applications. It supports room-based messaging, typing indicators, presence, reactions, and message updates, with usage-based pricing options for different deployment stages.
Make Real
Make Real is a Next.js app that turns hand-drawn wireframes into working HTML prototypes using the tldraw SDK and AI models. It helps users sketch on a canvas, generate code, and review the result in an embedded preview.
Manta AI
Manta AI is an autonomous web app testing tool for teams that want to map application behavior, catch regressions, and generate tests without writing scripts or maintaining selectors. It works from a URL and supports plain-English test flows, run results with screenshots, and scheduled or deployment-triggered checks.