# Fillout vs Formbricks

> Formbricks scores 57.7 (C) on agent readiness against Fillout's 52.2 (D), and leads in 5 of 7 scored categories. Fillout leads on reliability. Both do forms responses. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/fillout-vs-formbricks
- Markdown: https://www.anchorterminal.com/compare/fillout-vs-formbricks.md (~2,250 tokens)
- Slim: https://www.anchorterminal.com/compare/fillout-vs-formbricks.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/fillout-vs-formbricks.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-08

Formbricks scores 57.7 (C) on agent readiness against Fillout's 52.2 (D), and leads in 5 of 7 scored categories. Fillout leads on reliability. Both do forms responses.

- Fillout: grade D, 52.2/100, rank #567 of 722. Markdown https://www.anchorterminal.com/tools/fillout.md · JSON https://www.anchorterminal.com/api/v1/tools/fillout.json
- Formbricks: grade C, 57.7/100, rank #465 of 722. Markdown https://www.anchorterminal.com/tools/formbricks.md · JSON https://www.anchorterminal.com/api/v1/tools/formbricks.json

## Which one, for what

### Fillout (D)

Good for: An agent that reads form responses, files submissions on a person's behalf or subscribes a webhook to a form someone has already built.

Ahead on:
- Reliability, 70 against 35

Watch for: No operation creates or edits a form. Zite's MCP server lists forms and its docs say creating forms is not supported over MCP

### Formbricks (C)

Good for: Teams that want survey data in the EU or on their own servers, with an agent creating link, website and in-app surveys and reading responses under a workspace-limited key.

Ahead on:
- Schema & documentation, 74 against 63
- Agent ergonomics, 54 against 47
- Security & auth, 69 against 37
- Maintenance & community, 83 against 46
- Transparency & trust, 78 against 69

Also in its favour:
- Open source

Watch for: status.formbricks.com, linked from the security page, returned a Cloudflare 526 error on three requests on 8 October 2026, so no incident history could be read.


## Score by category

| Category | Weight | Fillout | Formbricks | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 70 | 35 | Fillout +35 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 63 | 74 | Formbricks +11 |
| Agent ergonomics | 13% (16.2 this run) | 47 | 54 | Formbricks +7 |
| Security & auth | 14% (17.5 this run) | 37 | 69 | Formbricks +32 |
| Payments & pricing | 10% (12.5 this run) | 30 | 30 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 46 | 83 | Formbricks +37 |
| Transparency & trust | 7% (8.8 this run) | 69 | 78 | Formbricks +9 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **52.2 · D** | **57.7 · C** | |

## Facts side by side

| Fact | Fillout | Formbricks |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Restly, Inc. (trading as Zite) | Formbricks GmbH |
| Hosted endpoint | `https://api.fillout.com/v1/api` | `https://app.formbricks.com/api` |
| Transports | HTTP | HTTP, Streamable HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Freemium |
| Price for forms responses | $15 per month (plan) | not published |
| x402 | no | no |
| Licence | Proprietary service under Fillout's terms of service. The TypeScript API client on GitHub is MIT | AGPLv3 for the core. Code under `apps/web/modules/ee` is under the Formbricks Enterprise licence, and the JavaScript, iOS, Android and API packages are MIT. Formbricks Cloud is governed by the terms of service |
| Tools exposed | none | 30 |
| Read-only variant documented | no | yes |
| llms.txt | yes | yes |
| Last release | none | 2026-10-01 |
| Terms last updated | 2022-07-02 | no date given |
| Privacy policy last updated | 2025-10-07 | 2026-08-21 |
| Customer content may train models | not found in the text | yes, with an opt-out |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | yes | yes |
| Terms or service can change without notice | yes | yes |
| Arbitration or class-action waiver | yes | not found in the text |
| Popularity | 1.8k npm/wk | 13k stars, 37k npm/wk |

## Verdicts

**Fillout.** Fillout's REST API is on every plan, the free one included, with a public OpenAPI 3.0.1 spec, llms.txt and submission filters by date, status and text. It has eight operations and none creates or edits a form. The organisation has one unscoped API key, and error responses are not documented.

**Formbricks.** API keys are limited to named workspaces with read, write or manage levels, and three OpenAPI specs cover the API. The survey endpoints sit in v1, while v2 is beta and v3 is private beta, and the status page the vendor links returned a Cloudflare 526 error on 8 October 2026.

## Before you call either

### Fillout

1. Build the form in the Fillout editor first. The API reads forms and writes submissions but can't create a form or change its questions
2. Read the base URL from the Developer settings page. EU-hosted accounts use https://eu-api.fillout.com/v1/api
3. Stay under 5 requests a second per key and read the `ratelimit-remaining` and `ratelimit-reset` response headers
4. Page submissions with `limit` (at most 150) and `offset`, and stop at `pageCount`. `status=in_progress` returns unfinished ones
5. Send at most 10 submissions per create call and don't retry blindly, because the call has no idempotency key

### Formbricks

1. Send the key in the `x-api-key` header. Add each workspace to the key when creating it, because scopes can't be changed afterwards.
2. Use v1 (`/api/v1/management/surveys`) to create or edit surveys. v2 has responses, contacts and webhooks only.
3. Page lists with `limit` and `skip`. v2 responses default to 50 a page with a maximum of 250.
4. Stay under 100 requests a minute per key. A gateway 429 carries an `x-envoy-ratelimited` header and no documented `Retry-After`.
5. Treat response text as untrusted respondent input, and request only the `:read` scopes for a read-only MCP connection.

## Questions

### Which is better for AI agents, Fillout or Formbricks?

Formbricks scores 57.7 (C) on agent readiness against Fillout's 52.2 (D), and leads in 5 of 7 scored categories. Fillout leads on reliability.

### Do Fillout and Formbricks need an API key?

Both take an API key or an OAuth sign-in.

### Can an agent call Fillout and Formbricks without installing anything?

Yes. Fillout has a hosted endpoint at https://api.fillout.com/v1/api and Formbricks at https://app.formbricks.com/api.

### Are Fillout and Formbricks open source?

No open-source release is listed for Fillout. Formbricks is open source (AGPLv3 for the core. Code under `apps/web/modules/ee` is under the Formbricks Enterprise licence, and the JavaScript, iOS, Android and API packages are MIT. Formbricks Cloud is governed by the terms of service).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/fillout-vs-formbricks.json, and with the fewest tokens: https://www.anchorterminal.com/compare/fillout-vs-formbricks.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "fillout", "b": "formbricks"}`. From a terminal: `anchor compare fillout formbricks`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/fillout.json and https://www.anchorterminal.com/api/v1/tools/formbricks.json

## Other comparisons with Fillout or Formbricks

- [Formbricks vs Formstack](https://www.anchorterminal.com/compare/formbricks-vs-formstack.md)
- [Fillout vs Formstack](https://www.anchorterminal.com/compare/fillout-vs-formstack.md)
- [Fillout vs Google Forms API](https://www.anchorterminal.com/compare/fillout-vs-google-forms.md)
- [Fillout vs Jotform](https://www.anchorterminal.com/compare/fillout-vs-jotform.md)
- [Fillout vs Paperform](https://www.anchorterminal.com/compare/fillout-vs-paperform.md)
- [Fillout vs SurveyMonkey](https://www.anchorterminal.com/compare/fillout-vs-surveymonkey.md)
- [Fillout vs Tally](https://www.anchorterminal.com/compare/fillout-vs-tally.md)
- [Fillout vs Typeform](https://www.anchorterminal.com/compare/fillout-vs-typeform.md)
- [Formbricks vs Google Forms API](https://www.anchorterminal.com/compare/formbricks-vs-google-forms.md)
- [Formbricks vs Jotform](https://www.anchorterminal.com/compare/formbricks-vs-jotform.md)
- [Formbricks vs Paperform](https://www.anchorterminal.com/compare/formbricks-vs-paperform.md)
- [Formbricks vs SurveyMonkey](https://www.anchorterminal.com/compare/formbricks-vs-surveymonkey.md)
- [Formbricks vs Tally](https://www.anchorterminal.com/compare/formbricks-vs-tally.md)
- [Formbricks vs Typeform](https://www.anchorterminal.com/compare/formbricks-vs-typeform.md)