# Alchemer vs Fillout

> Fillout scores 52.2 (D) on agent readiness against Alchemer's 41.4 (E), and leads in 5 of 7 scored categories. Alchemer leads on security & auth. Both do forms responses. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/alchemer-vs-fillout
- Markdown: https://www.anchorterminal.com/compare/alchemer-vs-fillout.md (~2,150 tokens)
- Slim: https://www.anchorterminal.com/compare/alchemer-vs-fillout.min.md (~630 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/alchemer-vs-fillout.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: 2026-10-09

Fillout scores 52.2 (D) on agent readiness against Alchemer's 41.4 (E), and leads in 5 of 7 scored categories. Alchemer leads on security & auth. Both do forms responses.

- Alchemer: grade E, 41.4/100, rank #798 of 842. Markdown https://www.anchorterminal.com/tools/alchemer.md · JSON https://www.anchorterminal.com/api/v1/tools/alchemer.json
- Fillout: grade D, 52.2/100, rank #656 of 842. Markdown https://www.anchorterminal.com/tools/fillout.md · JSON https://www.anchorterminal.com/api/v1/tools/fillout.json

## Which one, for what

### Alchemer (E)

Good for: A company already on an Alchemer Business Platform contract that wants an agent to build surveys, load contacts, send campaigns and export responses.

Ahead on:
- Security & auth, 44 against 37

Watch for: The pricing page says API access is for Business Platform accounts only, which are quoted by sales

### 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
- Schema & documentation, 63 against 45
- Payments & pricing, 30 against 20
- Transparency & trust, 69 against 61

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


## Score by category

| Category | Weight | Alchemer | Fillout | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 35 | 70 | Fillout +35 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 45 | 63 | Fillout +18 |
| Agent ergonomics | 13% (16.2 this run) | 47 | 47 | even |
| Security & auth | 14% (17.5 this run) | 44 | 37 | Alchemer +7 |
| Payments & pricing | 10% (12.5 this run) | 20 | 30 | Fillout +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 45 | 46 | Fillout +1 |
| Transparency & trust | 7% (8.8 this run) | 61 | 69 | Fillout +8 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **41.4 · E** | **52.2 · D** | |

## Facts side by side

| Fact | Alchemer | Fillout |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Alchemer LLC | Restly, Inc. (trading as Zite) |
| Hosted endpoint | `https://api.alchemer.com/v5` | `https://api.fillout.com/v1/api` |
| Transports | HTTP | HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Paid | Freemium |
| Price for forms responses | not published | $15 per month (plan) |
| x402 | no | no |
| Licence | Proprietary service under the Alchemer Software as a Service Agreement | Proprietary service under Fillout's terms of service. The TypeScript API client on GitHub is MIT |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-01 | none |
| Terms last updated | 2026-01-14 | 2022-07-02 |
| Privacy policy last updated | 2026-04-23 | 2025-10-07 |
| Customer content may train models | yes | not found in the text |
| 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 | not found in the text | yes |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | none | 1.8k npm/wk |

## Verdicts

**Alchemer.** Alchemer's REST API v5 covers surveys, questions, responses, contacts and email campaigns in 101 documented operations, with a reference rewritten in April 2026. The pricing page limits API access to Business Platform accounts quoted by sales. Keys travel in the URL query string, and no status page, OpenAPI document or SDK was found.

**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.

## Before you call either

### Alchemer

1. Use the host for the account's region (`api.alchemer.com`, `api.alchemer.eu`, `api.alchemer-ca.com` or `api.au.alchemer.com`). The wrong host returns a 401 login failure even with valid keys
2. Create with PUT and update with POST. The API reverses the usual meaning of the two methods
3. Do not repeat an identical request inside 60 seconds. GET results are cached for 60 seconds and a repeat can return 429
4. Stay under 240 requests a minute for the account and slow down when the `X-SG-Warning` header appears
5. Wait up to five minutes before reading back a response that was just submitted, and expect a 500 after a 30 second timeout

### 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

## Questions

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

Fillout scores 52.2 (D) on agent readiness against Alchemer's 41.4 (E), and leads in 5 of 7 scored categories. Alchemer leads on security & auth.

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

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

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

Yes. Alchemer has a hosted endpoint at https://api.alchemer.com/v5 and Fillout at https://api.fillout.com/v1/api.


## For agents

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

## Other comparisons with Alchemer or Fillout

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