# Agent 37 Cloud vs Freestyle

> Freestyle scores 58.5 (C) on agent readiness against Agent 37 Cloud's 46.1 (D), and leads in 6 of 7 scored categories. Agent 37 Cloud leads on transparency & trust. Both do sandbox persist. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/agent37-vs-freestyle
- Markdown: https://www.anchorterminal.com/compare/agent37-vs-freestyle.md (~2,500 tokens)
- Slim: https://www.anchorterminal.com/compare/agent37-vs-freestyle.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/agent37-vs-freestyle.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

Freestyle scores 58.5 (C) on agent readiness against Agent 37 Cloud's 46.1 (D), and leads in 6 of 7 scored categories. Agent 37 Cloud leads on transparency & trust. Both do sandbox persist.

- Agent 37 Cloud: grade D, 46.1/100, rank #759 of 842. Markdown https://www.anchorterminal.com/tools/agent37.md · JSON https://www.anchorterminal.com/api/v1/tools/agent37.json
- Freestyle: grade C, 58.5/100, rank #520 of 842. Markdown https://www.anchorterminal.com/tools/freestyle.md · JSON https://www.anchorterminal.com/api/v1/tools/freestyle.json

## Which one, for what

### Agent 37 Cloud (D)

Good for: A product that gives each end user a long-lived agent machine that is idle most of the day and needs a harness preinstalled.

Ahead on:
- Transparency & trust, 56 against 41

Watch for: No status page was found. status.agent37.com returns 404, and the terms promise no uptime level

### Freestyle (C)

Good for: Suited to long-running agent work that needs a full Linux VM, memory-preserving pause, snapshots to branch from and private networking.

Ahead on:
- Reliability, 43 against 27
- Schema & documentation, 86 against 57
- Agent ergonomics, 69 against 60
- Payments & pricing, 45 against 20
- Maintenance & community, 71 against 65

Also in its favour:
- Free to start without a card

Watch for: No terms of service or service agreement found on the site, and the privacy policy covers the website only


## Score by category

| Category | Weight | Agent 37 Cloud | Freestyle | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 27 | 43 | Freestyle +16 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 57 | 86 | Freestyle +29 |
| Agent ergonomics | 13% (16.2 this run) | 60 | 69 | Freestyle +9 |
| Security & auth | 14% (17.5 this run) | 49 | 53 | Freestyle +4 |
| Payments & pricing | 10% (12.5 this run) | 20 | 45 | Freestyle +25 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 65 | 71 | Freestyle +6 |
| Transparency & trust | 7% (8.8 this run) | 56 | 41 | Agent 37 Cloud +15 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **46.1 · D** | **58.5 · C** | |

## Facts side by side

| Fact | Agent 37 Cloud | Freestyle |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Agent 37 Inc. | Freestyle Cloud Inc. |
| Hosted endpoint | `https://api.agent37.com/v1` | `https://api.freestyle.sh/v5` |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Freemium |
| x402 | no | no |
| Licence | Proprietary service under Agent 37's terms of service. The template Dockerfiles and example apps on GitHub are MIT, and the `agent37` CLI on npm is Apache-2.0 | Proprietary service with no published terms of service found. The `freestyle` SDK and CLI package on npm is MIT |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-05 | 2026-09-27 |
| Terms last updated | 2026-08-04 | no document linked |
| Privacy policy last updated | 2026-09-01 | no document linked |
| Customer content may train models | not found in the text |  |
| Terms restrict automated access | not found in the text |  |
| Terms restrict benchmarking | not found in the text |  |
| Terms or service can change without notice | not found in the text |  |
| Arbitration or class-action waiver | not found in the text |  |
| Popularity | 74 npm/wk | 72k npm/wk |

## Verdicts

**Agent 37 Cloud.** Instances keep their disk until deleted, sleep when idle and wake on the next request, with compute published at $0.80 a vCPU-month and stable error codes on both APIs. The product launched on 29 September 2026. No status page, OpenAPI file, SDK library or published rate limits were found, and the starter credit needs a card.

**Freestyle.** A public OpenAPI 3.1 file describes 88 operations with a stable error code on every failure, and per-VM identity tokens keep the team API key away from end users. No terms of service, product privacy policy, request rate limit or incident history was found, and the only SDK is TypeScript.

## Before you call either

### Agent 37 Cloud

1. Send the key as `Authorization: Bearer` to api.agent37.com and as `X-Agent37-Key` to the instance URL. The Bearer form on instance URLs is deprecated
2. Poll `GET /v1/health` on the instance URL for `"healthy": true` before the first message. `status: running` only means the machine is up
3. Check whether `error` is a string before reading `error.code`. Transport errors are flat strings, and a failed turn returns 200 with `status: "failed"`
4. Don't blindly retry an exec that timed out after 13 minutes. The command keeps running, so a retry starts a second copy
5. Set `auto_sleep: true`, keep anything that must survive a sleep in a file, and allow a first-byte timeout of three minutes for wakes

### Freestyle

1. Send a `firewall` object on every `POST /v5/vms`. It is required, and a VM with no rules has no outbound internet
2. Ask the owner to run `freestyle login` in a browser once, then mint a key with `freestyle tokens create --output json`
3. Do not retry an exec that answers 409 `VM_NON_RESPONSIVE`. The command may already have run
4. Keep `exec-await` under its 300,000 ms cap and use a PTY session or `x-freestyle-background-after-secs` for longer work
5. Call the `/v5` paths. The unversioned duplicates in the OpenAPI file are marked deprecated

## Questions

### Which is better for AI agents, Agent 37 Cloud or Freestyle?

Freestyle scores 58.5 (C) on agent readiness against Agent 37 Cloud's 46.1 (D), and leads in 6 of 7 scored categories. Agent 37 Cloud leads on transparency & trust.

### Do Agent 37 Cloud and Freestyle need an API key?

Both need an API key.

### Can an agent call Agent 37 Cloud and Freestyle without installing anything?

Yes. Agent 37 Cloud has a hosted endpoint at https://api.agent37.com/v1 and Freestyle at https://api.freestyle.sh/v5.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/agent37-vs-freestyle.json, and with the fewest tokens: https://www.anchorterminal.com/compare/agent37-vs-freestyle.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "agent37", "b": "freestyle"}`. From a terminal: `anchor compare agent37 freestyle`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/agent37.json and https://www.anchorterminal.com/api/v1/tools/freestyle.json

## Other comparisons with Agent 37 Cloud or Freestyle

- [Agent 37 Cloud vs Amazon Bedrock AgentCore Code Interpreter](https://www.anchorterminal.com/compare/agent37-vs-agentcore-code-interpreter.md)
- [Amazon Bedrock AgentCore Code Interpreter vs Freestyle](https://www.anchorterminal.com/compare/agentcore-code-interpreter-vs-freestyle.md)
- [Blaxel Sandboxes vs Freestyle](https://www.anchorterminal.com/compare/blaxel-sandboxes-vs-freestyle.md)
- [Cloudflare Sandbox SDK vs Freestyle](https://www.anchorterminal.com/compare/cloudflare-sandbox-sdk-vs-freestyle.md)
- [Daytona vs Freestyle](https://www.anchorterminal.com/compare/daytona-vs-freestyle.md)
- [Deno Sandbox vs Freestyle](https://www.anchorterminal.com/compare/deno-sandbox-vs-freestyle.md)
- [E2B vs Freestyle](https://www.anchorterminal.com/compare/e2b-vs-freestyle.md)
- [Freestyle vs Microsoft Execution Containers](https://www.anchorterminal.com/compare/freestyle-vs-microsoft-execution-containers.md)
- [Freestyle vs Modal Sandboxes](https://www.anchorterminal.com/compare/freestyle-vs-modal-sandboxes.md)
- [Freestyle vs Morph Cloud](https://www.anchorterminal.com/compare/freestyle-vs-morph-cloud.md)
- [Freestyle vs Runloop Devboxes](https://www.anchorterminal.com/compare/freestyle-vs-runloop.md)
- [Freestyle vs Sprites](https://www.anchorterminal.com/compare/freestyle-vs-sprites.md)
- [Freestyle vs Together Code Sandbox](https://www.anchorterminal.com/compare/freestyle-vs-together-code-sandbox.md)
- [Freestyle vs Vercel Sandbox](https://www.anchorterminal.com/compare/freestyle-vs-vercel-sandbox.md)
- [Agent 37 Cloud vs Blaxel Sandboxes](https://www.anchorterminal.com/compare/agent37-vs-blaxel-sandboxes.md)
- [Agent 37 Cloud vs Cloudflare Sandbox SDK](https://www.anchorterminal.com/compare/agent37-vs-cloudflare-sandbox-sdk.md)
- [Agent 37 Cloud vs Daytona](https://www.anchorterminal.com/compare/agent37-vs-daytona.md)
- [Agent 37 Cloud vs Deno Sandbox](https://www.anchorterminal.com/compare/agent37-vs-deno-sandbox.md)
- [Agent 37 Cloud vs E2B](https://www.anchorterminal.com/compare/agent37-vs-e2b.md)
- [Agent 37 Cloud vs Microsoft Execution Containers](https://www.anchorterminal.com/compare/agent37-vs-microsoft-execution-containers.md)
- [Agent 37 Cloud vs Modal Sandboxes](https://www.anchorterminal.com/compare/agent37-vs-modal-sandboxes.md)
- [Agent 37 Cloud vs Morph Cloud](https://www.anchorterminal.com/compare/agent37-vs-morph-cloud.md)
- [Agent 37 Cloud vs Runloop Devboxes](https://www.anchorterminal.com/compare/agent37-vs-runloop.md)
- [Agent 37 Cloud vs Sprites](https://www.anchorterminal.com/compare/agent37-vs-sprites.md)
- [Agent 37 Cloud vs Together Code Sandbox](https://www.anchorterminal.com/compare/agent37-vs-together-code-sandbox.md)
- [Agent 37 Cloud vs Vercel Sandbox](https://www.anchorterminal.com/compare/agent37-vs-vercel-sandbox.md)