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Head to head · Sandbox persist · October 2026 research run

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.

Agent 37 CloudAgent 37 Inc. · HTTP API D46.1/100#758 of 841 FreestyleFreestyle Cloud Inc. · HTTP API C58.5/100#520 of 841

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

CategoryWeight this runAgent 37 CloudFreestyleEdge
Reliability16%202743Freestyle +16
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.25786Freestyle +29
Agent ergonomics13%16.26069Freestyle +9
Security & auth14%17.54953Freestyle +4
Payments & pricing10%12.52045Freestyle +25
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.86571Freestyle +6
Transparency & trust7%8.85641Agent 37 Cloud +15
Negative events≤1500
Total46.1 · D58.5 · C

Facts side by side

FactAgent 37 CloudFreestyle
KindHTTP APIHTTP API
VendorAgent 37 Inc.Freestyle Cloud Inc.
Hosted endpointhttps://api.agent37.com/v1https://api.freestyle.sh/v5
TransportsHTTPHTTP
AuthAPI keyAPI key
PricingPay per useFreemium
x402nono
LicenceProprietary 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-2.0Proprietary service with no published terms of service found. The freestyle SDK and CLI package on npm is MIT
Read-only variant documentednono
llms.txtyesyes
Last release2026-10-052026-09-27
Terms last updated2026-08-04no document linked
Privacy policy last updated2026-09-01no document linked
Customer content may train modelsnot found in the text
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingnot found in the text
Terms or service can change without noticenot found in the text
Arbitration or class-action waivernot found in the text
Popularity74 npm/wk72k 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.

Other comparisons with Agent 37 Cloud or Freestyle

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