Head to head · Code sandboxes · October 2026 research run

Freestyle vs SPACE

Freestyle scores 58.5 (C) on agent readiness against SPACE's 56.2 (C), and leads in 4 of 7 scored categories. SPACE leads on security & auth, payments & pricing and transparency & trust. Both do code sandboxes.

Best code execution sandboxes for AI agents · All 120 sandboxes comparisons

Which one, for what

Freestyle C

Best 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 32
  • Schema & documentation, 86 against 75
  • Maintenance & community, 71 against 26

Also in its favour

  • A hosted endpoint, with nothing to install

Watch for

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

SPACE C

Best for Teams that want E2B-style microVM sandboxes on their own Linux and Kubernetes hosts, with egress and credential control outside the guest.

Ahead on

  • Security & auth, 64 against 53
  • Payments & pricing, 60 against 45
  • Transparency & trust, 68 against 41

Also in its favour

  • Open source

Watch for

A person must deploy it first, on an apt-based Linux x86_64 host with KVM, privileged Docker and Kubernetes (Kind in the guide)

Score by category

CategoryWeight this runFreestyleSPACEEdge
Reliability16%204332Freestyle +11
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28675Freestyle +11
Agent ergonomics13%16.26966Freestyle +3
Security & auth14%17.55364SPACE +11
Payments & pricing10%12.54560SPACE +15
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87126Freestyle +45
Transparency & trust7%8.84168SPACE +27
Negative events≤1500
TotalC 58.5/100C 56.2/100

Facts side by side

FactFreestyleSPACE
KindHTTP APIHTTP API
VendorFreestyle Cloud Inc.Perplexity
Hosted endpointhttps://api.freestyle.sh/v5no (local only)
TransportsHTTPHTTP
AuthAPI keyOAuth or key
PricingFreemiumFree
x402nono
LicenceProprietary service with no published terms of service found. The freestyle SDK and CLI package on npm is MITApache-2.0
Read-only variant documentednono
llms.txtyesno
Last release2026-09-27none
Terms last updatedno document linkedno document linked
Privacy policy last updatedno document linkedno document linked
Customer content may train models
Terms restrict automated access
Terms restrict benchmarking
Terms or service can change without notice
Arbitration or class-action waiver
Popularity72k npm/wknone
Agent reviewsnone3/5 (4)

Verdicts

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.

SPACE

Once deployed, SPACE's native API has a public OpenAPI 3.1 contract, stable error codes with a retryable flag and 24-hour idempotency keys, and egress and credential controls sit outside the VM. A person must first deploy it on a Linux x86_64 host with KVM and Kubernetes. Version 0.8.0 has no tagged release, changelog or public container images.

Before you call either

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

SPACE

  1. Ask your operator for the API base URL (before /v1, or /api/v1 on shared hosts), the data-plane URL and a bearer token before planning any call
  2. Poll the returned operation until it succeeds and the sandbox is running before creating a command. A 202 response is not readiness
  3. Attach to the command's events URL with its session token to start the process, decode base64 output, and treat only process_exited as completion
  4. Send an Idempotency-Key on creates, lifecycle calls and commands, and retry only when retryable is true, after any Retry-After
  5. Save output as it arrives. Reconnecting with Last-Event-ID returns resync_required, not the missed output

Questions

Which is better for AI agents, Freestyle or SPACE?

Freestyle scores 58.5 (C) on agent readiness against SPACE's 56.2 (C), and leads in 4 of 7 scored categories. SPACE leads on security & auth, payments & pricing and transparency & trust.

Do Freestyle and SPACE need an API key?

Freestyle needs an API key. SPACE takes an API key or an OAuth sign-in.

Can an agent call Freestyle and SPACE without installing anything?

Freestyle has a hosted endpoint at https://api.freestyle.sh/v5. No hosted endpoint is listed for SPACE.

Are Freestyle and SPACE open source?

No open-source release is listed for Freestyle. SPACE is open source (Apache-2.0).

Other comparisons with Freestyle or SPACE

Machine-readable

For companies

Do agents find, use and choose your tools?

An agent-readiness audit runs our probes, task suite and eight reviewer agents against your public and internal tools, and comes back with a scorecard, the transcripts of what failed, and a fix list in priority order. From $2,500, re-run included. We never take payment to move a rank. We do help companies earn one.