CreateOS Sandbox vs Leap0
Pick Leap0 if you want a security-first Firecracker sandbox with host-side credential injection and are comfortable building on a free public preview. Pick CreateOS Sandbox if you need sandboxes that run past 8 hours, more than 8 GB of RAM or 10 GiB of disk, or an EU region.
Leap0 is in public preview: the service is free for now, and its docs warn of breaking changes and downtime during the preview.
Pricing at a Glance
CreateOS rates verified 17 October 2026. Leap0 pricing as published on 17 October 2026. Rates billed per GB rather than per GiB, or as bundled sizes, are quoted as published rather than converted.
CreateOS Sandbox
Lower compute rate- Compute
- $0.0362 /vCPU-hr
- Memory
- $0.0116 /GiB-hr
Leap0
- Compute
- $0.0504 /vCPU-hr
- Memory
- See below
Leap0 is free during public preview; the rates it says will apply when billing starts are $0.0504 per vCPU-hour and $0.0162 per GB-hour, billed per second, as of 17 October 2026.
Where CreateOS Sandbox Fits Better
What CreateOS Sandbox brings to this matchup, with a plain note on where Leap0 has the edge.
No lifetime cap; Leap0 sandboxes time out at 8 hours at most, 5 minutes by default.
Up to 16 GB RAM and 60 GiB disk on Enterprise, against Leap0's preview ceiling of 8 GB and 10 GiB.
eu and us regions, where Leap0 runs in the US only.
Concurrency caps are published per plan (1, 5, 20, 30); Leap0 does not publish a concurrency limit.
Where Leap0 is strong
Leap0 is a security-first sandbox API: Firecracker with Jailer hardening, a per-sandbox egress firewall with domain and CIDR rules, host-side credential injection so API keys never enter the sandbox, plus memory snapshots and fan-out forks.
Which to Pick
Pick CreateOS Sandbox if
- Agent sessions run longer than 8 hours.
- You need more than 8 GB of memory or 10 GiB of disk.
- You want an EU region and published concurrency limits.
Pick Leap0 if
- You want host-side credential injection so API keys never enter the sandbox.
- Free usage during the preview matters more than an SLA.
- Your jobs fit in 8 vCPU / 8 GB and finish within 8 hours.
Head-to-Head Comparison
Every dimension side by side, checked on 17 October 2026 against each vendor's own docs and pricing pages. "Not published" means we could not find it on the vendor's pages, not that the feature is missing.
| Dimension | CreateOS Sandbox | Leap0 |
|---|---|---|
| Isolation | Firecracker micro-VM with its own guest kernel, root filesystem and network identity | Firecracker microVM with a dedicated Linux 6.1 LTS kernel; VMM launched with the Jailer (chroot, cgroup v2, seccomp) |
| Pause and resume | Saves disk, memory and CPU state; vCPU stops billing while paused, memory and storage still bill | Pause saves memory and disk and auto-resumes on the next request; snapshots capture memory and writable disk |
| Fork | Fork a paused sandbox into many independent copies, each with its own id and IP | Restore one snapshot into many new sandboxes in parallel |
| Outbound network default | Open with no rules; deny-by-default once any host, IP, CIDR or wildcard rule exists, enforced on the host outside the VM | Allow-all when no policy is set; deny-all or custom domain and CIDR allowlists; host-side header injection |
| Inbound access | Closed by default; opt-in public HTTPS URL, plus API-authenticated shell and port tunnels | Invoke URL per sandbox for HTTP, SSE and WebSocket, authenticated with your API key; SSH and VNC |
| Largest size | 8 vCPU / 16 GB on Enterprise (Pro 8 vCPU / 8 GB, Beginner 4 / 4, Free 1 / 1) | 8 vCPU / 8 GB memory / 10 GiB disk (preview limits) |
| Concurrency | Free 1, Beginner 5, Pro 20, Enterprise 30; paused sandboxes count toward the cap | Not published (org quota of 1,000 API requests per 60 s) |
| Session length | No lifetime cap; optional idle auto-pause from 60 s to 24 h, off by default | Timeout 1 minute to 8 hours, default 5 minutes |
| Billing | Per second: $0.03616363/vCPU-hr, $0.01159025/GiB-hr, storage $0.0001584/GB-hr; no egress fees, 50 GiB bandwidth budget per sandbox | Free during preview; future rates $0.0504/vCPU-hr and $0.0162/GB-hr |
| SDKs and interfaces | TypeScript, Go, Python, Rust, C#, Java (all but TypeScript pre-1.0), CLI, MCP, REST | Python and TypeScript SDKs, REST and WebSocket, MCP server, built-in LSP, PTY |
Common Questions
Is Leap0 free to use?
Yes, for now. Leap0 is free during its public preview with no card required, and it lists $0.0504 per vCPU-hour and $0.0162 per GB-hour as the rates that will apply once billing goes live. CreateOS Sandbox bills today at $0.03616363 per vCPU-hour and $0.01159025 per GiB-hour.
How long can a Leap0 sandbox stay up?
At most 8 hours. Leap0 timeouts range from 1 minute to 8 hours, with a 5-minute default. CreateOS Sandbox has no lifetime cap; you can set auto-pause after 60 seconds to 24 hours of inactivity, or leave it off, which is the default.
Do Leap0 and CreateOS handle egress the same way?
Closely. Both allow all outbound traffic when no policy is set and let you lock it down by domain and CIDR. Leap0 adds a deny-all mode and host-side header injection; CreateOS Sandbox switches to deny-by-default as soon as one rule exists and enforces it on the host.
Sources
Checked 17 October 2026.
See CreateOS Sandbox for yourself
Book a demo, or explore the Sandbox and its pricing.