CreateOS Sandbox vs Replicas
Pick Replicas if you want to hand tickets from Slack, Linear or GitHub to a coding agent and get a pull request back, without building any orchestration. Pick CreateOS Sandbox if you are building your own agent product and need sandbox primitives: exec, pause, fork and egress rules, billed per vCPU and GiB. They solve different layers, so some teams will use both.
Pricing at a Glance
CreateOS rates verified 17 October 2026. Replicas 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
- Compute
- $0.0362 /vCPU-hr
- Memory
- $0.0116 /GiB-hr
Replicas
Replicas bills per workspace-minute: small (2 vCPU / 8 GB) $0.004/min included and $0.006/min after, large (4 vCPU / 16 GB) $0.008/$0.012, ultra (8 vCPU / 32 GB) $0.016/$0.024; Developer is $50/month and Team from $200/month, each including equal usage, as of 17 October 2026.
Where CreateOS Sandbox Fits Better
What CreateOS Sandbox brings to this matchup, with a plain note on where Replicas has the edge.
Low-level control for your own product: exec, files, pause, resume and fork over REST, CLI or six SDKs. Replicas exposes agent sessions rather than these primitives.
Egress rules by host, IP, CIDR or wildcard, enforced on the host outside the VM, so you decide what agent code can reach.
Fork a paused sandbox into many independent copies; Replicas documents no VM fork.
For security reviews: CreateOS is SOC 2 Type II and ISO 27001 certified, with reports available under NDA. Replicas lists SOC 2 Type I, with Type II in progress (vendor-stated).
Where Replicas is strong
Replicas is a finished workflow rather than raw compute: a ticket from Slack or Linear goes in, Claude Code, Codex, Cursor or Opencode works in its own VM with the repo and tooling set up, and a pull request comes back, with warm pools to cut waiting.
Which to Pick
Pick CreateOS Sandbox if
- You are building an agent product that runs user or model code inside your own app.
- You need to control which hosts sandbox code can reach.
- You want to price by vCPU-hour and GiB-hour rather than by workspace-minute.
Pick Replicas if
- You want tickets turned into pull requests without writing orchestration code.
- Your team works in Slack, Linear, GitHub or GitLab and wants agents triggered there.
- You want to switch between Claude Code, Codex, Cursor and Opencode per task.
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 | Replicas |
|---|---|---|
| Isolation | Firecracker micro-VM with its own guest kernel | Isolated VM per workspace; hypervisor not named |
| Pause and resume | Saves disk, memory and CPU state; vCPU billing stops while paused, memory and storage still bill | Workspaces sleep (files kept, wake on next message); memory preservation not published |
| Fork | Fork a paused sandbox into many independent copies | No VM fork documented; chat forking moves a conversation to another agent |
| 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 | Not published; static egress IP on Team and above |
| Inbound access | Closed by default; opt-in HTTPS URL | Workspace previews via the Replicas Engine; URL and auth details not published |
| Largest size | 8 vCPU / 16 GB on Enterprise; 8 / 8 on Pro, 4 / 4 on Beginner, 1 / 1 on Free | ultra workspace: 8 vCPU, 32 GB |
| Concurrency | 1 / 5 / 20 / 30 by plan (Free to Enterprise); paused sandboxes count | 100 API and automation replicas per organization; manual workspaces not published |
| Billing | Per second: $0.03616363 per vCPU-hour, $0.01159025 per GiB-hour, storage $0.0001584 per GB-hour; no egress fees (50 GiB bandwidth budget per sandbox) | Per workspace-minute from $0.004 (small, included); plans from $50/month |
| SDKs and interfaces | TypeScript, Go, Python, Rust, C#, Java (all but TypeScript pre-1.0), CLI, MCP, REST | REST API with SSE events, CLI, dashboard, iOS app, Slack/Linear/GitHub/GitLab integrations |
Common Questions
Is Replicas a sandbox API?
Not in the usual sense. Replicas exposes replicas, which are coding-agent sessions you create, wake, sleep and archive, rather than low-level exec, fork or egress primitives. CreateOS Sandbox exposes those primitives, so you can build your own agent workflow on top of them.
Which coding agents run on Replicas and on CreateOS?
Replicas runs Claude Code, Codex, Cursor or Opencode for you and returns pull requests. CreateOS's devbox:1 image ships with agent CLIs and Docker installed, and you drive the agent yourself through exec, the CLI or an SDK.
How do Replicas and CreateOS prices compare?
They use different units. Replicas charges per workspace-minute, $0.004 included for a small 2 vCPU / 8 GB workspace, about $0.24 per hour. CreateOS charges per second for vCPU ($0.03616363 per hour) and memory ($0.01159025 per GiB-hour), so you size each sandbox yourself.
What compliance reports does Replicas offer?
Replicas states SOC 2 Type I, with Type II in progress, and offers a DPA and SCIM on Enterprise. CreateOS is SOC 2 Type II and ISO 27001 certified, with reports available under NDA.
Sources
Checked 17 October 2026.
See CreateOS Sandbox for yourself
Book a demo, or explore the Sandbox and its pricing.