CreateOS Sandbox vs Replit
Replit is the right pick for a person who wants an AI agent to build and host an app in one browser tab. CreateOS Sandbox is the right pick for developers whose own agent or backend needs to create isolated machines by API, run code in them and tear them down. One is a product you use; the other is infrastructure you build on.
Pricing at a Glance
CreateOS rates verified 17 October 2026. Replit 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
Replit
Replit Core is $20/month and Pro $100/month with matching usage credit; Autoscale deployments cost $2/month plus $0.60 per million compute units, and Reserved VMs run $15 to $130/month, as of 17 October 2026.
Where CreateOS Sandbox Fits Better
What CreateOS Sandbox brings to this matchup, with a plain note on where Replit has the edge.
A public sandbox API with six SDKs, a CLI, MCP and REST; Replit publishes no sandbox SDK.
Each sandbox is a Firecracker micro-VM today, where Replit uses hardened containers and says a move to microVMs is in progress.
Published egress rules, session rules and plan limits; Replit does not document environment lifetimes or egress controls.
Where Replit is strong
The shortest path from an idea to a hosted app for people who do not want to set up tools. Editor, agent, database and deployment all live in one browser tab.
Which to Pick
Pick CreateOS Sandbox if
- Your own agent needs to spin up machines by API
- You need per-sandbox egress rules
- You want to pause, fork and resume environments from code
Pick Replit if
- You want an agent to build and host an app for you, with no code setup
- You collaborate in a browser IDE
- You want database rollback of up to 28 days (Pro)
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 | Replit |
|---|---|---|
| Built for | API-created sandboxes for agent-written and untrusted code | Building and hosting apps by chatting with Replit Agent; collaborative browser coding |
| Isolation | Firecracker micro-VM with its own guest kernel | Hardened Linux container per project with seccomp-bpf, microVM migration in progress; separate Google Cloud project per customer (vendor-stated) |
| Ephemeral per-run environments | Yes. Create a sandbox per task by API, SDK, CLI or MCP and destroy it after | Not published; workspaces and project files persist |
| Pause and resume | Yes. Saves disk, memory and CPU state; vCPU stops billing while paused, memory and storage still bill | Not published |
| Outbound network | Open with no rules; deny-by-default once any rule exists (host, IP, CIDR, wildcard), enforced on the host outside the VM | Not published |
| 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 by default) | Monthly subscription with usage credits; deployments usage-based or flat monthly |
| Run untrusted code | Yes, the core use case; each sandbox is its own micro-VM | Runs user projects; no public sandbox API published |
Common Questions
Does Replit have an API for creating sandboxes?
Replit does not publish a sandbox SDK; its workflow runs through the browser IDE, the mobile app and Replit Agent. CreateOS Sandbox is API-first: REST, a CLI, an MCP server and SDKs for TypeScript, Go, Python, Rust, C# and Java, all except TypeScript pre-1.0.
What isolation does Replit use for projects?
Replit states that each project runs in its own hardened Linux container with seccomp-bpf policies, that each customer gets a separate Google Cloud project, and that a move to microVMs is in progress. Each CreateOS sandbox already runs in a Firecracker micro-VM with its own guest kernel.
How many agents can run at once on Replit Pro?
Replit Pro allows 10 parallel agents; other environment concurrency limits are not published. CreateOS caps concurrent sandboxes by plan at 1, 5, 20 and 30, and paused sandboxes count toward that cap.
Sources
Checked 17 October 2026.
See CreateOS Sandbox for yourself
Book a demo, or explore the Sandbox and its pricing.