Cloudflare Sandbox vs Mosaic Sandbox

Cloudflare Sandbox costs $0.072 per vCPU-hour and Mosaic Sandbox costs $0.025 per vCPU-hour. Cloudflare Sandbox runs Firecracker microVMs. Mosaic Sandbox runs Firecracker microVMs.

Updated

Cloudflare Sandbox

Isolation
Firecracker microVM
Free tier
None
Max session
Not listed

Mosaic Sandbox

Isolation
Firecracker microVM
Free tier
Not listed
Max session
Not listed

What is different

7 fields differ. The rest are the same or not listed.

Cloudflare Sandbox
Mosaic Sandbox
vCPU, per hour
Cloudflare Sandbox: $0.072
Mosaic Sandbox: $0.025
RAM, per GiB-hour
Cloudflare Sandbox: $0.009
Mosaic Sandbox: Included
Storage
Cloudflare Sandbox: $0.000252 per GiB-hour
Mosaic Sandbox: Free
Paid plan from
Cloudflare Sandbox: $5 / month
Mosaic Sandbox: Pay as you go
Billing
Cloudflare Sandbox: Active CPU time only
Mosaic Sandbox: Bundled machine time
Largest sandbox
Cloudflare Sandbox: 4 vCPU · 12 GiB
Mosaic Sandbox: 16 vCPU · 32 GiB
SDKs
Cloudflare Sandbox: TypeScript
Mosaic Sandbox: Python, TypeScript, Go

Full comparison

18 fields, at each provider's list price

Pricing

vCPU, per hour
Cloudflare Sandbox: $0.072
Mosaic Sandbox: $0.025
RAM, per GiB-hour
Cloudflare Sandbox: $0.009
Mosaic Sandbox: Included
Storage
Cloudflare Sandbox: $0.000252 per GiB-hour
Mosaic Sandbox: Free
Free tier
Cloudflare Sandbox: None
Mosaic Sandbox: Not listed
Paid plan from
Cloudflare Sandbox: $5 / month
Mosaic Sandbox: Pay as you go
Billing
Cloudflare Sandbox: Active CPU time only
Mosaic Sandbox: Bundled machine time

Limits

Max session
Cloudflare Sandbox: Not listed
Mosaic Sandbox: Not listed
Idle stop
Cloudflare Sandbox: Not listed
Mosaic Sandbox: Not listed
Largest sandbox
Cloudflare Sandbox: 4 vCPU · 12 GiB
Mosaic Sandbox: 16 vCPU · 32 GiB
Concurrent sandboxes
Cloudflare Sandbox: Not listed
Mosaic Sandbox: Up to 200

Platform

Isolation
Cloudflare Sandbox: Firecracker microVM
Mosaic Sandbox: Firecracker microVM
GPU
Cloudflare Sandbox: Not listed
Mosaic Sandbox: Not listed
Snapshots
Cloudflare Sandbox:
Mosaic Sandbox:
Pause and resume
Cloudflare Sandbox: Not listed
Mosaic Sandbox:

Developer

SDKs
Cloudflare Sandbox: TypeScript
Mosaic Sandbox: Python, TypeScript, Go
Integrations
Cloudflare Sandbox: Not listed
Mosaic Sandbox: LangChain, MCP

Trust

License
Cloudflare Sandbox: Not listed
Mosaic Sandbox: Not listed
BYOC
Cloudflare Sandbox: Not listed
Mosaic Sandbox: Not listed

Hourly cost

One sandbox running for one hour

Cloudflare Sandbox
Mosaic Sandbox
1 vCPU · 2 GiB
Cloudflare Sandbox: $0.090
Mosaic Sandbox: $0.025
2 vCPU · 4 GiB
Cloudflare Sandbox: $0.180
Mosaic Sandbox: $0.050
4 vCPU · 8 GiB
Cloudflare Sandbox: $0.360
Mosaic Sandbox: $0.100

Compute only, at list rates.

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Which one fits

Based on the fields above

Cloudflare Sandbox fits when

  • Your code waits a lot: CPU is billed only while it is in use.

Mosaic Sandbox fits when

  • You want to pay only for usage, with no plan fee.
  • You use LangChain or MCP.
  • You want the lower list price: $0.050 against $0.180 an hour for 2 vCPU and 4 GiB.
  • You need pause and resume.

More comparisons

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