Mosaic Sandbox vs Watasu

Mosaic Sandbox costs $0.025 per vCPU-hour. Mosaic Sandbox runs Firecracker microVMs. Watasu limits a session to 24 hours.

Updated Oct 15, 2026

Mosaic Sandbox

Linux microVM sandboxes for coding agents.

Isolation: Firecracker microVM
Free tier: Not listed
Max session: Not listed

Visit site Mosaic Sandbox profile

Watasu

Isolated Linux sandboxes for AI agents, hosted in the EU.

Isolation: Not listed
Free tier: Free Basic plan
Max session: 24 hours

Visit site Watasu profile

What is different

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

Field

Mosaic Sandbox

Watasu

Storage: Mosaic Sandbox: Free; Watasu: Retained disks €0.10 per GiB per month while the sandbox is stopped. Checkpoints and templates €0.03 per GiB per month.
Billing: Mosaic Sandbox: Bundled machine time; Watasu: Per second
Largest sandbox: Mosaic Sandbox: 16 vCPU · 32 GiB; Watasu: 8 vCPU · 8 GiB
Concurrent sandboxes: Mosaic Sandbox: Up to 200; Watasu: Up to 100

Full comparison

18 fields, at each provider's list price

Mosaic Sandboxsandbox.mosaicos.com/pricingsandbox.mosaicos.com

Watasuwatasu.io/pricing

Pricing

vCPU, per hour: Mosaic Sandbox: $0.025; Watasu: Not listed
RAM, per GiB-hour: Mosaic Sandbox: Included; Watasu: Not listed
Storage: Mosaic Sandbox: Free; Watasu: Retained disks €0.10 per GiB per month while the sandbox is stopped. Checkpoints and templates €0.03 per GiB per month.
Free tier: Mosaic Sandbox: Not listed; Watasu: Free Basic plan
Paid plan from: Mosaic Sandbox: Pay as you go; Watasu: Not listed
Billing: Mosaic Sandbox: Bundled machine time; Watasu: Per second

Limits

Max session: Mosaic Sandbox: Not listed; Watasu: 24 hours
Idle stop: Mosaic Sandbox: Not listed; Watasu: Not listed
Largest sandbox: Mosaic Sandbox: 16 vCPU · 32 GiB; Watasu: 8 vCPU · 8 GiB
Concurrent sandboxes: Mosaic Sandbox: Up to 200; Watasu: Up to 100

Platform

Isolation: Mosaic Sandbox: Firecracker microVM; Watasu: Not listed
GPU: Mosaic Sandbox: No; Watasu: Not listed
Snapshots: Mosaic Sandbox:; Watasu:
Pause and resume: Mosaic Sandbox:; Watasu:

Developer

SDKs: Mosaic Sandbox: Python, TypeScript, Go; Watasu: Not listed
Integrations: Mosaic Sandbox: LangChain, MCP, Claude Code, Vercel AI SDK; Watasu: Not listed

Trust

License: Mosaic Sandbox: Not listed; Watasu: Not listed
BYOC: Mosaic Sandbox: Not listed; Watasu: Not listed

Hourly cost

One sandbox running for one hour

Size

Mosaic Sandbox

Watasu

1 vCPU · 2 GiB: Mosaic Sandbox: $0.025; Watasu: Not listed
2 vCPU · 4 GiB: Mosaic Sandbox: $0.050; Watasu: Not listed
4 vCPU · 8 GiB: Mosaic Sandbox: $0.100; Watasu: Not listed

Compute only, at list rates.

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Which one fits

Based on the fields above

Mosaic Sandbox fits when

You use LangChain, MCP, Claude Code or the Vercel AI SDK.
You need a sandbox larger than 8 vCPU · 8 GiB.

More comparisons

See all comparisons

Mosaic Sandbox

Watasu

What is different

Full comparison

Pricing

Limits

Platform

Developer

Trust

Hourly cost

Which one fits

Mosaic Sandbox fits when

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