Fly.io Sprites vs Watasu

Fly.io Sprites costs $0.0385 per vCPU-hour. Fly.io Sprites runs Firecracker microVMs. Watasu limits a session to 24 hours.

Updated Oct 15, 2026

Fly.io Sprites

Persistent Linux computers that sleep when idle.

Isolation: Firecracker microVM
Free tier: $30 trial credit
Max session: Not listed

Visit site Fly.io Sprites 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

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

Field

Fly.io Sprites

Watasu

Storage: Fly.io Sprites: $0.000683 per GiB-hour; 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: Fly.io Sprites: $30 trial credit; Watasu: Free Basic plan
Billing: Fly.io Sprites: Active CPU time only; Watasu: Per second

Full comparison

18 fields, at each provider's list price

Fly.io Spritesfly.io/pricing

Watasuwatasu.io/pricing

Pricing

vCPU, per hour: Fly.io Sprites: $0.0385; Watasu: Not listed
RAM, per GiB-hour: Fly.io Sprites: $0.021875; Watasu: Not listed
Storage: Fly.io Sprites: $0.000683 per GiB-hour; 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: Fly.io Sprites: $30 trial credit; Watasu: Free Basic plan
Paid plan from: Fly.io Sprites: Pay as you go; Watasu: Not listed
Billing: Fly.io Sprites: Active CPU time only; Watasu: Per second

Limits

Max session: Fly.io Sprites: Not listed; Watasu: 24 hours
Idle stop: Fly.io Sprites: Not listed; Watasu: Not listed
Largest sandbox: Fly.io Sprites: Not listed; Watasu: 8 vCPU · 8 GiB
Concurrent sandboxes: Fly.io Sprites: Not listed; Watasu: Up to 100

Platform

Isolation: Fly.io Sprites: Firecracker microVM; Watasu: Not listed
GPU: Fly.io Sprites: Not listed; Watasu: Not listed
Snapshots: Fly.io Sprites:; Watasu:
Pause and resume: Fly.io Sprites:; Watasu:

Developer

SDKs: Fly.io Sprites: Python, JavaScript / TypeScript, Go; Watasu: Not listed
Integrations: Fly.io Sprites: MCP, OpenAI Agents SDK, Claude Code; Watasu: Not listed

Trust

License: Fly.io Sprites: Not listed; Watasu: Not listed
BYOC: Fly.io Sprites: Not listed; Watasu: Not listed

Hourly cost

One sandbox running for one hour

Size

Fly.io Sprites

Watasu

1 vCPU · 2 GiB: Fly.io Sprites: $0.082; Watasu: Not listed
2 vCPU · 4 GiB: Fly.io Sprites: $0.165; Watasu: Not listed
4 vCPU · 8 GiB: Fly.io Sprites: $0.329; Watasu: Not listed

Compute only, at list rates.

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Which one fits

Based on the fields above

Fly.io Sprites fits when

You use MCP, the OpenAI Agents SDK or Claude Code.
Your code waits a lot: CPU is billed only while it is in use.

More comparisons

See all comparisons

Fly.io Sprites

Watasu

What is different

Full comparison

Pricing

Limits

Platform

Developer

Trust

Hourly cost

Which one fits

Fly.io Sprites fits when

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