Docker Sandboxes vs Fly.io Sprites

Docker Sandboxes costs $0.07 per vCPU-hour and Fly.io Sprites costs $0.0385 per vCPU-hour. Docker Sandboxes runs microVMs. Fly.io Sprites runs microVMs.

Updated Oct 14, 2026

Docker Sandboxes

Cloud microVM sandboxes for coding agents, run by Docker.

Isolation: MicroVM
Free tier: One-time promotional credit for cloud compute
Max session: Not listed

Visit site Docker Sandboxes profile

Fly.io Sprites

Persistent Linux computers that sleep when idle.

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

Visit site Fly.io Sprites profile

What is different

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

Field

Docker Sandboxes

Fly.io Sprites

vCPU, per hour: Docker Sandboxes: $0.07; Fly.io Sprites: $0.0385
RAM, per GiB-hour: Docker Sandboxes: Included; Fly.io Sprites: $0.021875
Free tier: Docker Sandboxes: One-time promotional credit for cloud compute; Fly.io Sprites: $30 trial credit
Billing: Docker Sandboxes: Bundled machine time; Fly.io Sprites: Active CPU time only
SDKs: Docker Sandboxes: JavaScript / TypeScript; Fly.io Sprites: Python, JavaScript / TypeScript, Go
Integrations: Docker Sandboxes: MCP; Fly.io Sprites: MCP, OpenAI Agents SDK

Full comparison

18 fields, at each provider's list price

Docker Sandboxesdocker.com/products/docker-sandboxesdocker.com

Fly.io Spritesfly.io/pricing

Pricing

vCPU, per hour: Docker Sandboxes: $0.07; Fly.io Sprites: $0.0385
RAM, per GiB-hour: Docker Sandboxes: Included; Fly.io Sprites: $0.021875
Storage: Docker Sandboxes: Not listed; Fly.io Sprites: $0.000683 per GiB-hour
Free tier: Docker Sandboxes: One-time promotional credit for cloud compute; Fly.io Sprites: $30 trial credit
Paid plan from: Docker Sandboxes: Pay as you go; Fly.io Sprites: Pay as you go
Billing: Docker Sandboxes: Bundled machine time; Fly.io Sprites: Active CPU time only

Limits

Max session: Docker Sandboxes: Not listed; Fly.io Sprites: Not listed
Idle stop: Docker Sandboxes: Not listed; Fly.io Sprites: Not listed
Largest sandbox: Docker Sandboxes: 16 vCPU · 32 GiB; Fly.io Sprites: Not listed
Concurrent sandboxes: Docker Sandboxes: Up to 10; Fly.io Sprites: Not listed

Platform

Isolation: Docker Sandboxes: MicroVM; Fly.io Sprites: MicroVM
GPU: Docker Sandboxes: Not listed; Fly.io Sprites: Not listed
Snapshots: Docker Sandboxes:; Fly.io Sprites:
Pause and resume: Docker Sandboxes:; Fly.io Sprites:

Developer

SDKs: Docker Sandboxes: JavaScript / TypeScript; Fly.io Sprites: Python, JavaScript / TypeScript, Go
Integrations: Docker Sandboxes: MCP; Fly.io Sprites: MCP, OpenAI Agents SDK

Trust

License: Docker Sandboxes: Not listed; Fly.io Sprites: Not listed
BYOC: Docker Sandboxes: Not listed; Fly.io Sprites: Not listed

Hourly cost

One sandbox running for one hour

Size

Docker Sandboxes

Fly.io Sprites

1 vCPU · 2 GiB: Docker Sandboxes: $0.070; Fly.io Sprites: $0.082
2 vCPU · 4 GiB: Docker Sandboxes: $0.140; Fly.io Sprites: $0.165
4 vCPU · 8 GiB: Docker Sandboxes: $0.280; Fly.io Sprites: $0.329

Compute only, at list rates.

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Which one fits

Based on the fields above

Docker Sandboxes fits when

You want the lower list price: $0.140 against $0.165 an hour for 2 vCPU and 4 GiB.

Fly.io Sprites fits when

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

More comparisons

See all comparisons

Docker Sandboxes

Fly.io Sprites

What is different

Full comparison

Pricing

Limits

Platform

Developer

Trust

Hourly cost

Which one fits

Docker Sandboxes fits when

Fly.io Sprites fits when

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