Fly.io Sprites vs Sendblue Sandboxes

Fly.io Sprites costs $0.0385 per vCPU-hour and Sendblue Sandboxes costs $0.165 per vCPU-hour. Fly.io Sprites runs Firecracker microVMs. Sendblue Sandboxes runs containers.

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

Sendblue Sandboxes

Isolated cloud Linux machines that AI agents control over an HTTP API.

Isolation: Container
Free tier: $100 free compute, once per phone number
Max session: Not listed

Visit site Sendblue Sandboxes profile

What is different

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

Field

Fly.io Sprites

Sendblue Sandboxes

vCPU, per hour: Fly.io Sprites: $0.0385; Sendblue Sandboxes: $0.165
RAM, per GiB-hour: Fly.io Sprites: $0.021875; Sendblue Sandboxes: Included
Free tier: Fly.io Sprites: $30 trial credit; Sendblue Sandboxes: $100 free compute, once per phone number
Billing: Fly.io Sprites: Active CPU time only; Sendblue Sandboxes: Bundled machine time
Isolation: Fly.io Sprites: Firecracker microVM; Sendblue Sandboxes: Container
Pause and resume: Fly.io Sprites:; Sendblue Sandboxes: No

Full comparison

18 fields, at each provider's list price

Fly.io Spritesfly.io/pricing

Sendblue Sandboxessendblue.com/sandboxessendblue.com

Pricing

vCPU, per hour: Fly.io Sprites: $0.0385; Sendblue Sandboxes: $0.165
RAM, per GiB-hour: Fly.io Sprites: $0.021875; Sendblue Sandboxes: Included
Storage: Fly.io Sprites: $0.000683 per GiB-hour; Sendblue Sandboxes: Not listed
Free tier: Fly.io Sprites: $30 trial credit; Sendblue Sandboxes: $100 free compute, once per phone number
Paid plan from: Fly.io Sprites: Pay as you go; Sendblue Sandboxes: Not listed
Billing: Fly.io Sprites: Active CPU time only; Sendblue Sandboxes: Bundled machine time

Limits

Max session: Fly.io Sprites: Not listed; Sendblue Sandboxes: Not listed
Idle stop: Fly.io Sprites: Not listed; Sendblue Sandboxes: After 10 minutes
Largest sandbox: Fly.io Sprites: Not listed; Sendblue Sandboxes: 2 vCPU · 8 GiB
Concurrent sandboxes: Fly.io Sprites: Not listed; Sendblue Sandboxes: Up to 5

Platform

Isolation: Fly.io Sprites: Firecracker microVM; Sendblue Sandboxes: Container
GPU: Fly.io Sprites: Not listed; Sendblue Sandboxes: Not listed
Snapshots: Fly.io Sprites:; Sendblue Sandboxes: Not listed
Pause and resume: Fly.io Sprites:; Sendblue Sandboxes: No

Developer

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

Trust

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

Hourly cost

One sandbox running for one hour

Size

Fly.io Sprites

Sendblue Sandboxes

1 vCPU · 2 GiB: Fly.io Sprites: $0.082; Sendblue Sandboxes: $0.165
2 vCPU · 4 GiB: Fly.io Sprites: $0.165; Sendblue Sandboxes: $0.330
4 vCPU · 8 GiB: Fly.io Sprites: $0.329; Sendblue Sandboxes: $0.660

Compute only, at list rates.

Open the calculator

Which one fits

Based on the fields above

Fly.io Sprites fits when

You want each sandbox in its own microVM.
You use MCP, the OpenAI Agents SDK or Claude Code.
You want the lower list price: $0.165 against $0.330 an hour for 2 vCPU and 4 GiB.
You need snapshots.

Sendblue Sandboxes fits when

You want the larger free credit: $100 against $30.

More comparisons

See all comparisons

Fly.io Sprites

Sendblue Sandboxes

What is different

Full comparison

Pricing

Limits

Platform

Developer

Trust

Hourly cost

Which one fits

Fly.io Sprites fits when

Sendblue Sandboxes fits when

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