Sendblue Sandboxes vs Zipbox

Sendblue Sandboxes costs $0.165 per vCPU-hour and Zipbox costs $0.00685 per vCPU-hour. Sendblue Sandboxes runs containers. Zipbox runs Firecracker microVMs and has no session limit.

Updated Oct 23, 2026

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

Zipbox

Long-lived Firecracker microVMs for AI agents, each with its own desktop.

Isolation: Firecracker microVM
Free tier: $25 credit after a one-time $5 top-up
Max session: No limit

Visit site Zipbox profile

What is different

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

Field

Sendblue Sandboxes

Zipbox

vCPU, per hour: Sendblue Sandboxes: $0.165; Zipbox: $0.00685
Free tier: Sendblue Sandboxes: $100 free compute, once per phone number; Zipbox: $25 credit after a one-time $5 top-up
Largest sandbox: Sendblue Sandboxes: 2 vCPU · 8 GiB; Zipbox: 6 vCPU · 16 GiB
Isolation: Sendblue Sandboxes: Container; Zipbox: Firecracker microVM

Full comparison

18 fields, at each provider's list price

Sendblue Sandboxessendblue.com/sandboxessendblue.com

Zipboxzipbox.ai/pricing

Pricing

vCPU, per hour: Sendblue Sandboxes: $0.165; Zipbox: $0.00685
RAM, per GiB-hour: Sendblue Sandboxes: Included; Zipbox: Included
Storage: Sendblue Sandboxes: Not listed; Zipbox: Free
Free tier: Sendblue Sandboxes: $100 free compute, once per phone number; Zipbox: $25 credit after a one-time $5 top-up
Paid plan from: Sendblue Sandboxes: Not listed; Zipbox: Pay as you go
Billing: Sendblue Sandboxes: Bundled machine time; Zipbox: Bundled machine time

Limits

Max session: Sendblue Sandboxes: Not listed; Zipbox: No limit
Idle stop: Sendblue Sandboxes: After 10 minutes; Zipbox: Not listed
Largest sandbox: Sendblue Sandboxes: 2 vCPU · 8 GiB; Zipbox: 6 vCPU · 16 GiB
Concurrent sandboxes: Sendblue Sandboxes: Up to 5; Zipbox: Not listed

Platform

Isolation: Sendblue Sandboxes: Container; Zipbox: Firecracker microVM
GPU: Sendblue Sandboxes: Not listed; Zipbox: Not listed
Snapshots: Sendblue Sandboxes: Not listed; Zipbox: No
Pause and resume: Sendblue Sandboxes: No; Zipbox: No

Developer

SDKs: Sendblue Sandboxes: Not listed; Zipbox: TypeScript, Python, Go, Rust
Integrations: Sendblue Sandboxes: Not listed; Zipbox: MCP, Claude Code, Claude Agent SDK, OpenAI Agents SDK, Vercel AI SDK, LangChain

Trust

License: Sendblue Sandboxes: Not listed; Zipbox: Not listed
BYOC: Sendblue Sandboxes: Not listed; Zipbox: Not listed

Hourly cost

One sandbox running for one hour

Size

Sendblue Sandboxes

Zipbox

1 vCPU · 2 GiB: Sendblue Sandboxes: $0.165; Zipbox: $0.007
2 vCPU · 4 GiB: Sendblue Sandboxes: $0.330; Zipbox: $0.014
4 vCPU · 8 GiB: Sendblue Sandboxes: $0.660; Zipbox: $0.027

Compute only, at list rates.

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Which one fits

Based on the fields above

Sendblue Sandboxes fits when

You want the larger free credit: $100 against $25.
You need SOC 2 Type II and HIPAA.

Zipbox fits when

You want each sandbox in its own microVM.
You use MCP, Claude Code, the Claude Agent SDK, the OpenAI Agents SDK, the Vercel AI SDK or LangChain.
You want the lower list price: $0.014 against $0.330 an hour for 2 vCPU and 4 GiB.
You need a desktop in the sandbox.

More comparisons

See all comparisons

Sendblue Sandboxes

Zipbox

What is different

Full comparison

Pricing

Limits

Platform

Developer

Trust

Hourly cost

Which one fits

Sendblue Sandboxes fits when

Zipbox fits when

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