Phonebox vs Sendblue Sandboxes

Sendblue Sandboxes costs $0.165 per vCPU-hour. Phonebox limits a session to 3 hours. Sendblue Sandboxes runs containers.

Updated Oct 15, 2026

Phonebox

Cloud Android phones that AI agents control through their screens.

Isolation: Not listed
Free tier: $2 starter credit, one time, no card
Max session: 3 hours

Visit site Phonebox 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

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

Field

Phonebox

Sendblue Sandboxes

Free tier: Phonebox: $2 starter credit, one time, no card; Sendblue Sandboxes: $100 free compute, once per phone number
Idle stop: Phonebox: After 5 minutes; Sendblue Sandboxes: After 10 minutes
Pause and resume: Phonebox:; Sendblue Sandboxes: No

Full comparison

18 fields, at each provider's list price

Phoneboxphonebox.dev/pricingphonebox.dev

Sendblue Sandboxessendblue.com/sandboxessendblue.com

Pricing

vCPU, per hour: Phonebox: Not listed; Sendblue Sandboxes: $0.165
RAM, per GiB-hour: Phonebox: Not listed; Sendblue Sandboxes: Included
Storage: Phonebox: Not listed; Sendblue Sandboxes: Not listed
Free tier: Phonebox: $2 starter credit, one time, no card; Sendblue Sandboxes: $100 free compute, once per phone number
Paid plan from: Phonebox: Pay as you go; Sendblue Sandboxes: Not listed
Billing: Phonebox: Bundled machine time; Sendblue Sandboxes: Bundled machine time

Limits

Max session: Phonebox: 3 hours; Sendblue Sandboxes: Not listed
Idle stop: Phonebox: After 5 minutes; Sendblue Sandboxes: After 10 minutes
Largest sandbox: Phonebox: Not listed; Sendblue Sandboxes: 2 vCPU · 8 GiB
Concurrent sandboxes: Phonebox: Up to 5; Sendblue Sandboxes: Up to 5

Platform

Isolation: Phonebox: Not listed; Sendblue Sandboxes: Container
GPU: Phonebox: Not listed; Sendblue Sandboxes: Not listed
Snapshots: Phonebox: Not listed; Sendblue Sandboxes: Not listed
Pause and resume: Phonebox:; Sendblue Sandboxes: No

Developer

SDKs: Phonebox: TypeScript; Sendblue Sandboxes: Not listed
Integrations: Phonebox: MCP; Sendblue Sandboxes: Not listed

Trust

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

Hourly cost

One sandbox running for one hour

Size

Phonebox

Sendblue Sandboxes

1 vCPU · 2 GiB: Phonebox: Not listed; Sendblue Sandboxes: $0.165
2 vCPU · 4 GiB: Phonebox: Not listed; Sendblue Sandboxes: $0.330
4 vCPU · 8 GiB: Phonebox: Not listed; Sendblue Sandboxes: $0.660

Compute only, at list rates.

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Which one fits

Based on the fields above

Phonebox fits when

You use MCP.
You need pause and resume.

Sendblue Sandboxes fits when

You want the larger free credit: $100 against $2.

More comparisons

See all comparisons

Phonebox

Sendblue Sandboxes

What is different

Full comparison

Pricing

Limits

Platform

Developer

Trust

Hourly cost

Which one fits

Phonebox fits when

Sendblue Sandboxes fits when

More comparisons

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