DigitalOcean Harness Runtime vs Sendblue Sandboxes

DigitalOcean Harness Runtime costs $0.044 per vCPU-hour and Sendblue Sandboxes costs $0.165 per vCPU-hour. DigitalOcean Harness Runtime runs Firecracker microVMs. Sendblue Sandboxes runs containers.

Updated Oct 15, 2026

DigitalOcean Harness Runtime

Managed microVM sandboxes for AI agents and their code.

Isolation: Firecracker microVM
Free tier: Not listed
Max session: Not listed

Visit site DigitalOcean Harness Runtime 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

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

Field

DigitalOcean Harness Runtime

Sendblue Sandboxes

vCPU, per hour: DigitalOcean Harness Runtime: $0.044; Sendblue Sandboxes: $0.165
RAM, per GiB-hour: DigitalOcean Harness Runtime: $0.0095; Sendblue Sandboxes: Included
Billing: DigitalOcean Harness Runtime: Active CPU time only; Sendblue Sandboxes: Bundled machine time
Idle stop: DigitalOcean Harness Runtime: After 15 minutes; Sendblue Sandboxes: After 10 minutes
Largest sandbox: DigitalOcean Harness Runtime: 16 vCPU · 32 GiB; Sendblue Sandboxes: 2 vCPU · 8 GiB
Concurrent sandboxes: DigitalOcean Harness Runtime: Up to 100; Sendblue Sandboxes: Up to 5
Isolation: DigitalOcean Harness Runtime: Firecracker microVM; Sendblue Sandboxes: Container
Pause and resume: DigitalOcean Harness Runtime:; Sendblue Sandboxes: No

Full comparison

18 fields, at each provider's list price

DigitalOcean Harness Runtimedigitalocean.com/pricing/harness-runtimedigitalocean.com

Sendblue Sandboxessendblue.com/sandboxessendblue.com

Pricing

vCPU, per hour: DigitalOcean Harness Runtime: $0.044; Sendblue Sandboxes: $0.165
RAM, per GiB-hour: DigitalOcean Harness Runtime: $0.0095; Sendblue Sandboxes: Included
Storage: DigitalOcean Harness Runtime: Session volumes $0.05 per GiB-month; Sendblue Sandboxes: Not listed
Free tier: DigitalOcean Harness Runtime: Not listed; Sendblue Sandboxes: $100 free compute, once per phone number
Paid plan from: DigitalOcean Harness Runtime: Pay as you go; Sendblue Sandboxes: Not listed
Billing: DigitalOcean Harness Runtime: Active CPU time only; Sendblue Sandboxes: Bundled machine time

Limits

Max session: DigitalOcean Harness Runtime: Not listed; Sendblue Sandboxes: Not listed
Idle stop: DigitalOcean Harness Runtime: After 15 minutes; Sendblue Sandboxes: After 10 minutes
Largest sandbox: DigitalOcean Harness Runtime: 16 vCPU · 32 GiB; Sendblue Sandboxes: 2 vCPU · 8 GiB
Concurrent sandboxes: DigitalOcean Harness Runtime: Up to 100; Sendblue Sandboxes: Up to 5

Platform

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

Developer

SDKs: DigitalOcean Harness Runtime: Python; Sendblue Sandboxes: Not listed
Integrations: DigitalOcean Harness Runtime: Claude Code; Sendblue Sandboxes: Not listed

Trust

License: DigitalOcean Harness Runtime: Not listed; Sendblue Sandboxes: Not listed
BYOC: DigitalOcean Harness Runtime: Not listed; Sendblue Sandboxes: Not listed

Hourly cost

One sandbox running for one hour

Size

DigitalOcean Harness Runtime

Sendblue Sandboxes

1 vCPU · 2 GiB: DigitalOcean Harness Runtime: $0.063; Sendblue Sandboxes: $0.165
2 vCPU · 4 GiB: DigitalOcean Harness Runtime: $0.126; Sendblue Sandboxes: $0.330
4 vCPU · 8 GiB: DigitalOcean Harness Runtime: $0.252; Sendblue Sandboxes: $0.660

Compute only, at list rates.

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Which one fits

Based on the fields above

DigitalOcean Harness Runtime fits when

You want each sandbox in its own microVM.
You use Claude Code.
You want the lower list price: $0.126 against $0.330 an hour for 2 vCPU and 4 GiB.
You need snapshots.

More comparisons

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DigitalOcean Harness Runtime

Sendblue Sandboxes

What is different

Full comparison

Pricing

Limits

Platform

Developer

Trust

Hourly cost

Which one fits

DigitalOcean Harness Runtime fits when

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