Sandboxer vs Declaw

Declaw runs each agent execution in a Firecracker microVM and routes outbound traffic through a security proxy with guardrails, a credential vault and audit logging. Sandboxer is a general full-VM platform. Pick Declaw for built-in egress guardrails and BYOC; pick Sandboxer for a full machine with Docker and nested KVM.

Checked against Declaw's public docs on October 24, 2026. Sources are linked in the table and listed below.

At a glance

Sandboxer and Declaw compared
Capability	Sandboxer	Declaw
Isolation	microVM Cloud Hypervisor, its own kernel	Firecracker microVM Per-sandbox security proxy inspects outbound traffic.
Full Linux with root	Ubuntu 24.04, sudo, systemd	not stated on the official pages read
Docker inside	Preinstalled	not stated on the official pages read
Nested virtualization (/dev/kvm)		not stated on the official pages read
Pause and resume with memory	Running processes come back	A running microVM, including memory, CPU and disk, can be frozen and resumed.
Fork a sandbox	Copy-on-write disk copy that boots fresh	not stated on the official pages read
HTTPS URL per port	Private with a token, or public	not stated on the official pages read
Longest session	No limit on paid plans Auto-stop is up to 30 days or off	configurable timeout The server destroys the sandbox at timeout; maximum value not stated.
Billing	Per second, flat rate per size Stopped sandboxes are free	metered every 30 s, vCPU + RAM + disk Metered every 30 seconds; vCPU $0.0504/h, memory $0.0162/GB-h, disk $0.110/GB-month.
GPUs		not stated on the official pages read
Self-host or open source		Self-hosted/BYOC with Terraform modules for GCP and AWS.
Regions	US East (Virginia) and EU Central (Finland)	not stated on the official pages read

= not documented publicly.

Price for one 4 vCPU, 8 GB machine

Sandboxer

$0.036/hour

Flat per-second rate for the default size

Declaw

$0.33/hour

4 vCPU × $0.0504/h + 8 GB × $0.0162/h

List prices from each provider's pricing page, before free credits, plans and storage. This compares price only.

Where Declaw is strong

Built-in egress security proxy with PII and prompt-injection scanning.
Self-hosted/BYOC option with Terraform modules.
Credential vault, persistent volumes and audit logging in one SDK.
$100 free sandbox credit and $200 guardrail credit, no card required.

Where Sandboxer differs

Declaw puts a policy proxy with guardrails on every outbound request; Sandboxer gives a full VM with root and Docker.
Declaw is self-hostable on GCP or AWS; Sandboxer is not self-hostable.
Root, Docker, nested virtualization, fork and port URLs are not documented on the pages read.

Pick Declaw if

You need PII redaction and prompt-injection checks on agent egress.
You need to run the sandbox platform inside your own cloud account.

Pick Sandboxer if

You want a full Ubuntu 24.04 VM with root, systemd, Docker and nested KVM, with Claude Code, Codex and other coding agents preinstalled.
You want stop to save memory and disk so that resume brings running processes back, with stopped sandboxes costing nothing.
You want one flat monthly plan whose dollars come back as machine time, with sandboxes that can run with no time limit on a paid plan.

Sources

Products change. If something here is out of date, email hello@sandboxer.com and we'll fix it. Declaw is a trademark of its owner. Sandboxer is an independent product and is not affiliated with Declaw.

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