Sandbox comparison · Reviewed July 2026

Blaxelvs Run Cloud

Blaxel combines agent hosting, MCP, batch jobs, and fast-resuming sandboxes. Run Cloud concentrates on hardware-isolated agent computers and extends the workflow into iOS simulation and Apple builds.

Compatibility layer

Start with the import.

Keep the provider-shaped entry point while you validate lifecycle, network, image, and storage behavior against your application.

runcloud.compat.blaxel

Category: agent infrastructure and sandboxes
Adapter: Python
API shape: SandboxInstance

Evaluate Run Cloud

sandbox.py

Beforefrom blaxel.core import SandboxInstance

Run Cloudfrom runcloud.compat.blaxel import SandboxInstance

Detailed comparison

Different control planes. A practical migration path.

This comparison focuses on architecture and workflow rather than temporary prices or benchmark claims.

Area	Blaxel	Run Cloud
Runtime model	Lightweight virtual machines optimized for agent workloads.	KVM-backed Firecracker microVMs with a dedicated kernel and filesystem.
State	Automatic standby snapshots preserve processes and filesystem after inactivity.	Explicit snapshot, fork, pause, and resume controls make branching visible to the application.
Interfaces	SDK, REST API, CLI, Console, and an MCP server.	SDKs, CLI, REST, and provider-shaped compatibility adapters.
Platform scope	Sandboxes sit beside Blaxel agent hosting, MCP hosting, and batch jobs.	Compute sits beside iOS simulators and Xcode builds for end-to-end mobile agents.
Migration path	Existing Python code imports SandboxInstance from blaxel.core.	Change the import to runcloud.compat.blaxel and test provider-specific lifecycle behavior.

Provider details were reviewed against the Blaxel Sandboxes overview. Product capabilities change; validate requirements against current vendor documentation.

Choose Blaxel

Stay when its platform is the advantage.

Teams adopting Blaxel as an integrated agent hosting and execution platform.
Workloads that benefit from automatic standby and process-state restoration.
Agents that use MCP as the primary interface to sandbox files and processes.

Choose Run Cloud

Move when the agent needs more than Linux.

Teams prioritizing a microVM runtime plus a compatible Blaxel-shaped entry point.
Mobile agents that need to control an iOS screen after generating code.
Workflows spanning Linux execution, simulator testing, and Xcode delivery.

FAQ

Blaxel migration questions.

Can Run Cloud run Blaxel-style sandbox code?+

Run Cloud offers a Blaxel-shaped Python adapter so teams can migrate core Sandbox lifecycle code incrementally. MCP hosting, agent hosting, and other Blaxel platform services remain separate concerns.

How does standby differ from pause and fork?+

Blaxel automatically transitions inactive sandboxes to standby and restores process and filesystem state. Run Cloud exposes pause, snapshot, and fork as explicit primitives for application-controlled branching.

When should I choose Blaxel?+

Choose Blaxel when you want its wider agent platform, MCP-native access, and automatic standby lifecycle as an integrated package.

When should I choose Run Cloud?+

Choose Run Cloud when your agent infrastructure must include iOS simulator control and Xcode builds alongside isolated Linux execution.

More comparisons

Compare the rest of the field.

View compatibility matrix →

ComparisonModal ComparisonE2B ComparisonCodeSandbox ComparisonVercel Sandbox ComparisonCloudflare Sandbox ComparisonFly.io Machines ComparisonDaytona

Test the migration on a real workload.

Bring one sandbox workflow, keep the familiar API shape, and measure the behavior that matters to your agents.

Start building Calculate your workload