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IronClaw vs Modal Sandboxes

Modal is a serverless cloud for AI and data workloads, and its Sandboxes let you run untrusted or agent-generated code in an isolated container the platform spins up for you. It solves a real problem well: you call an API, code runs in a strong isolated environment, and you never operate a cluster. The trade is architectural, not a knock on the product. Modal runs that sandbox on its infrastructure, and in most agent setups the keys and data flowing through the agent pass through that managed environment. IronClaw is the self-hosted answer to the same job.

We describe the common managed-cloud pattern here and do not assert the specifics of any named platform. Modal, for example, documents its own isolation approach, so verify those details against Modal's docs. This page is about the managed-cloud-vs-self-hosted trade so you can pick the side that fits your constraints.

The trade, honestly

Axis Modal Sandboxes (managed cloud) IronClaw (self-hosted)
Ops burden None, Modal runs it You run it, self-hosted
Where sandboxes execute On Modal's cloud On your infrastructure
Where your data lives On the platform's infrastructure On yours
Where provider keys live Commonly with the platform or passed through it Host-side on your box, never inside the sandbox
Isolation you can inspect Platform internal detail you verify from their docs gVisor + network=none + read-only rootfs, open source
Agent lifecycle (approval, per-conversation) You build the agent runtime on top Built in: one sandbox per conversation, human-approval gateway
Data residency and compliance Depends on the platform's regions and terms Fully under your control
Cost model Usage-based, per second of compute Your infrastructure, AGPLv3 + commercial
Lock-in Platform API and runtime Own the stack, portable

When Modal wins

Pick a managed serverless sandbox when zero ops and elastic scale matter most: spiky or bursty workloads, GPU jobs you do not want to run yourself, prototyping, or a team with no platform engineers. If your data and keys are comfortable living with a third party and usage-based pricing beats owning infrastructure, a hosted platform is often the faster and cheaper call. That is a legitimate choice and IronClaw does not compete for it.

When to reach for IronClaw

Reach for IronClaw when the answer to "who holds our keys and data" has to be "we do." Modal gives you a strong sandbox primitive; IronClaw gives you a complete self-hosted agent runtime built around a boundary you can inspect: the provider key never enters the box (a host-side proxy injects it and makes the outbound call), every conversation gets its own gVisor-backed sandbox with network=none and a read-only rootfs, and a human-approval gateway sits in front of capability changes with no bypass path. The isolation is open source and re-tested by a red-team containment gate on every push, so a security team can prove it rather than trust a description.

Run the self-hosted path in minutes

docker compose -f docker-compose.demo.yml up --build -d
./bin/ironctl doctor   # reports the sandbox runtime and isolation posture

Where to go next