Northflank vs Vercel Sandbox: which platform fits your requirements?

Northflank and Vercel Sandbox overlap on isolated code execution but solve different-sized infrastructure problems. Vercel Sandbox is a focused SDK and CLI for Firecracker microVMs. Northflank sandboxes use Kata Containers with Cloud Hypervisor or Firecracker for microVM isolation, plus gVisor where appropriate, within a broader platform for APIs, workers, jobs, managed data, previews, workflows, and CPU or GPU workloads.

The decision is whether you need a dedicated execution primitive or one control plane for the sandbox and its supporting production architecture.

This comparison covers sandbox lifecycle, isolation, persistence, networking, developer experience, workload support, GPUs, Bring Your Own Cloud (BYOC), Bring Your Own Kubernetes (Northflank BYOK), security, observability, pricing, and operational responsibility.

• Vercel Sandbox fits teams that need a specialised sandbox API. It provides TypeScript and Python SDKs, a CLI, Firecracker microVM isolation, OCI images, automatic persistent sandboxes, snapshots, and active-CPU billing.
• Northflank fits teams that need isolated sandboxes as part of a broader production stack. It supports Kata Containers with Cloud Hypervisor or Firecracker for microVM isolation and gVisor where appropriate, alongside persistent services and workers, jobs, managed databases and queues, volumes, previews, workflows, and GPU workloads.
• Their infrastructure models differ. Vercel Sandbox runs on Vercel-managed infrastructure in four regions, while Vercel's AWS BYOC is currently a separate private-beta offering for apps and agents. Northflank offers self-service production multi-cloud BYOC, available since 2019, and eligible Northflank BYOK, including on-premises and bare metal.
• Compare total architecture cost, not one compute rate. Vercel's active-CPU model can suit bursty or I/O-bound sandbox sessions. Northflank can reduce total cost for sustained production stacks through per-second billing, infrastructure controls, no pay-as-you-go seat fees, and direct cloud-provider billing in BYOC.

Vercel Sandbox is designed for engineers who want on-demand execution embedded in an application. Its SDK abstracts microVM creation, commands, files, processes, ports, persistence, and teardown for generated code, uploads, playgrounds, and development servers.

Northflank is designed for enterprises, platform organisations, AI engineering teams, and startups that need sandboxes within a broader production architecture. Northflank sandboxes are services that use compatible images, execute commands, expose ports, attach volumes, run on CPU or GPU resources, and support programmatic lifecycle control.

The Northflank control plane can run the agent API, scheduler, workers, jobs, queues, databases, model-serving workloads, and telemetry. Developers receive a self-service abstraction instead of direct Kubernetes access, while platform teams retain infrastructure and governance controls.

Vercel exposes a dedicated sandbox-and-session abstraction. Northflank models a sandbox as an isolated service whose lifecycle can be coordinated with the surrounding application.

Vercel Sandbox's Sandbox.create() starts a five-minute session. Maximum duration is 45 minutes on Hobby and 24 hours on Pro and Enterprise, with extensions within that limit. Vercel Sandbox discards non-persistent filesystems on stop.

Vercel Sandbox persistence is generally available and enabled by default. Vercel Sandbox snapshots the filesystem when a session stops and restores it when activity resumes. Teams can disable persistence for ephemeral workloads; snapshots incur storage charges. Private-beta Drives on Pro and Enterprise provide sandbox-independent storage for non-critical data.

Northflank starts compatible images on Northflank Cloud or BYOC, with programmatic create, start, pause, restart, and destroy operations. Sandbox boot takes under one second, while end-to-end readiness depends on image retrieval and workload initialization.

Northflank volumes preserve repositories, agent state, datasets, or models beyond the ephemeral root filesystem. Templates reproduce a sandbox or complete topology; unlike snapshots, they are infrastructure definitions.

Northflank sandboxes follow a service lifecycle rather than fixed-duration sessions. Teams can automate pause, restart, scale, or teardown with the application lifecycle.

Northflank supports a broader production topology, while Vercel Sandbox gives isolated sessions a focused execution interface.

Vercel Sandbox SDK v3 defaults to Managed Images instead of the deprecated named runtime options. Its universal image uses Ubuntu 26.04 with Node.js 24, Python 3.14, coding agents, and common tools; Vercel also supplies language-specific images and supports public-beta custom OCI images. A sandbox can also start from a public or authenticated private Git repository source, which is separate from Vercel's Git-triggered deployment workflow. Limits are 4 vCPUs on Hobby, 8 on Pro, and 32 on Enterprise, with 2 GB RAM per vCPU. Vercel Sandbox operates in iad1, sfo1, cle1, and cdg1 and does not offer GPU compute.

Vercel Functions remain separate request-driven compute. Beta Vercel Services adds long-running and backend-only workloads, private service communication, and Dockerfile support. Services, deployments, Workflows, storage, and Queues can support agents but remain outside the Sandbox lifecycle API.

Northflank runs compatible container images as isolated sandboxes, persistent services and workers, or one-off, scheduled, and API-triggered jobs. Northflank Cloud plans range from 0.1 to 32 vCPU and 256 MB to 256 GB of memory, while BYOC supports custom resource plans and workload placement. Persistent volumes can attach to sandbox or application workloads, and managed addons provide databases, caches, queues, and object storage in the same control plane.

Northflank supports GPU sandboxes, model-serving services, and GPU jobs in GPU-enabled Northflank regions or compatible BYOC node pools. Teams can separate CPU and GPU pools, control placement, and run sandbox execution beside the APIs, queues, data, and workers that support an agent.

Northflank supports vertical scaling, scale-to-zero, and horizontal autoscaling by CPU, memory, requests, or custom Prometheus metrics. BYOC adds node-pool scaling, spot capacity, custom plans, and scheduling controls.

Vercel Sandbox permits 10 concurrent sandboxes on Hobby and 10,000 by default on Pro and Enterprise, with a dynamic allocation quota that can ramp up to 5,000 vCPUs per minute. Northflank does not use a fixed sandbox-session duration or concurrency model: sandbox services can remain running, pause, or scale with the application. Northflank Cloud quotas and available capacity still apply, while BYOC capacity depends on the customer's clusters and node pools.

Both platforms are designed for isolated execution of untrusted code. Northflank extends networking and governance across the surrounding production infrastructure.

Each Vercel Sandbox uses a Firecracker microVM with its own filesystem and network. Its host-enforced firewall supports allow-all, deny-all, domain and CIDR rules, and live updates. Credential brokering keeps secrets outside the guest; beta request matchers and proxying filter or forward selected traffic. Configured ports use unique sandbox URLs rather than private VPC connectivity.

Northflank supports multiple isolation runtimes. Kata Containers runs containers inside microVMs using Cloud Hypervisor or Firecracker, while gVisor provides a user-space kernel boundary. Kata with Cloud Hypervisor is Northflank's primary production microVM approach; Northflank Cloud GPU workloads use gVisor by default, and BYOC uses the runtime selected for its node pool. Private networking connects application resources, with policies, multi-project access, configurable static egress, and customer-VPC routing.

Vercel provides command output, live logs, active-sandbox views, and metrics; wider observability is separate. Northflank provides logs and metrics across sandboxes, services, builds, jobs, and addons, alongside health checks, infrastructure alerts, audit logs, external log sinks, and BYOC cluster monitoring.

Vercel's wider platform offers RBAC, SAML SSO, Directory Sync, audit logs, and compliance programmes. Paid Enterprise Secure Compute supplies an isolated network, outbound IPs, and VPC peering for supported Vercel workloads, but it is separate from a Sandbox BYOC deployment model.

Northflank provides granular RBAC, scoped API roles, secrets, SSO, directory sync, audit logs, and policies. Enterprise can include customer-VPC operation, 24/7 support and SLAs, infrastructure audits, and forward-deployed engineering onboarding.

Vercel provides a sandbox-specific SDK workflow, while Northflank provides sandbox automation within a broader deployment and infrastructure platform.

Vercel provides TypeScript and Python SDKs plus a CLI. OIDC authenticates Vercel deployments; tokens support external apps and CI. AI SDK tooling and an OpenAI Agents SDK example extend integration.

Northflank supports Git-to-deploy, Dockerfiles, buildpacks, and registries. Automation includes Workflows, templates, GitOps, API, CLI, and JavaScript client.

Northflank Skills guide compatible coding agents such as Codex, Claude Code, Cursor, and others in deployment and troubleshooting through the API and CLI. Credentials, RBAC, and audit controls still apply.

Vercel Sandbox can expose a server inside one sandbox; Vercel Deployments separately provide web previews. Northflank Preview Blueprints can create per-branch or pull-request stacks with services, jobs, databases, volumes, private networking, seed workflows, and URLs.

Northflank has a mature production multi-cloud model. Vercel Sandbox runs on Vercel-managed infrastructure, while Vercel's AWS BYOC is currently a separate private-beta offering for apps and agents.

Northflank has supported production Bring Your Own Cloud (BYOC) since 2019 across AWS, GCP, Azure, and other supported providers. Customers own the account, network, capacity, and infrastructure bill.

Northflank Bring Your Own Kubernetes (BYOK) connects eligible public-cloud, on-premises, or bare-metal clusters. Northflank currently requires at least 12 vCPUs and 24 GB per BYOC or BYOK cluster. BYOC requires a minimum of one node, while BYOK requires a minimum of three nodes, with compatible networking and storage.

Vercel's AWS BYOC for apps and agents is private beta. Vercel Sandbox currently runs on Vercel-managed infrastructure rather than through a customer-cloud deployment option. Vercel does not offer BYOK, on-premises, bare-metal, or supported Sandbox self-hosting.

Vercel meters individual Sandbox resources and activity. Northflank bills Northflank Cloud compute per second; in BYOC, Northflank charges platform fees while the cloud provider bills the customer directly for infrastructure.

• Vercel Sandbox: Pro costs $20 per month for one deploying seat and includes a $20 usage credit. Starting rates are $0.128 per active vCPU-hour and $0.0212 per provisioned GB-hour, with separate charges for creations, transfer, snapshots, and images. CPU bills only while active; memory bills for the session's wall-clock duration. This can suit short or I/O-heavy sessions.
• Northflank: The free Sandbox account tier provides always-on compute with two services, one database, and two cron jobs; it is distinct from isolated sandbox workloads. Northflank Cloud pricing is billed per second without pay-as-you-go seat fees, starting at $0.01667 per vCPU-hour and $0.00833 per GB-hour, plus storage and egress. BYOC combines Northflank platform fees with direct cloud-provider billing, preserving negotiated rates, credits, and commitments. This can reduce total cost for sustained production stacks while customers retain responsibility for their cloud account, network, capacity, and policies.

Vercel Sandbox fits teams that need a focused, vendor-operated sandbox runtime closely integrated with the Vercel ecosystem.

• You want a focused SDK for creating microVMs, executing commands, managing files, and exposing temporary development servers.
• Your application already runs on Vercel and OIDC, AI SDK, Vercel projects, and Vercel observability reduce integration work.
• Default automatic persistence and snapshots fit your lifecycle; private-beta Drives are acceptable for non-critical state.
• Vercel Managed Images or custom OCI images cover execution requirements.
• You are comfortable running sandboxes on Vercel-managed infrastructure and do not need BYOK, on-premises deployment, GPUs, or Kubernetes-level controls.
• Active-CPU billing suits agents that spend significant time waiting on models, APIs, or users.

Northflank is a Vercel Sandbox alternative when isolated execution must operate as part of a complete production architecture. Both platforms can run untrusted or agent-generated code, but Northflank also manages the APIs, workers, jobs, databases, queues, volumes, previews, workflows, observability services, and GPU workloads around each sandbox.

Northflank is therefore less like a replacement sandbox SDK and more like a broader control plane. That distinction matters when platform teams need production BYOC, eligible BYOK, customer-VPC networking, Kubernetes-level infrastructure control, or governed developer self-service. Teams that only need a focused execution API closely integrated with Vercel may find Vercel Sandbox more direct.

Northflank fits teams that need sandbox execution within a broader application and infrastructure control plane.

• Sandboxes must run beside APIs, persistent workers, jobs, databases, queues, volumes, and release workflows.
• You need GPU sandboxes, model-serving services, or GPU jobs in the same control plane.
• Full-stack ephemeral environments must reproduce several interconnected components.
• Developers need governed self-service while platform teams control networks, resources, scheduling, node pools, policies, and observability.
• You want Kubernetes infrastructure without requiring each developer to manage Kubernetes directly.
• You need production multi-cloud BYOC, eligible BYOK, on-premises or bare-metal Kubernetes, or private customer-VPC placement.
• Direct cloud-provider billing, cloud commitments, spot capacity, custom plans, or workload placement affect total cost.

Vercel Sandbox fits isolated execution through a dedicated SDK, especially when the surrounding application already runs on Vercel. It combines Firecracker microVMs with automatic persistence, snapshots, egress policies, OCI image support, and active-CPU billing. It is the narrower option when the requirement is sandbox execution rather than a broader application platform.

Northflank fits when sandboxes must operate alongside APIs, workers, jobs, queues, databases, private dependencies, observability services, or GPU inference. It combines Kata Containers with Cloud Hypervisor or Firecracker, plus gVisor where appropriate, with persistent services, managed data, volumes, previews, workflows, and CPU or GPU workloads in one control plane. Teams can run that architecture on Northflank Cloud, self-service production multi-cloud BYOC, or eligible BYOK while developers receive governed self-service and platform teams retain infrastructure control.

Vercel Sandbox is an SDK-managed microVM service. Northflank includes sandboxes in a control plane for applications, managed data, GPUs, and Kubernetes infrastructure.

Vercel fits agents needing focused SDKs. Northflank fits when sandboxes share a platform with APIs, queues, data, workers, private networking, or GPUs.

Northflank persistent volumes preserve repositories, datasets, models, and agent state across restarts and pauses, while templates reproduce the wider application topology. Vercel Sandbox automatically snapshots and restores its filesystem; private-beta Drives provide sandbox-independent storage.

Vercel Sandbox currently runs on Vercel-managed infrastructure. Vercel's AWS BYOC is a private-beta offering for apps and agents rather than a Sandbox deployment option.

Northflank supports GPU sandboxes, services, and jobs where compatible capacity is available. Vercel Sandbox does not currently offer GPU compute.

Northflank can reduce sustained full-stack costs through no pay-as-you-go seat fees and production BYOC. Vercel's active-CPU model can suit short or I/O-heavy sessions. Compare memory, concurrency, storage, transfer, supporting services, and operations.