Northflank vs E2B Sandboxes: which platform fits your requirements?

Northflank and E2B Sandboxes both provide isolated code execution but solve different-sized infrastructure problems.

E2B packages Firecracker microVMs as an SDK-first sandbox product, while Northflank provides secure sandboxes using Kata Containers with Cloud Hypervisor as its primary microVM approach, with Firecracker and gVisor where supported and appropriate. Northflank also runs the surrounding application stack, including APIs, workers, jobs, managed data, preview environments, workflows, and CPU or GPU workloads.

The decision is whether you need a standalone sandbox SDK or one control plane for the production architecture.

This comparison covers lifecycle, isolation, persistence, networking, GPUs, BYOC, BYOK, security, observability, pricing, and operations.

E2B is a standalone, SDK-first sandbox product. Northflank runs isolated sandboxes and their supporting production infrastructure.

• E2B fits teams that want an SDK-first AI-agent sandbox. Its JavaScript/TypeScript and Python libraries create Firecracker microVMs, execute code, manage files, expose ports, and pause or resume state.
• Northflank fits teams that need production-grade isolated CPU or GPU execution and the complete architecture supporting it. It uses Kata Containers with Cloud Hypervisor as its primary microVM approach, with Firecracker and gVisor applied where supported and appropriate. The same platform runs services, workers, jobs, managed data, persistent volumes, automatic full-stack previews, and workflows without a fixed sandbox-session duration.
• Session models differ. E2B limits continuous runtime to one hour on Hobby and 24 hours on Pro, with custom Enterprise limits. Northflank does not impose a fixed sandbox-session duration.
• Customer-cloud models differ. E2B provides AWS and GCP BYOC through Enterprise, not public self-service. Northflank has supported self-service production BYOC since 2019 across AWS, GCP, Azure, and other supported clouds, plus eligible BYOK.
• Pricing models differ. E2B offers free Hobby, $150-per-month Pro, and custom Enterprise plans, plus per-second usage. Northflank offers an always-on free Sandbox tier, per-second Pay-as-you-go Cloud without seat fees, and custom Enterprise. BYOC combines Northflank platform fees with direct cloud-provider billing.

Both platforms provide isolated execution. E2B delivers it as a standalone sandbox SDK and service, while Northflank combines secure sandboxes with complete application and infrastructure management.

E2B serves developers embedding isolated Linux environments into agents or applications through JavaScript/TypeScript or Python SDKs. Use cases include generated or user-submitted code, analysis, computer use, evaluations, and code interpreters. Templates, snapshots, forks, and pause/resume support reuse; the surrounding production stack remains separate.

Northflank serves enterprises, platform organisations, AI teams, and startups that need sandboxes inside a production architecture. Compatible images can run as isolated sandboxes, APIs, persistent workers, or one-off, scheduled, and API-triggered jobs with ports, persistent volumes, and CPU or GPU resources. Managed databases, caches, queues, and object storage share the same control plane.

For isolation, Northflank uses Kata Containers with Cloud Hypervisor as its primary microVM approach, with Firecracker and gVisor where supported and appropriate. In BYOC, runtime availability depends on the provider, region, and node-pool configuration, while Northflank Cloud GPU workloads use gVisor by default.

E2B creates a Firecracker microVM from a prebooted snapshot. Its SDK controls commands, files, terminals, and services and applies a five-minute default timeout. Teams can pause at timeout and resume later; killing the sandbox permanently removes it. Pause preserves filesystem and memory by default, with a filesystem-only option, and paused sandboxes remain until killed. Continuous runtime is one hour on Hobby and 24 hours on Pro, with custom Enterprise limits; resuming resets that window but disconnects active clients.

Northflank sandboxes use a service lifecycle rather than a time-boxed session. The UI, API, CLI, or JavaScript client can execute commands, expose ports, restart, scale to zero, or delete them. Sandboxes can be short-lived or long-running, without a fixed session duration.

Northflank roots are ephemeral, while persistent volumes preserve repositories, datasets, models, and agent state. Scale-to-zero stops compute billing while retaining the volume and service configuration. Templates and Workflows reproduce the wider topology.

E2B builds Dockerfile or SDK templates into prebooted snapshots and advertises 80 ms same-region starts. It also supports persistent snapshots and live-state forks.

Northflank accepts images or Git builds using Dockerfiles or Buildpacks. MicroVM boot takes under one second; images and workload initialisation affect readiness. Northflank Templates define platform resources, not prebooted VMs.

E2B supports 20 concurrent sandboxes on Hobby and 100 to 1,100 on Pro; Enterprise limits are custom. These limits describe sandbox concurrency, not application autoscaling.

Northflank supports vertical scaling, scale-to-zero, and horizontal autoscaling by CPU, memory, requests, or Prometheus metrics. BYOC adds node-pool scaling, spot capacity, custom plans, placement, and scheduling. Northflank has no fixed sandbox-session or concurrency model.

E2B includes 10 GiB disk on Hobby and 20 GiB on Pro. Internet is on by default, with allow/deny egress controls and generated port hostnames.

Northflank combines ephemeral roots and volumes with private DNS, multi-project networking, network policies, public ports, and BYOC static egress.

Northflank supports GPU-backed sandboxes, model-serving services and jobs. E2B’s public managed offering does not include GPU sandboxes.

E2B provides JavaScript/TypeScript and Python SDKs for lifecycle, commands, files, terminals, metrics, and networking. Code Interpreter adds runCode; the CLI manages sandboxes and templates.

Northflank supports Git-to-deploy, Dockerfiles, Buildpacks, registries, Workflows, Templates, GitOps, API, CLI, and JavaScript client.

Northflank Skills help Codex, Claude Code, Cursor, and compatible agents deploy and troubleshoot through the API and CLI, subject to credentials, RBAC, and audit controls.

E2B can expose temporary applications but does not orchestrate managed full-stack previews.

Northflank Preview Blueprints create branch or pull-request environments with applications, data, jobs, volumes, private networking, seed workflows, and unique URLs.

Northflank offers Northflank Cloud, production BYOC, and BYOK. Self-service BYOC, supported since 2019, retains the customer’s bill, VPC, capacity, and commitments across AWS, GCP, Azure, and other providers. BYOK connects eligible cloud, on-premises, or bare-metal Kubernetes.

Northflank BYOC and BYOK require at least 12 vCPUs and 24 GB; BYOC needs at least one node and BYOK three.

E2B provides AWS and GCP BYOC through Enterprise rather than public self-service; the agreement defines architecture and responsibility. Northflank BYOC is self-service, with Enterprise assistance available.

E2B’s Apache-2.0 self-hosting is separate from Enterprise BYOC and transfers deployment, upgrades, reliability, authentication, and observability to the customer.

E2B uses a Firecracker microVM per sandbox. It provides logs, resource metrics, events, webhooks, access tokens, network restrictions, and best-effort OpenTelemetry export. RBAC is not yet available.

Northflank uses Kata Containers with Cloud Hypervisor as its primary microVM approach, with Firecracker and gVisor where supported and appropriate. BYOC runtime availability depends on provider, region, and node-pool configuration; Northflank Cloud GPUs use gVisor by default.

Northflank provides logs and metrics, health checks, alerts, audit logs, log sinks, and BYOC monitoring. Enterprise can include RBAC, SSO, directory sync, scoped access, customer-VPC placement, 24/7 support, SLAs, and FDE onboarding.

E2B adds sandbox usage to plan fees. Northflank bills Cloud compute per second or combines BYOC platform fees with direct infrastructure billing.

• E2B: Hobby has no plan fee, a one-time $100 credit, 20 concurrent sandboxes, and a one-hour limit. Pro is $150 per month plus usage, includes 100 concurrent sandboxes, offers paid concurrency up to 1,100, and allows 24 hours. CPU and memory are billed per second; Enterprise and BYOC are custom.
• Northflank: The always-on free Sandbox tier includes two services, one database, and two cron jobs. Self-service Pay-as-you-go Cloud has no seat fees and starts at $0.01667 per vCPU-hour and $0.00833 per GB-hour, billed per second, plus storage, network, and GPUs. Enterprise is custom. BYOC combines platform fees with direct cloud-provider billing, preserving credits and commitments.

Compare runtime, concurrency, supporting infrastructure, storage, transfer, GPUs, enterprise features, and operations. Northflank can reduce sustained full-stack costs through per-second pricing, no pay-as-you-go seat fees, infrastructure controls, cloud commitments, or BYOC. E2B combines per-second CPU and memory charges with its plan.

E2B fits teams that want an SDK-first sandbox product while operating the production platform elsewhere.

• You want JavaScript/TypeScript or Python SDKs designed specifically for agent sandbox control.
• Prebooted VM templates, snapshots, forks, and memory-preserving pause/resume are central requirements.
• The Hobby or Pro runtime windows fit, or you will negotiate Enterprise limits.
• You operate the supporting production platform elsewhere.
• An Enterprise-arranged BYOC deployment on AWS or GCP, or customer-operated open-source self-hosting, fits your responsibility model.

Northflank fits teams that need production-grade isolated CPU or GPU sandboxes with control over the complete application stack, deployment location, networking, Kubernetes infrastructure, security, and observability.

• Sandboxes must share a control plane with applications, data, previews, and releases.
• CPU and GPU workloads need one platform.
• Developers need governed self-service without operating Kubernetes directly.
• Platform teams need autoscaling, placement, and capacity controls.
• Production multi-cloud BYOC, customer-VPC placement, or eligible BYOK on public cloud, on-premises, or bare metal is required.
• Direct cloud-provider billing, existing commitments, or infrastructure efficiency materially affect cost.

E2B fits when you want an SDK-first product for controlling isolated Linux environments while the production platform remains elsewhere.

Northflank fits when sandboxes operate alongside APIs, workers, jobs, queues, databases, private dependencies, observability, or GPUs. It brings these resources into one control plane across Northflank Cloud, self-service production BYOC, or eligible BYOK, with governed developer self-service and platform-team control.

These answers cover common buyer questions.

Both platforms provide isolated code execution. E2B delivers it through an SDK-first Firecracker sandbox service, while Northflank provides production-grade secure sandboxes through a control plane that also runs services, workers, jobs, managed data, previews, GPUs, and customer-controlled infrastructure.

Yes. Northflank provides programmatically controlled, isolated CPU or GPU sandboxes and also runs the APIs, workers, jobs, managed data, networking, previews, and infrastructure supporting them. E2B provides a specialised SDK-first interface for teams whose primary requirement is Firecracker sandbox creation and control.

E2B fits agents that need programmatic Firecracker environments with template and pause/resume APIs. Northflank fits agents that need isolated CPU or GPU execution alongside production APIs, workers, jobs, managed data, private networking, observability, and customer-cloud infrastructure.

E2B’s pause-and-resume flow preserves filesystem and memory, or only the filesystem. Snapshots are independently managed, reusable captures that can create multiple new sandboxes. Northflank persistent volumes preserve repositories, datasets, models, and agent state across restarts and scale-to-zero, while Templates reproduce the wider application topology.

Yes, through an Enterprise engagement rather than a public self-service path. E2B offers BYOC for AWS and GCP. Northflank provides self-service production BYOC across supported cloud providers, with Enterprise assistance available when required.

Northflank supports GPU-backed sandboxes, services, and jobs on managed or customer-cloud infrastructure. E2B’s public managed offering does not include GPU sandboxes.

Northflank can reduce sustained full-stack costs through per-second pricing, no pay-as-you-go seat fees, infrastructure controls, and production BYOC. E2B can suit intermittent sandbox-only use through per-second running-sandbox charges. Compare the complete topology and retained operations.