Compare · checked 2026-11-14
kosa8 compared with other AI agent sandboxes
One page per product: a short verdict, a feature table, where the other product is stronger, and how to move code across. Every fact about another product links to that vendor's own documentation, read on 2026-11-14. For the categories behind them, see the best AI agent sandboxes in 2026.
kosa8 vs E2B
E2B: Firecracker microVMs with fork, pause and five managed regions. kosa8: microVMs on your machines, air-gapped or kosa8 Cloud.
compare →kosa8 vs Daytona
Daytona: containers by default, VM sandboxes with fork, GPUs, Windows and macOS. kosa8: a microVM every time, on your machines or kosa8 Cloud.
compare →kosa8 vs Modal
Modal: gVisor or VM sandboxes with GPUs in many regions. kosa8: microVMs on your machines or kosa8 Cloud, with live fork and rewind.
compare →kosa8 vs Vercel Sandbox
Vercel: Firecracker microVMs in 19 regions with a strong egress firewall. kosa8: microVMs anywhere you run them, with live fork and rewind.
compare →kosa8 vs Cloudflare Sandboxes
Cloudflare: Firecracker-backed containers started from a Durable Object across its network. kosa8: microVMs on your machines or kosa8 Cloud.
compare →kosa8 vs Runloop
Runloop: managed VM devboxes, deploy into your AWS, GCP or Azure account. kosa8: microVMs you run anywhere, saving memory as well as disk.
compare →kosa8 vs Northflank
Northflank: a full platform with microVM and gVisor sandboxes, 17 regions, wide BYOC and GPUs. kosa8: microVMs with live fork and rewind.
compare →kosa8 vs Blaxel
Blaxel: microVMs that sleep and resume in under 25 ms, with memory fork in preview. kosa8: microVMs on your machines, air-gapped or kosa8 Cloud.
compare →kosa8 vs Docker
Docker: containers share the host kernel; Docker Sandboxes put agents in local microVMs. kosa8: microVMs with rewind, fork and audit.
compare →kosa8 vs Firecracker
Firecracker: the Apache-2.0 VMM behind AWS Lambda, which you build a platform around. kosa8: a finished sandbox product with network, keys, audit and rewind.
compare →At a glance
| Product | Isolation | Self-host and air-gap | Fork a running VM |
|---|---|---|---|
| kosa8 | A microVM per sandbox with its own Linux kernel: Apple's Virtualization framework on a Mac, Cloud Hypervisor on KVM on x86-64 Linux; kosa8 Cloud runs the same sandboxes on kosa8's hosts | Yes: your computer, your own KVM Linux servers, or an air-gapped site with a signed offline licence (Enterprise, quoted) | Yes: live copies with memory and processes intact (kosa8 fork; on Cloud up to 100 per call). Plans count how many copies run at once |
| E2B | Firecracker microVM per sandbox, its own kernel | E2B Embed, Apache-2.0, on one Linux machine with hardware virtualization; air-gapped install not documented | Yes: sandbox.fork() pauses, captures memory and files, and resumes; active connections drop |
| Daytona | Linux containers by default; VM sandboxes with their own kernel; GPU sandboxes are containers | Not documented; its GitHub repository says it is no longer maintained and core work moved to a private codebase | Yes for VM sandboxes, memory and files, with a fork tree; not for containers |
| Modal | gVisor by default, or a VM runtime with its own Linux kernel; GPU sandboxes need gVisor | Not documented | No live fork; a memory snapshot restores an exact clone, but taking one terminates the sandbox |
| Vercel Sandbox | Firecracker microVM per sandbox with a dedicated kernel | Not documented; sandboxes run on Vercel's infrastructure | No live fork: Sandbox.fork() starts from the last saved snapshot and does not capture unsaved changes |
| Cloudflare Sandboxes | A Linux container inside a Firecracker microVM with its own kernel and network; Dynamic Workers run in the Workers runtime | Not documented | Not documented; a snapshot handle can be restored later, also from another Durable Object |
| Runloop | VM-based, described as micro-VM plus container on a custom bare-metal hypervisor; the hypervisor is not named | Air-gapped not documented; Deploy to VPC runs Runloop in your own cloud account | No live fork; new devboxes start from a disk snapshot |
| Northflank | MicroVMs for CPU sandboxes and gVisor for GPU sandboxes on its cloud; Kata Containers and gVisor in your cloud | Your VPC, on premises or air-gapped on Enterprise | Not documented; volume clones only |
| Blaxel | MicroVMs; the hypervisor is not named | Not documented; bring-your-own-metal in your VPC keeps Blaxel's control plane | Yes, in private preview: memory, files and processes |
| Docker | Containers: namespaces and cgroups on the host kernel. Docker Sandboxes: a microVM per sandbox with its own kernel, on Docker's own VMM | Engine: you install and run it; offline use not documented. Sandboxes: local, with a Docker sign-in; offline not documented | Not documented; docker commit saves files to an image, without volumes |
| Firecracker | KVM microVMs, with a jailer for chroot, namespaces, cgroups and a privilege drop | Yes: you run it on your own Linux hosts; air-gapped use not documented | Build it yourself: restoring one snapshot into many VMs duplicates IDs and random state, and clones share network config |
Sources are on each comparison page. "Not documented" means the vendor's pages did not say on 2026-11-14.
Questions
How were these comparisons made?
Every fact about another product comes from that vendor's own documentation or pricing page, read on 2026-11-14 and linked on each page. Where a vendor's pages do not say, the page says not documented. kosa8's own column is checked against kosa8's docs.
Which AI agent sandbox is best?
It depends on where code may run and what you must prove. Managed clouds such as E2B, Daytona, Modal and Vercel Sandbox suit elastic, server-side workloads. kosa8 suits teams that need the sandbox on their own computer, their own servers or an air-gapped site, with rewind, fork and a verifiable audit log.
Does kosa8 have a SOC 2 report?
No. SOC 2 is in progress and there is no report yet, and there has been no external penetration test yet. The Trust Center says where things stand.
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