System · online · 24/7
AI sandboxes
for agents that run 24/7.
Persistent, always-on Linux machines that run 24/7 so your agents can too. Secure by default. Stateful. Always on.
Running in minutes · Cancel anytime · No lock-in
Use cases
Personal machine or platform primitive
Your dev machine in the cloud
SSH in or connect your IDE. It's just a Linux box. Close your laptop, your agents keep going.
Sandboxes as infrastructure
Spin up machines, manage files, run bash, and launch coding agents — all from one API.
Deploys in minutes
Infrastructure
Machines that don't disappear
Not ephemeral containers. Persistent compute with real IPs, daily backups, and authenticated access on every port.
Always on
Your machine runs 24/7. Close your laptop, agents keep working. Come back tomorrow — everything is still there.
Persistent storage
Real SSD. Files, Docker volumes, databases — nothing vanishes between sessions. Daily automatic backups.
Secure by default
Zero open ports. Auth proxy on every port via {port}--{slug}.kortix.cloud. SSH keys, API keys, session auth.
EU & US regions
Deploy where your users are. Helsinki and Hillsboro, OR. Region-specific pricing, same experience.
Full API control
Machine, filesystem, process, and agent APIs. Python SDK, TypeScript SDK, or raw REST.
Any AI agent
Claude Code, Codex, OpenCode, PI Coding, Cursor — or anything else that runs on Linux.
Security
Secure by default. Zero config needed.
Browser traffic goes through the authenticated proxy at {port}--{slug}.kortix.cloud. Log in via the dashboard, SSH in with your key, or authenticate programmatically with your API key.
API
Programmatic control over everything.
Machine, Filesystem, Process, and Coding Agents — all via one API.
Machine
7 endpointsProvision, inspect, and tear down compute. Create machines with specific specs, rebuild from images, snapshot for later.
Create a machineList all machinesGet machine detailsRebuild a machineDelete a machineCreate an imageList imagesFilesystem
9 endpointsFull file operations on any machine. Upload, download, search, replace, and zip — no SSH required.
List files in a directoryDownload a fileUpload a fileCreate a directoryDelete a file or directoryMove or renameSearch text in filesFind and replaceDownload as zipProcess
5 endpointsRun commands, stream stdout, kill misbehaving workers. Treat any machine like a remote shell — from code.
Execute a shell commandExecute with streamingRun a code snippetList running processesKill a processCoding Agents
One unified API for Claude Code, Codex, OpenCode, PI Coding. Session lifecycle, streaming events, and a standard schema across every agent.
Pricing
You're paying 10x too much for always-on agents.
Per-second billing sounds cheap — until your agents run 24/7. Here's what a month of continuous usage actually costs.
| Machine | E2B / Daytona / Modal *Others * | JustAVPS | You Save |
|---|---|---|---|
Starter 2 vCPU · 4 GB · 80 GB | $121/mo | from $9/mo | 10x cheaper |
BasicPopular 4 vCPU · 8 GB · 160 GB | $242/mo | from $18/mo | 12x cheaper |
Pro 8 vCPU · 16 GB · 320 GB | $484/mo | from $32/mo | 12x cheaper |
Power 12 vCPU · 24 GB · 480 GB | $725/mo | from $56/mo | 13x cheaper |
Ultra 16 vCPU · 32 GB · 640 GB | $967/mo | from $77/mo | 13x cheaper |
* Based on published per-second CPU + RAM rates across 730 h/mo continuous usage. EU specs shown — US specs vary slightly. Prices start from $9/mo.
Use JustAVPS when
Recommended- Your agents run 24/7, not minutes
- You need persistent state — files, Docker, DBs
- You want predictable cost, no bill shock
Use them when
- Sandboxes only live minutes, not months
- You need sub-second spin-up and instant teardown
- You only pay when code is actively running
About
Built by Kortix
We ran 3+ million sandboxes on incumbent providers while building Kortix. We hit the cost ceiling. So we rebuilt the infrastructure we needed.
What if I don't like it?
Cancel anytime. No contracts, no lock-in. Your data is yours — download it and leave whenever you want.
Is it really cheaper?
Do the math yourself. Daytona, E2B, Modal and others charge per-second — $0.05+/h per vCPU, $0.016+/h per GiB RAM. Run that 24/7 for a month and compare. We're 8–10x cheaper, every time.
How fast can I get started?
A couple of minutes. Pick a plan, we provision your machine, you SSH in. That's it.
What about security?
Browser access is gated by the authenticated proxy, and SSH uses keys instead of passwords. API keys and session-based access are both supported.
Which agents can I run?
Claude Code, Codex, OpenCode, PI Coding agents, Cursor workflows, and any other Linux-based agent. It's a persistent Linux machine — install what you want, run it 24/7.