Sandboxer vs Upstash Box

Upstash Box gives each box its own Docker container with filesystem, shell and a built-in agent (Claude Code, Codex, OpenCode, Cursor). It differs from Sandboxer in container rather than VM isolation and in an LLM-budget-inclusive pricing model. Pick Upstash Box for simple agent boxes tied to Upstash services; pick Sandboxer for full VMs with Docker and nested KVM.

Checked against Upstash Box's public docs on October 24, 2026. Sources are linked in the table and listed below.

At a glance

Sandboxer and Upstash Box compared
Capability	Sandboxer	Upstash Box
Isolation	microVM Cloud Hypervisor, its own kernel	Docker container Own filesystem, process tree and network stack.
Full Linux with root	Ubuntu 24.04, sudo, systemd
Docker inside	Preinstalled
Nested virtualization (/dev/kvm)
Pause and resume with memory	Running processes come back	Idle standard boxes freeze: storage is preserved but running processes are stopped until the next request wakes the box.
Fork a sandbox	Copy-on-write disk copy that boots fresh	partial Snapshots capture workspace state and new boxes can be created from them; not called fork.
HTTPS URL per port	Private with a token, or public	Each public URL maps to a specific port and can optionally require authentication.
Longest session	No limit on paid plans Auto-stop is up to 30 days or off	no stated limit Idle auto-pause; keepAlive on paid plans.
Billing	Per second, flat rate per size Stopped sandboxes are free	per active CPU hour or fixed monthly per box Small $0.10, Medium $0.20, Large $0.40 per active CPU hour (CPU actually consumed, in core-hours); Keep Alive boxes $8/$16/$32 per month; storage $0.10/GB-month.
GPUs
Self-host or open source
Regions	US East (Virginia) and EU Central (Finland)	us-east-1 (AWS) referenced No region list.

= not documented publicly.

Price for one 4 vCPU, 8 GB machine

Sandboxer

$0.036/hour

Flat per-second rate for the default size

Upstash Box

$0.80/hour

Medium box (4 vCPU / 8 GB / 30 GB) at $0.20 per active CPU hour x 4 cores fully busy; billed only for CPU actually used (idle = $0). Fixed Keep Alive alternative: $16/month

List prices from each provider's pricing page, before free credits, plans and storage. This compares price only.

Where Upstash Box is strong

Built-in agents (Claude Code, Codex, OpenCode, Cursor) and SDKs in TypeScript and Python.
SSH access to each box.
Free plan with 10 concurrent boxes.
Fixed always-on boxes from $8/month.

Where Sandboxer differs

Boxes are Docker containers sharing a host kernel; Sandboxer sandboxes are microVMs with their own kernel.
Boxes freeze when idle and stop running processes; Sandboxer stop saves memory and resume brings processes back.
Upstash bills CPU actually consumed (active CPU hours) or fixed monthly per box; Sandboxer bills per second by machine size.

Pick Upstash Box if

You want a container-based box with an agent built in.
You already use Upstash services.
You want a fixed monthly price for an always-on box ($8 to $32).

Pick Sandboxer if

Your workload needs a full Ubuntu VM with systemd, Docker preinstalled and nested KVM.
You want coding agents (Claude Code, Codex, OpenCode, Pi, Kimi Code, Mistral Vibe) preinstalled and driven through a prompt API.
You want stop/resume that keeps memory and running processes, with sessions that can run with no time limit on a paid plan.

Sources

Products change. If something here is out of date, email hello@sandboxer.com and we'll fix it. Upstash Box is a trademark of its owner. Sandboxer is an independent product and is not affiliated with Upstash Box.

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