Agent 37 Review 2026: Isolated AI Agent Sandbox Hosting
VerifiedHost Hermes, OpenClaw, Claude Code, Codex, OpenCode, Grok, Pi, or custom harnesses in isolated gVisor sandboxes at up to 94% lower cost than most sandbox providers.
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Give Every Customer Their Own Isolated Agent Sandbox
Agent 37 is Y Combinator-backed infrastructure for hosting AI agents -- Hermes, OpenClaw, Claude Code, Codex, OpenCode, Grok, Pi, or your own custom harness -- each in its own isolated sandbox. It bills per minute of compute and per GB of retained disk, with no subscription and a $5 starter credit, claiming up to 94% lower cost than most sandbox providers (with a refund if you find a cheaper one). It already powers agents for 100+ companies, with gVisor kernel isolation and SOC 2 Type I security.
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Quick Summary
Best For Developers and startups who need isolated, per-customer agent sandboxes without running their own infrastructure Pricing $0.80/vCPU + $0.70/GB RAM + $0.09/GB disk per 730-hour month, metered by the minute; $5 starter credit Free Plan Yes Ease of Use 4.0/5 Business Value 4.3/5
What Is Agent 37 and Why Does It Matter?
Agent 37 positions itself as infrastructure for hosting any agent harness, giving every customer an agent in its own isolated sandbox at up to 94% lower cost than most sandbox providers. The site names Hermes, OpenClaw, Claude Code, Codex, OpenCode, Grok, Pi, and custom harnesses, and says it is backed by Y Combinator and powers agents for over 100 companies. Its pricing page compares 30 providers at published rates, with Agent 37 charging $0.80 per vCPU, $0.70 per GB of RAM, and $0.09 per GB of disk per 730-hour month, metered by the minute, and a $0.73 monthly estimate for 2 vCPU, 4 GB, 4 GB disk at 8% awake time. Security claims include gVisor kernel isolation, Cloudflare edge entry, firewalled egress, encryption at rest and in transit, and SOC 2 Type I with Type II in progress.
Who Should Use Agent 37?
- Operators & power users Individuals who want to deploy and manage OpenClaw or Hermes agents from a browser dashboard with a task board, web terminal, file browser, live desktop, and scheduled jobs — no VPS or Docker setup needed.
- Startups building agent products Developers who need to create one isolated, always-on agent per user via a single API call (POST /v1/instances), with each agent having its own disk and URL, billed per minute.
- Non-technical founders Founders who want to automate workflows without deep technical setup, as testimonials highlight ease of use, handholding, and community support for non-technical users.
- Enterprise teams & white-label resellers Teams that want to offer branded, always-on agents to their own customers, with Agent 37 running the instances, uptime, and billing controls behind the scenes.
Professional reality: While the platform claims SOC 2 Type I (with Type II in progress) and emphasizes security, it does not publicly list detailed compliance certifications beyond that, and the pricing page notes there is no free tier, so you must pay for hosting even though the underlying agent software is free.
Agent 37 Features That Drive Results
Host any agent harness
Run Hermes, OpenClaw, Claude Code, Codex, OpenCode, Grok, Pi, or your own custom harness. You can also bring your own Docker image, and preinstall your own skills, prompts, and tools with a custom template.
Ship agents on the framework you already build with, without rewriting them for a new runtime.
One sandbox per customer
One call provisions a sandbox per customer. Each sandbox is enforced by gVisor with its own filesystem and a hard disk quota, so tenants can never see each other. Hosts have no public hostname, and every request enters through Cloudflare's edge over TLS and needs your API key unless you've explicitly made a port public.
Keep each customer's agents, files, and credentials separate by default.
Give your agent room to work
Agents get a browser and a full desktop they drive, plus a terminal with root on a real Linux machine to install software, run scripts, and serve apps. Desktop is available through a custom template, and you can watch the agent work and take over when it needs you.
Let agents do real multi-step work instead of only returning text.
Files stay with your agent
Files stay with your agent across sessions, sleep, and restarts. Sleep when idle and wake on the next request, with automatic backups and restore when you need it. Message a sandbox across as many sessions as you like; its files, memory, and connected tools stay put until you delete it.
Agents pick up where they left off instead of starting from zero every session.
Models, apps, and paid tools
Use Claude, OpenAI, Gemini, and Grok as managed models or bring your own key. Connect Gmail, Slack, Notion, GitHub, and Google Calendar, with 1,000+ app connections via Composio. Paid tools for web scraping, social data, people and companies, image and video, and email and calls are bought one call at a time, about a cent each, through Perflo, with no vendor accounts or keys.
Wire agents into the tools your customers already use without managing vendor accounts.
Infrastructure handled for you
Servers are hosted and maintained as you grow. Create, stop, restart, resize, update, and delete sandboxes over the lifecycle, with an authenticated web address for every agent. Track usage and set spending limits, and give an agent a cron schedule so it runs unattended while you read the results.
Run a fleet of customer agents without operating the servers yourself.
Agent 37 Pricing in 2026
Agent37 charges $0.80 per vCPU, $0.70 per GB of RAM and $0.09 per GB of disk, per 730-hour month, metered by the minute. Compute stops when a sandbox sleeps; disk bills while it is retained. The site advertises 92% lower cost than most sandbox providers and offers to refund the difference if you find a cheaper sandbox. A monthly estimate for 2 vCPU, 4 GB, 4 GB persistent disk at 8% awake time (62 hrs) is $0.73 — $0.37 compute plus $0.36 disk. Start with $5 credit; add a card to unlock the starter credit, with no charge until you top up.
| Plan | Price | What You Get |
|---|
Visit the official Agent 37 website to check the latest pricing and plans.
Where Agent 37 Is Strong / Where It Needs Care
- Up to 94% lower cost than most sandbox providersAgent37 claims up to 94% lower cost than most sandbox providers, and its pricing page shows a monthly usage comparison where Agent37 is $0.73 versus Hetzner CX23 at $6.49 (8.8×), AWS EC2 c6a.large at $4.74 (6.5×), Daytona at $10.27 (14×), E2B at $10.27 (14×), Cloudflare Sandbox at $12.34 (16.8×), Modal at $14.75 (20.1×), and Vercel Sandbox at $21.13 (28.8×). The site also states: 'Find a cheaper sandbox? We'll refund the difference.'
- Isolation enforced by the kernel with gVisorEvery sandbox is enforced by gVisor, with its own filesystem and a hard disk quota. Tenants can never see each other. The site notes gVisor was built at Google. Hosts have no public hostname, and every request enters through Cloudflare's edge over TLS and needs your API key unless you've explicitly made a port public.
- Broad agent harness and model supportAgent37 supports hosting Hermes, OpenClaw, Claude Code, Codex, OpenCode, Grok, Pi, and custom harnesses, plus your own Docker image. Models include Claude, OpenAI, Gemini, and Grok, with managed models or bring your own key. Apps include Gmail, Slack, Notion, GitHub, and Google Calendar, with 1,000+ app connections via Composio.
- Security posture and data handlingAgent37 states it does not collect your prompts, files, or terminal sessions, and your data is never used to train AI models. SOC 2 Type I and readiness reports are available on request, with Type II in progress. Sandbox disks, backups, and metadata are encrypted at rest, and every connection is encrypted in transit. Egress is firewalled per sandbox: the public internet and nothing else, not the host, not private networks, deny by default.
- Pricing is metered and excludes model and tool usageAgent37 charges $0.80 per vCPU, $0.70 per GB of RAM, and $0.09 per GB of disk, per 730-hour month, metered by the minute. Compute stops when a sandbox sleeps; disk bills while it is retained. The site notes model and tool usage is separate. Pricing page comparisons are USD, before credits, plan fees, taxes, and most competitor storage, and assume full CPU use where a provider meters active CPU. The site states this compares prices, not throughput.
- Comparison estimates are illustrative, not invoicesThe pricing page states the monthly usage estimates are recurring list-rate estimates, not total invoices or identical hardware. Free allowances can make small workloads cheaper elsewhere. GB and GiB follow each provider's billing units. DIY rows are unmanaged VMs you operate yourself. Providers with no row at a given size publish a lower ceiling. Rates and sources were checked October 1, 2026.
- Some capabilities are template-dependentThe site notes that browser and desktop are available through a custom template, and the browser/desktop previews are labeled as illustrative. Custom skills and plugins require preinstalling your own skills, prompts, and tools with a custom template. Paid tools are bought one call at a time, about a cent each, through Perflo, with no vendor accounts or keys.
- Compliance status is partialAgent37 lists SOC 2 Type I and readiness reports on request, with Type II in progress. The Trust Center is referenced for controls monitored. No other certifications are published beyond what the Trust Center lists.
Real-World Use Cases
Deploy an Agent in One Click
Launch an OpenClaw or Hermes agent from the dashboard with a task board, web terminal, file browser, live desktop, and scheduled jobs — no VPS or Docker setup needed. Bring your own API keys or use bundled models, and connect WhatsApp, Telegram, and Slack through your own accounts.
Build Agent Products via API
Create an isolated, always-on sandbox for each user with one POST /v1/instances call. Each agent gets its own disk and URL, billed per minute with no subscription or plan fee. White-label by default — your customers never see Agent 37.
Automate Workflows with 1,000+ Integrations
Connect Gmail, WhatsApp, Slack, GitHub, and 1,000+ more tools via Composio in one click. Use the browser and full desktop available through a custom template for web automation, and schedule jobs to run around the clock.
Run Enterprise-Grade White-Label Agents
Give every team or customer an always-on agent under your own brand. You package the workflows and set the price; Agent 37 handles the instances, uptime, and billing controls. SOC 2 Type I certified, with Type II in progress, and your keys stay in your instance.
How to Get Started With Agent 37
Sign up and add a card to unlock your $5 starter credit -- nothing is charged until you top up.
Pick a harness -- Hermes, OpenClaw, Claude Code, Codex, OpenCode, Grok, Pi, or your own Docker image.
Provision a sandbox with one API call (POST /v1/instances) or launch one from the dashboard.
Connect apps and models, set a spending cap, and watch the agent work from the dashboard.
Is Agent 37 Worth It in 2026?
Agent 37 is worth it for developers and startups building agent products who don’t want to run their own sandbox infrastructure -- the published rates undercut Daytona, E2B, Modal, and Vercel Sandbox by a wide margin, and the $5 starter credit costs nothing to test. The main limitation is that pricing is metered down to the minute with model and tool usage billed separately, so costs need active monitoring rather than a flat monthly fee. For anyone already hosting agents on unmanaged VMs or a pricier sandbox provider, switching is a straightforward cost cut.
Agent 37 vs the Competition
| Decision Area | Agent 37 | When Another Option Wins |
|---|---|---|
| Sandbox pricing model | $0.80 per vCPU, $0.70 per GB RAM, $0.09 per GB disk per 730-hour month, metered by the minute; compute stops when a sandbox sleeps and disk bills while retained | Providers with free allowances can make small workloads cheaper elsewhere, and published rates vary by billing unit (GB vs GiB) |
| Monthly cost at 2 vCPU / 4 GB / 4 GB disk | $0.73 per month at 8% awake time (62 hrs), including a full month of retained disk | Hetzner CX23 (EU, DIY) at $6.49, AWS EC2 c6a.large (US East, DIY) at $4.74, Daytona at $10.27, E2B at $10.27, Cloudflare Sandbox at $12.34, Modal at $14.75, and Vercel Sandbox at $21.13 are all higher at this size, but DIY rows are unmanaged VMs you operate yourself |
| Isolation and security | Every sandbox is enforced by gVisor with its own filesystem and hard disk quota; hosts have no public hostname; requests enter through Cloudflare's edge over TLS with an API key; egress is firewalled per sandbox; disk, backups, and metadata encrypted at rest and in transit | Not published for competitors on their own sites |
| Agent harness support | Hosts Hermes, OpenClaw, Claude Code, Codex, OpenCode, Grok, Pi, and custom harnesses, plus your own Docker image | Not published for competitors on their own sites |
| Lifecycle and operations | Create, stop, restart, resize, update, and delete; sleep and wake on request; automatic backups with restore; usage tracking and spending limits; fleet monitoring and alerts | DIY rows such as AWS EC2, AWS Fargate, Hetzner, and DigitalOcean Droplet require you to manage isolation, agent setup, updates, and backups yourself |
Agent 37 vs Daytona
Daytona is listed at $10.27 per month for the same 2 vCPU / 4 GB / 4 GB disk profile at 8% awake time, versus Agent37 at $0.73. Agent37 also includes a full month of retained disk in its estimate, while other rows use compute charges unless their notes say otherwise.
Choose Agent 37 if: You want per-customer sandboxes with gVisor kernel isolation, sleep-and-wake lifecycle, automatic backups, and spending limits at a lower published monthly estimate. Choose Daytona if: You have an existing Daytona workflow and prefer to stay on it; this comparison only covers published pricing, not a feature-by-feature breakdown.
Agent 37 vs E2B
E2B is listed at $10.27 per month for the same 2 vCPU / 4 GB / 4 GB disk profile at 8% awake time, versus Agent37 at $0.73. Agent37's rate card is $0.80 per vCPU, $0.70 per GB RAM, and $0.09 per GB disk per 730-hour month, metered by the minute.
Choose Agent 37 if: You want to host Hermes, OpenClaw, Claude Code, Codex, OpenCode, Grok, Pi, or a custom harness in isolated sandboxes with managed infrastructure. Choose E2B if: You are already standardized on E2B; this comparison only covers published pricing, not a feature-by-feature breakdown.
Frequently Asked Questions
What is Agent 37?
Agent 37 is a platform for hosting agent harnesses. It gives every customer an agent in its own isolated sandbox, at up to 94% lower cost than most sandbox providers. It supports Hermes, OpenClaw, Claude Code, Codex, OpenCode, Grok, Pi, and custom harnesses, and is backed by Y Combinator.
How much does Agent 37 cost?
Agent 37 charges $0.80 per vCPU, $0.70 per GB of RAM, and $0.09 per GB of disk, per 730-hour month, metered by the minute. Compute is billed while your sandbox runs, and disk is billed while it is retained, awake or asleep. You can start with $5 free credit, and there is no subscription.
How does Agent 37 compare to other sandbox providers?
Agent 37 publishes a comparison of 30 providers at their published rates. At a 2 vCPU / 4 GB / 4 GB disk configuration with 8% awake time, Agent 37 estimates $0.73 per month, versus $10.27 for Daytona and E2B, $12.34 for Cloudflare Sandbox, $14.75 for Modal, and $21.13 for Vercel Sandbox. Agent 37 also offers to refund the difference if you find a cheaper sandbox.
What security and isolation does Agent 37 provide?
Every workload is treated as untrusted. Isolation is enforced by the kernel using gVisor, with its own filesystem and a hard disk quota, so tenants can never see each other. Hosts have no public hostname; every request enters through Cloudflare's edge over TLS and needs your API key unless you have explicitly made a port public. Egress is firewalled per sandbox to the public internet only, deny by default, and data is encrypted at rest and in transit. Agent 37 does not collect your prompts, files, or terminal sessions, and your data is never used to train AI models. SOC 2 Type I and readiness reports are available on request, with Type II in progress.
What can agents run inside an Agent 37 sandbox?
Each sandbox runs a full Linux machine with root access, so agents can install software, run scripts, and serve apps. Agents get a browser and a full desktop they can drive, with the ability to watch and take over. Files stay with the agent across sessions, sleep, and restarts. Agent 37 supports models from Claude, OpenAI, Gemini, and Grok, managed models or bring your own key, plus 1,000+ app connections via Composio including Gmail, Slack, Notion, GitHub, and Google Calendar. Paid tools for web scraping, social data, people and companies, image and video, and email and calls are available one call at a time, about a cent each, through Perflo.
Key Takeaways
- Agent 37 is best for developers and startups who need isolated, per-customer agent sandboxes without running their own infrastructure.
- No subscription -- billed per minute of compute plus retained disk, starting with a $5 free credit; model and tool usage meters separately.
- Biggest strength is published pricing that undercuts Daytona, E2B, Modal, and Vercel Sandbox; main limitation is metered billing that needs active monitoring.
Best Agent 37 Alternatives
- E2B — A well-known code-execution sandbox provider, listed on Agent 37’s own pricing comparison at a higher published rate.
- Replit — A broader cloud coding platform with its own AI agent, better if you want an all-in-one IDE rather than just sandbox hosting.
- Daytona and Modal — Other sandbox providers named on Agent 37’s own pricing comparison, both at higher published rates for the same workload.
Bottom Line: Agent 37 is a solid pick for developers and startups who need isolated per-customer agent sandboxes without building the infrastructure themselves -- the published rates undercut most named competitors, and the $5 starter credit costs nothing to try.
Last Reviewed: June 2026 | Reviewed by theaitoolsbox.com editorial team
Quick Answers
What does Agent 37 cost?
$0.80/vCPU + $0.70/GB RAM + $0.09/GB disk per 730-hour month, metered by the minute, with no subscription; $5 starter credit.
Who is Agent 37 best for?
Agent 37 is best for developers and startups who need isolated, per-customer agent sandboxes without running their own infrastructure.
How easy is Agent 37 to use?
One API call (POST /v1/instances) provisions a sandbox, or launch one from the dashboard -- no VPS or Docker setup needed.
Agent 37
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Pricing Plans
Free
Basic features included