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When you create a Sailbox, you specify the size of the VM. Your Sailbox can use all the resources in its VM, and you are charged only for observed usage, not capacity. For example, if a Sailbox with a 4 vCPU ceiling is using 0.01 vCPU, you are charged for 0.01 vCPU. You are not charged at all while a Sailbox is sleeping, paused, checkpointing, or cold-starting.

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What each size includes

You pick a size at create time: s, m, or l. A size sets the vCPU count and the default memory and disk ceilings, and it sets the creation charge. Ceilings cap what a workload may use. They do not reserve anything, so a bigger size doesn’t cost extra while the Sailbox is idle. Pass memory_limit_gib or disk_limit_gib at create time to set a ceiling, within the range shown. The default size is m. Choose s for the fastest cold starts and resumes. Its lower ceilings also cap what a runaway workload can consume.

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Where to see usage

  • Dashboard. The Sailboxes page at app.sailresearch.com shows spend for the period broken down by app and by Sailbox, alongside live CPU, memory, and disk utilization. Spend reflects usage within a few minutes. The Billing page shows your credit balance and invoices.
  • CLI. sail box list shows each Sailbox’s current CPU, memory, and disk usage against its ceilings, and sail box top is a live view of the same.

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FAQ

You pay for actual usage, so choosing a larger size doesn’t increase your running costs on its own. Free has a small, size-based creation fee. Pro and Enterprise don’t have one.
Nothing. Sleeping, paused, checkpointing, and cold-starting time is not billed. Charges resume when the Sailbox is running again.
Yes, the same pricing applies. Each copy bills for its own usage, with a size-based creation fee on Free and no creation fee on Pro or Enterprise.
Sail pauses your running and sleeping Sailboxes and blocks anything that would add spend: creating, resuming, and running commands. Nothing is terminated, and you can still pause and terminate from the dashboard. Add credits on the Billing page, then resume the Sailboxes you need.