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When you create a Sailbox, you specify the size of the VM. You are eligible to use all the resources in your VM and you are only charged 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 spend; they do not reserve anything, so a bigger size costs nothing extra while the Sailbox sits 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. The Billing page holds 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

Only at creation, and only slightly: the creation charge differs by size. Ongoing charges follow what the Sailbox uses, so an l Sailbox that idles at 0.05 vCPU costs the same per hour as an s doing the same.
Nothing. Sleeping, paused, checkpointing, and cold-starting time is not billed. Charges resume when the Sailbox is running again.
Yes. A Sailbox started from a checkpoint is a full Sailbox: it pays the creation charge for its size and bills for its own usage until it sleeps or you terminate it. Clean up a fleet when the work is done.
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.