Sailboxes
https://sailresearch.com/sailboxes
Sailboxes are persistent, kernel-isolated Linux virtual machines built as execution environments for long-horizon AI agents. They support Docker-in-Docker, provide root access, and allow workloads to pause, resume, and fork without losing in-memory state. A CLI/TUI and SDKs in Python, TypeScript, and Rust are provided.
| Pricing model | Observed-usage billing for CPU, RAM, and disk, plus a one-time size-based creation charge |
|---|---|
| Pricing The headline compute price as the provider states it. Sorting ranks prices stated per vCPU over time, converted to hourly. Other pricing models sort after, unranked. | $0.015 per used vCPU-hour; $0.008 per used RAM GiB-hour; $0.0007 per used NVMe disk GiB-hour; $0.005-$0.012 per creation |
| Free while idle Whether a stopped, paused, or sleeping sandbox costs nothing. | ✓ |
| Elastic Resources flex with what the sandbox actually uses, and the bill follows: yes when the provider bills on active or observed use, no when capacity is reserved or allocated and billed while it runs. | ✓ |
| Memory snapshots Whether RAM state survives a pause and resume, not just disk. | ✓ |
| Wake on request Whether a stopped sandbox wakes automatically on inbound traffic. | ✓ |
| Start / resume Typical time from create or resume to running. Sorting ranks stated times, converted to seconds; claims with no figure sort after, unranked. | <3s |
| Max runtime The longest a sandbox may run. | No fixed limit |
| Isolation The isolation technology between sandboxes. | Kernel-isolated Linux VM (full VM, not microVM) |
| GPUs Whether GPU instances are available for sandboxes. | – |
| Docker Whether Docker containers can run inside the sandbox. | ✓ |
| SDKs | Python, TypeScript, Rust |
✓ yes · ✕ no · – no cited public fact.
Billing is based on observed/actual resource usage each second (not reserved capacity), which differs from Modal, E2B, or Vercel that bill on reserved allocations. Available sizes include 's' (1 vCPU) and 'm' (4 vCPU), with 's' marketed for fastest cold starts, forks, and resumes.
Sources
- https://www.sailresearch.com/sailboxes
- https://docs.sailresearch.com/reference/python-sdk
- https://docs.sailresearch.com/reference/typescript-sdk
- https://docs.sailresearch.com/reference/rust-sdk
- https://docs.sailresearch.com/sailboxes-lifecycle
- https://docs.sailresearch.com/sailboxes-images
- https://sailresearch.com/
- https://docs.sailresearch.com/sailboxes
- https://docs.sailresearch.com/pricing
- https://docs.sailresearch.com/sailboxes-pricing
- https://sailresearch.mintlify.app/sailboxes-pricing
- https://sailresearch.mintlify.app/sailboxes-networking
- https://www.sailresearch.com/blog/introducing-sailboxes-persistent-sandboxes
Last verified 2026-08-19. Corrections land through the update log.