# Free tools

Free tools for cloud sandboxes for AI agents. You need no account.

- [Sandbox cost estimator](https://agentsandboxes.fyi/tools/sandbox-cost-estimator.md): Estimate a monthly sandbox compute bill from runs, seconds, vCPU, GiB and the provider's published rates.
- [Compare sandboxes](https://agentsandboxes.fyi/tools/compare-sandboxes.md): Compare two or three sandbox providers side by side: isolation, cold start, persistence and price.

> **Check before you choose.** Vendor specs and prices change. Follow the cited source on each listing before you pick a provider.