Modal Labs

license

Proprietary

source

closed

service

proprietary Modal managed cloud (no self-host of the gVisor execution plane)

open-part

client SDK only (modal Python/JS client libraries)

pricing

pay-as-you-go usage, free starter credits

Closed managed service. The client SDK is open, but the execution substrate is a proprietary managed cloud with no self-host; an open client over a closed runtime is not open_core. Corrects a prior mis-calibration that grouped Modal with the genuinely self-hostable E2B (E2B ships self-hostable infra; Modal does not).

• https://modal.com/pricing recorded 2026-06-04

  Modal is a managed proprietary cloud platform, pay-per-CPU-cycle, $30/mo free credits

• https://modal.com/docs/guide/sandbox recorded 2026-06-04

  Sandboxes = secure containers for untrusted agent code, driven via Modal SDK