StackBlitz WebContainers alternatives

StackBlitz's WebContainers technology — browser-native Node.js runtime running fully client-side via WASM. Powers Bolt.new (already in catalog) plus many browser-based AI dev experiences. Founded 2017 by Eric Simons + Albert Pai. $7M Series A 2022. Full StackBlitz WebContainers record →

  1. 1 e2b AI sandbox & runtime environments

    also in AI sandbox & runtime environments · same memory unit (file) · also offered managed

    OSS ✓ Self-host ✓ Managed ✓ MCP ✓ ★ 15k released 2026-10-26 Apache-2.0 Compare with StackBlitz WebContainers →

  2. 2 Modal Sandboxes AI sandbox & runtime environments

    also in AI sandbox & runtime environments · same memory unit (file) · also offered managed

    OSS ✓ Self-host ✓ Managed ✓ MCP ? ★ 530 released 2026-10-16 Apache-2.0 (client SDK only; platform… Compare with StackBlitz WebContainers →

  3. 3 Coder.com AI sandbox & runtime environments

    also in AI sandbox & runtime environments · same memory unit (file) · also offered managed

    OSS ✓ Self-host ✓ Managed ✓ MCP ✓ ★ 14k released 2026-10-06 AGPL-3.0 (Community); proprietary Premium / AI… Compare with StackBlitz WebContainers →

  4. 4 Browserless.io AI sandbox & runtime environments

    also in AI sandbox & runtime environments · same memory unit (file) · also offered managed

    OSS — Self-host ✓ Managed ✓ MCP ✓ ★ 14k SSPL-1.0 + Browserless Commercial License… Compare with StackBlitz WebContainers →

  5. 5 Daytona AI sandbox & runtime environments

    also in AI sandbox & runtime environments · same memory unit (file) · also offered managed

    OSS ✓ Self-host ✓ Managed ✓ MCP ✓ ★ 15 released 2026-10-23 Apache-2.0 (SDKs in daytona/clients; CLI under… Compare with StackBlitz WebContainers →

  6. 6 Workato AI (Workflow Bot Builder) AI sandbox & runtime environments

    also in AI sandbox & runtime environments · same memory unit (file) · also offered managed

    OSS ? Self-host — Managed ✓ MCP ✓ Compare with StackBlitz WebContainers →

  7. 7 Anchor (Anchor Browser) AI sandbox & runtime environments

    also in AI sandbox & runtime environments · same memory unit (file) · also offered managed

    OSS ? Self-host — Managed ✓ MCP ✓ Compare with StackBlitz WebContainers →

  8. 8 CodeSandbox AI AI sandbox & runtime environments ⚠ acquired — acquired by Together AI

    also in AI sandbox & runtime environments · same memory unit (file) · also offered managed

    OSS ? Self-host — Managed ✓ MCP ? Compare with StackBlitz WebContainers →

Ranked by shared memory design (storage, retrieval, conflict handling, memory unit), same section and shared must-haves (open source, self-hosting, MCP), with adoption as a tie-breaker. ✓ confirmed · — no · ? not in the catalog yet. Want picks for your own requirements? Use the chooser. Checking a whole project? Check your stack.