SandBase Harness alternatives

A local-first, self-hosted runtime for persistent AI-agent sessions, sandboxed execution, MCP tools, approvals, audit, and replay. **Claims / pitch:** The public repository documents local, Docker, and Kubernetes sandbox backends; persistent sessions and… Full SandBase Harness record →

  1. 1 e2b AI sandbox & runtime environments

    also in AI sandbox & runtime environments · also open source · also self-hostable · also offered managed · also has MCP

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

  2. 2 Coder.com AI sandbox & runtime environments

    also in AI sandbox & runtime environments · also open source · also self-hostable · also offered managed · also has MCP

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

  3. 3 Modal Sandboxes AI sandbox & runtime environments

    also in AI sandbox & runtime environments · also open source · also self-hostable · also offered managed

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

  4. 4 Daytona AI sandbox & runtime environments

    also in AI sandbox & runtime environments · also open source · also self-hostable · also offered managed · also has MCP

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

  5. 5 Browserless.io AI sandbox & runtime environments

    also in AI sandbox & runtime environments · also self-hostable · also offered managed · also has MCP

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

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

    also in AI sandbox & runtime environments · also offered managed · also has MCP

    OSS ? Self-host — Managed ✓ MCP ✓ Compare with SandBase Harness →

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

    also in AI sandbox & runtime environments · also offered managed · also has MCP

    OSS ? Self-host — Managed ✓ MCP ✓ Compare with SandBase Harness →

  8. 8 StackBlitz WebContainers AI sandbox & runtime environments ⚠ stale — no commits since 2025-04

    also in AI sandbox & runtime environments · also offered managed

    OSS ? Self-host — Managed ✓ MCP ? ★ 4.7k released 2026-04-14 Compare with SandBase Harness →

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.