Vellum AI alternatives

Originally an enterprise LLM development platform (prompts, workflows, evals). It pivoted to a personal AI assistant (open-source vellum-assistant plus Vellum Cloud). Full Vellum AI record →

  1. 1 Arize Phoenix Evaluation & observability platforms

    also in Evaluation & observability platforms

    OSS — Self-host ? Managed ? MCP ✓ ★ 12k released 2026-10-25 Elastic-2.0 Compare with Vellum AI →

  2. 2 Confident AI / DeepEval Evaluation & observability platforms

    also in Evaluation & observability platforms

    OSS ✓ Self-host ✓ Managed ✓ MCP ✓ ★ 19k released 2026-10-16 Apache-2.0 (DeepEval) Compare with Vellum AI →

  3. 3 Ragas Evaluation & observability platforms

    also in Evaluation & observability platforms

    OSS ✓ Self-host ✓ Managed ✓ MCP ? ★ 16k released 2026-01-13 Apache-2.0 Compare with Vellum AI →

  4. 4 OpenLLMetry (Traceloop) Evaluation & observability platforms

    also in Evaluation & observability platforms

    OSS ✓ Self-host ✓ Managed ✓ MCP ? ★ 7.5k released 2026-09-29 Apache-2.0 Compare with Vellum AI →

  5. 5 TruLens Evaluation & observability platforms

    also in Evaluation & observability platforms

    OSS ✓ Self-host ✓ Managed ✓ MCP ✓ ★ 3.6k released 2026-10-19 MIT Compare with Vellum AI →

  6. 6 Arize AI Evaluation & observability platforms

    also in Evaluation & observability platforms

    OSS — Self-host ✓ Managed ✓ MCP ✓ released 2026-10-26 proprietary; Python SDK Apache-2.0 Compare with Vellum AI →

  7. 7 Braintrust Evaluation & observability platforms

    also in Evaluation & observability platforms

    OSS — Self-host ✓ Managed ✓ MCP ✓ released 2026-10-26 proprietary; SDKs open source Compare with Vellum AI →

  8. 8 OpenInference Evaluation & observability platforms

    also in Evaluation & observability platforms

    OSS ✓ Self-host ✓ Managed ✓ MCP ? ★ 1.3k released 2026-10-23 Apache-2.0 Compare with Vellum AI →

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.