A agentindex
Comparison

Fiddler vs SigNoz

A like-for-like, spec-level comparison. Both entries are verified against their docs and repo.

Fiddler

AI observability and governance for enterprise.

  • + Strong governance and compliance story
  • + Good for regulated enterprise
  • − Enterprise-priced
  • − Heavier than dev-focused tools

SigNoz

Open-source OpenTelemetry observability.

  • + Unified app and LLM tracing on OTel
  • + Fully self-hosted, no vendor lock-in
  • − LLM evals via OpenLLMetry, not native
  • − More ops to run than a SaaS
Spec Fiddler SigNoz
Category eval-observability eval-observability
License Proprietary MIT
Open source No Yes
Self-hostable No Yes
MCP support No No
Pricing paid freemium
Starting price Custom (enterprise) Self-host free
Models multi multi
Languages python go, typescript
GitHub stars — 27.5k
Last activity — 2026-06-25