A agentindex
Comparison

Fiddler vs Helicone

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

Helicone

Proxy-based LLM observability with instant cost tracking.

  • + Fastest setup via a drop-in proxy
  • + Automatic cost and rate-limit tracking
  • − Eval features lighter than competitors
  • − Proxy model adds a hop
Spec Fiddler Helicone
Role Observability Observability
Tags observability, guardrails, persona-platform-engineer observability, llm-gateway, persona-platform-engineer
License Proprietary Apache-2.0
Open source No Yes
Self-hostable No Yes
MCP support No No
Pricing paid freemium
Price Custom Free tier
Usage cost No model cost No model cost
Models multi multi
Languages python typescript
GitHub stars — 5.9k
Last activity — 2026-06-11