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Opik vs Plandex

OpikPlandex

Bottom line: Opik for teams wanting open-source eval plus tracing; Plandex for developers on large codebases.

OpikOpik

Open-source LLM evaluation, tracing, and observability by Comet.

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PlandexPlandex

Open-source terminal AI coding agent built for large, multi-file projects

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Votes00
PricingFreemiumFreemium
CategoryLlm ObservabilityCoding
Tags
llm-evaluationobservabilityopen-sourcetracingmonitoring
ai-coding-agentopen-sourceterminalclilarge-codebase
Best for
  • Teams wanting open-source eval plus tracing
  • LLM engineers doing eval-driven development
  • Organizations that value self-hostability
  • Developers on large codebases
  • Terminal-first engineers
  • Teams wanting reviewable AI edits
Pros
  • Full platform is Apache-2.0 and free to self-host
  • Combines tracing and evaluation in one tool
  • LLM-as-a-judge and many automated metrics
  • Fast-growing, widely adopted open-source project
  • Integrates with Comet's ML ecosystem
  • Purpose-built for large, multi-file tasks
  • Cumulative diff sandbox keeps changes reviewable
  • Very large context via tree-sitter project maps
  • Model-agnostic across major and open providers
  • MIT-licensed and free to self-host
Cons
  • Crowded, competitive category
  • Self-hosting requires running infrastructure
  • Managed cloud limits (spans, seats) on lower tiers
  • Evaluation quality depends on judge configuration
  • Deep value tied to adopting the workflow
  • Terminal-only — no GUI or IDE integration
  • Hosted cloud service is being wound down in 2026
  • Requires bringing your own model API keys
  • Smaller ecosystem than IDE-based competitors
  • Learning curve for the plan/review workflow

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