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Plandex vs Onyx

PlandexOnyx

Bottom line: Plandex for developers on large codebases; Onyx for engineering-capable teams.

PlandexPlandex

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

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OnyxOnyx

Open-source AI chat and enterprise search over your company's knowledge.

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Votes00
PricingFreemiumFreemium
CategoryCodingCoding
Tags
ai-coding-agentopen-sourceterminalclilarge-codebase
open-sourceenterprise-searchragself-hostedai-assistant
Best for
  • Developers on large codebases
  • Terminal-first engineers
  • Teams wanting reviewable AI edits
  • Engineering-capable teams
  • Security and privacy-focused organizations
  • Companies avoiding vendor lock-in
Pros
  • 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
  • Open-source and MIT-licensed with free self-hosting
  • 40+ connectors to common workplace apps
  • Model-agnostic, works with any LLM
  • Granular access controls and data residency
  • Active GitHub community and rapid development
Cons
  • 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
  • Self-hosting requires engineering effort to deploy and maintain
  • Less polished onboarding than turnkey SaaS
  • No native mobile app
  • Advanced/enterprise features may need the paid tier
  • Support for self-hosters is community-driven

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