Onyx
coding
Open-source AI chat and enterprise search over your company's knowledge.
Pricing
Free plan
Rating
—
Votes
0
Head-to-head comparison
Onyx vs Plandex
Compare Onyx and Plandex side by side across pricing, features, ratings, pros, cons, best-fit use cases, and alternatives.
Plandex
coding
Open-source terminal AI coding agent built for large, multi-file projects
Pricing
Free plan
Rating
—
Votes
0
Feature comparison
Feature
Onyx
Plandex
Category
coding
coding
Pricing
Free plan
Free plan
Free plan
API access
Mobile app
Browser extension
Team collaboration
Custom training
Self-hosted option
Offline mode
Multi-language support
Onyx pros and cons
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
Self-hosting requires engineering effort to deploy and maintain
Less polished onboarding than turnkey SaaS
No native mobile app
Plandex pros and cons
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
Terminal-only — no GUI or IDE integration
Hosted cloud service is being wound down in 2026
Requires bringing your own model API keys
Which one should you choose?
Best overall signal
Onyx
Selected using Toolglade popularity signals such as views and votes.
Best value signal
Onyx
Selected using free-plan availability and engagement signals.
Best for
Onyx
- self-hosted enterprise search
- internal knowledge assistants
- data-sovereignty use cases
- open-source AI deployments
- Engineering-capable teams
Plandex
- large multi-file coding tasks
- terminal-centric workflows
- reviewable AI changes
- Developers on large codebases
- Terminal-first engineers
FAQ
Is Onyx better than Plandex?
It depends on your use case. Compare category fit, pricing, feature availability, and ratings before choosing.
Which tool has a free plan?
Onyx and Plandex offer a free plan based on current Toolglade data.