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Onyx vs Retell AI

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Onyx compared with Retell AI
DetailOnyxRetell AI
What it doesOpen source enterprise search and AI assistant platform AI Voice Agent Platform for Phone Call Automation
StageGrowing Established
FoundedNot given Not given
Based inNot given Not given
Pricing modelfreemium usage-based
PricingFree open-source self-hosting available. Managed cloud Business plan: $20/user/month (annual) or $25/user/month (monthly). Enterprise plan with custom pricing, on-premise deployments, OIDC/SAML SSO, white-labeling, and dedicated support. $0.07-$0.31 per minute for voice agents, $0.002+ per message for chat agents, with $10 free credits at signup and no annual contract.
Key features
  • Chat and search UI
  • Access to all major LLMs
  • Custom AI agents
  • MCP and OpenAPI actions
  • 40+ app connectors
  • Web search and deep research
  • Code interpreter
  • Slack integration
  • Developer APIs
  • Permission-aware connectors
  • Call transfer between human and AI
  • Book appointments and check availability
  • Knowledge base integration
  • Navigate IVR and handle keypad menus
  • Batch call campaigns and outbound dialing
  • Post-call analysis and transcripts
  • AI quality assurance monitoring
  • Drag-and-drop call flow builder
  • Simulation testing and regression testing
What makes it different
  • Searches all sources in parallel for faster answers
  • Self-hosted with data never leaving customer infrastructure
  • Permission-aware from day one with real-time sync
  • Supports any LLM provider with one-click switching
  • State-of-the-art search outperforming industry leaders
  • 95.7% workflow accuracy benchmarked ahead of 6 platforms
  • ~600ms latency with industry-leading responsiveness
  • Proprietary turn-taking model that knows when to stop and listen
  • Full platform access with no feature gating from day one
  • Production-ready no-code agent builder your team can operate
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)62 no change since last check77 no change since last check
Trust Flow (Majestic)2931
Citation Flow (Majestic)5052
Referring domains (Majestic)16863856

6 details filled in for both companies.

More alternatives to Onyx More alternatives to Retell AI

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