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iGPT vs Onyx

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors.

The short answer

Entry price
iGPT from $20/mo, Onyx from $20/seat/mo — different billing units, so no direct winner
Free plan
Both have one
Public API
Both have one
Higher Trust score
Onyx — 91 vs 83 for iGPT
Best fit
iGPT: People whose real knowledge base is their inbox and shared drive · Onyx: IT teams that must keep documents and embeddings inside their own network

From our own records as of each tool's last check. Anything we have not confirmed is left out rather than guessed. How we verify

iGPTTurns your email, files and meetings into cited answers, through a chat app or a token-billed context APIOnyxOpen-source AI chat and search layer that connects any LLM to a company's apps, with permission-aware retrieval and self-hosting.

Side by side

FactiGPTOnyx
CategoryPersonal & Enterprise SearchEnterprise Search
Pricing modelFreemiumFreemium
Starts at$20/mo$20/seat/mo
Public APIYesYes
Trust score83 / 10091 / 100
PlatformsWeb, APIWeb, Chrome extension, Slack app, API
CompanyiGPTZoom
Launched—2023
Last verifiedSep 6, 2026Oct 2, 2026

What our research says

iGPT

The interesting part is not the chat box but the plumbing under it — deduplicating quoted email text and attributing speakers across thread formats is fiddly work most 'chat with your inbox' tools skip. Selling that same layer as a token-billed API is unusual and genuinely useful if you are building on top. The unknown is the vendor itself: no company name, no address, no country.

Pros

  • Rebuilds email threads with quoted-text deduplication and participant attribution
  • Combines private context with live web data in a single cited answer
  • Developer API priced per token with no setup fee or commitment
  • States that customer email, documents and chat history are not used for model training

Cons

  • No legal entity, address or country disclosed anywhere on the site
  • Team carries a three-seat minimum, so the practical entry is $90/month
  • Token-billed API makes costs hard to forecast in advance

Onyx

Onyx fits teams that want a ChatGPT-style workspace over their own documents without sending the index to a vendor cloud. The free community edition covers chat, connectors and agents; SSO and role-based access sit behind the paid tiers. The Zoom deal is new, so check how the self-hosted and open-source promises are written into your contract.

Pros

  • Permission-aware retrieval inherits access rules from each connected source
  • Runs self-hosted, including air-gapped, with a free MIT-licensed community edition
  • Works with many LLM providers, including local models
  • Connects to 40+ apps and exposes agents, MCP tools and developer APIs

Cons

  • SSO, role-based access and white-labeling require a paid or enterprise licence; the repository carries a separate enterprise licence for those directories
  • Self-hosting a search index and connectors needs real infrastructure and upkeep
  • Product roadmap now depends on a new parent company, and pricing for larger deployments is not published

Which one fits

Choose iGPT if you need

  • People whose real knowledge base is their inbox and shared drive
  • Developers who want parsed email and work-app context as an API rather than writing the parsers
  • Teams that want answers traceable back to the original thread

Choose Onyx if you need

  • IT teams that must keep documents and embeddings inside their own network
  • Companies that want one chat and search interface across Slack, Drive, Confluence and GitHub
  • Teams that want to swap LLM providers without changing the interface

iGPT vs Onyx: the questions people ask

Is iGPT cheaper than Onyx?

They charge in different units, so there is no like-for-like answer: iGPT starts at $20/mo, Onyx at $20/seat/mo. Entry price is the lowest paid plan as we last verified it.

Does iGPT or Onyx have a free tier?

Both: iGPT has a free tier, and Onyx has a free tier.

Which has a public API, iGPT or Onyx?

Both ship a public API, so either can be built on; the fact table above shows the platforms each one runs on.

More comparisons

All iGPT alternatives →Browse all Personal & Enterprise Search →