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Head to head · 2026

iGPT vs Onyx

Pricing, free plans, ratings, features, pros and cons, side by side. Where one comes out ahead, we mark it.

iGPT

Rebuilds a full email thread from scattered messages and cites its sources back to them

3.6Free

Visit iGPT (opens iGPT in a new tab)

Onyx

Open-source AI chat and enterprise search that connects to a team's documents, apps, and people

4.2$20/mo

Visit Onyx (opens Onyx in a new tab)

Who comes out ahead

Based only on the facts in our directory. The right pick still depends on the job you need done.

  • Lower starting price

    Not comparable

    Not comparable: iGPT does not list a price

  • Free plan

    Tie

    Both have one

  • Higher rating

    Onyx

    3.6 against 4.2

  • Same job?

    Yes

    Both are Productivity tools

Side by side

Compared oniGPTOnyx
Our rating3.64.2Better
Starts atFree$20/mo
Free planYesYes
CategoryProductivityProductivity
PlansFreeFrom $20/mo
Key features
  • Real-time email and attachment indexing
  • Automatic thread reconstruction from scattered messages
  • Hybrid semantic, keyword and filter retrieval
  • Cited responses linking back to source emails
  • Cloud, hybrid or fully private deployment with RBAC
  • Hybrid search plus RAG chat over 40+ connected workplace applications
  • Self-hosted, MIT-licensed open-source core with full data control
  • MCP support for connecting external tools and agent workflows
  • Custom AI assistants configurable per team or use case
  • Deep research mode with built-in code interpreter and web search
Pros
  • Cites responses back to the source email, not an unattributed summary
  • Thread reconstruction solves a genuine, specific email annoyance
  • Fully private deployment available for sensitive inboxes
  • Free, license-unrestricted self-hosted option for teams that want to avoid sending data to a vendor
  • Broad connector library covers most common workplace tools out of the box
  • MCP support keeps the platform current with the wider agent-tooling ecosystem
Cons
  • Indexes an organisation's most sensitive material by definition
  • Deployment model choice matters more here than in most categories
  • No subscription pricing published beyond playground credits
  • Self-hosting the open-source edition still requires infrastructure and maintenance effort
  • The 2024 rebrand from Danswer to Onyx means older tutorials and integrations still reference the old name
  • Per-seat Business pricing can add up for larger teams compared with a flat-rate tool
CompanyiGPTDanswerAI Inc. (operating as Onyx), founded 2023

Prices come from each vendor's pricing page, last checked 20260824. Check the vendor before you buy.

FAQ

Questions people ask

Is iGPT better than Onyx?

In our reviews iGPT scores 3.6 and Onyx scores 4.2. The better pick depends on the job. iGPT: Rebuilds a full email thread from scattered messages and cites its sources back to them. Onyx: Open-source AI chat and enterprise search that connects to a team's documents, apps, and people.

Which is cheaper, iGPT or Onyx?

iGPT: free. Onyx: from $20/mo.

Do iGPT and Onyx have free plans?

Yes, both have a free plan.

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