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AI Agents for Online Office Editors: Excel Copilot vs Gemini vs ONLYOFFICE vs ArtCraftAI

Oct 16, 2026ArtCraft AI Online

A fair comparison of AI that edits the open spreadsheet or document — Microsoft Excel Copilot, Google Gemini in Sheets, ONLYOFFICE AI Agent, Gamma, and ArtCraft AI Copilot.

What counts as an AI agent in an editor?

For this article, an AI agent can:

  1. See context from the currently open workbook/document/deck.
  2. Propose tool calls that change that file (or clearly say it cannot).
  3. Let a human review or confirm before or after mutation when the product supports it.

A chatbot that only returns advice you paste yourself is useful — but it is not the same product category.

AI that answers vs AI that changes the file

| Mode | Typical output | File changes | | --- | --- | --- | | Q&A / formula advice | Text in a side chat | Manual copy/paste | | In-editor agent | Commands / structured edits | Directly on the open file (with product-specific gates) |

Microsoft Excel Copilot

Microsoft documents getting started with Copilot in Excel as part of the Microsoft 365 Copilot experience. Expect eligibility tied to Microsoft’s Copilot / Microsoft 365 plans (verify current SKU requirements on Microsoft’s site — they change). Strengths: deep Excel ecosystem, enterprise admin controls. Tradeoff: you are inside Microsoft’s cloud and licensing stack.

Sources accessed: Microsoft Support Excel Copilot docs (2026-10-16). Confirm live plan eligibility before purchasing.

Google Gemini in Sheets

Google documents Gemini features for Docs/Sheets (see Google Help for Gemini in Docs/Sheets and related answers). Strengths: tight Google Workspace integration. Tradeoff: availability and plan requirements follow Google Workspace / Gemini for Workspace packaging — check Google’s current admin docs rather than third-party blogs.

Sources: Google Docs Editors Help (2026-10-16).

ONLYOFFICE AI Agent

ONLYOFFICE documents an AI inline agent and API AI agent guides. Positioning often includes configurable providers / deployment choices depending on edition. Strengths: document suite focus and self-host options in some deployments. Tradeoff: feature set depends on which ONLYOFFICE edition and AI configuration you run.

Sources: ONLYOFFICE Help Center / API docs (2026-10-16).

Gamma (presentations — different category)

Gamma Agent helps create presentations in Gamma’s generative product. That is not the same as “PPTX editor with agent commands on an open Office file.” Include Gamma when buyers want generative decks; do not score it as a failed Excel clone.

ArtCraft AI Online — verified today

ArtCraft hosts browser Craft editors (GridCraft / WordCraft / DeckCraft WASM) with a shared AI Copilot panel:

| Capability | GridCraft | WordCraft | DeckCraft | | --- | --- | --- | --- | | Open/edit/export primary format | XLSX/CSV (tested paths) | DOCX (Alpha) | PPTX (Alpha) | | AI Copilot beside the editor | Yes (Pro) | Yes (Pro) | Yes (Pro) | | Tools on open file | inspect / read / execute / undo | inspect / execute / undo | inspect / execute / undo | | Confirm mutating steps | Yes in Copilot UI | Yes | Yes | | Core editing free | Yes | Yes | Yes |

We do not claim ArtCraft is “better than Excel Copilot.” We claim a fit for users who want:

  • Browser open-source-style Craft editors without desktop install.
  • An integrated AI Copilot (no per-user BYO key required for the hosted product).
  • Reviewable tool calls on the file already open.

Comparison snapshot (honest)

| Dimension | Excel Copilot | Gemini in Sheets | ONLYOFFICE AI | ArtCraft AI Copilot | | --- | --- | --- | --- | --- | | Edits open file | Yes (Microsoft docs) | Yes (Google docs) | Yes (ONLYOFFICE docs) | Yes for supported commands | | Plan model | Microsoft 365 Copilot eligibility | Google Workspace / Gemini packaging | Edition + AI config | Craft editing free; Copilot on Pro | | Primary habitat | Excel / M365 | Google Sheets | ONLYOFFICE editors | Browser Craft WASM apps | | Best when | You already live in M365 | You already live in Workspace | You run ONLYOFFICE | You want browser Craft + Copilot |

Best-fit recommendations

  • Enterprise Excel tenants → start with Microsoft’s Copilot docs.
  • Google Workspace teams → start with Gemini in Sheets.
  • Self-hosted ONLYOFFICE → evaluate ONLYOFFICE AI Agent configuration.
  • Browser Craft suite / no desktop Office → try GridCraft, WordCraft, DeckCraft.

Related guides

Updated: 2026-10-16. Re-check competitor plan pages before citing prices.