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Microsoft 365 Copilot vs WRITER

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

Free plan
Neither — Microsoft 365 Copilot has paid plans only, WRITER has paid plans only
Public API
Both have one
Higher Trust score
Microsoft 365 Copilot — 90 vs 80 for WRITER
Best fit
Microsoft 365 Copilot: Knowledge workers in a Microsoft 365 tenant who spend their day in Teams meetings, long email threads and shared documents · WRITER: Enterprise marketing teams automating content and campaign workflows under brand rules
Platforms
Microsoft 365 Copilot: Web, Windows, macOS, iOS, Android · WRITER: Web

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

Microsoft 365 CopilotAssistant inside Word, Excel, Outlook and TeamsWRITEREnterprise agent platform where teams build and run multi-step playbooks grounded in company knowledge, brand voice and governance.

Side by side

FactMicrosoft 365 CopilotWRITER
CategoryDocument Editing & Office SuitesAI Agents & Autonomous Workers
Pricing modelPaidPaid
Starts at$18/seat/mo—
Public APIYesYes
Trust score90 / 10080 / 100
PlatformsWeb, Windows, macOS, iOS, Android, APIWeb, API
CompanyMicrosoftWriter, Inc.
Launched—2020
Last verifiedOct 15, 2026Oct 29, 2026

What our research says

Microsoft 365 Copilot

For a company that lives in Outlook, Teams and SharePoint there is no competing assistant with the same reach into its own data, and the free Copilot Chat tier means every tenant can try the web-grounded version for nothing. The paid add-on is worth it for the people who draft, summarise and search across the tenant all day; it is wasted on seats that mostly read email, and the Business edition's $18 headline is a first-year promotion against a $21 list price.

Pros

  • Grounds answers in the user's own mail, files, meetings and chats with existing permissions respected
  • Free Copilot Chat with web grounding ships with eligible plans, so evaluation costs nothing
  • Business edition and bundles bring the price well under the $30 enterprise add-on for smaller companies
  • Enterprise data protection, EU data boundary and admin usage reports come as standard

Cons

  • Requires a qualifying Microsoft 365 licence on top, so the true cost is add-on plus base seat
  • Yearly commitment on the discounted prices; month-to-month is 20 to 40% dearer
  • Cowork and Code agents are usage-billed credits beyond the licence, and the credit rates are not on the pricing page
  • Product naming keeps shifting — the app is now called Microsoft Copilot, the licence Microsoft 365 Copilot — which confuses procurement and training

WRITER

WRITER is built for large marketing, sales and support organisations that want governed AI agents tied to their own data and brand rules, with admin controls that security teams expect. Individuals and small businesses looking for an inexpensive writing assistant will find it oversized and hard to price without talking to sales.

Pros

  • Governance features such as audit logs, guardrails and role-based access
  • Knowledge Graph and connectors ground outputs in company data
  • Own Palmyra models with the option to use other LLMs
  • 14-day free trial of Starter without a credit card

Cons

  • No published price for any plan
  • Starter is capped at 5 users, 5 Playbooks and 3 active connectors
  • Most advanced orchestration and connectors are Enterprise-only

Which one fits

Choose Microsoft 365 Copilot if you need

  • Knowledge workers in a Microsoft 365 tenant who spend their day in Teams meetings, long email threads and shared documents
  • IT teams that want one assistant with enterprise data protection, Purview labels and audit logs already wired in
  • Small businesses under 300 seats, where the Business edition and bundles cut the price below the enterprise add-on

Choose WRITER if you need

  • Enterprise marketing teams automating content and campaign workflows under brand rules
  • Regulated companies that need audit logs, SSO and HIPAA or SOC 2 paperwork
  • Organisations that want agents grounded in internal knowledge via a managed graph

Microsoft 365 Copilot vs WRITER: the questions people ask

Is Microsoft 365 Copilot cheaper than WRITER?

Microsoft 365 Copilot starts at $18/seat/mo. An entry price for WRITER is not confirmed by us yet, so check its pricing page before you compare.

Which has a public API, Microsoft 365 Copilot or WRITER?

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

More comparisons

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