ToolRankBest AI tools that work in Microsoft Word
Updated 24 Oct 2026 · Prices from vendor pages only · How we rank →
The short answer
Each of these tools works inside Microsoft Word or Office, or exports to it. Microsoft Copilot comes first: built into Microsoft's apps and available free for consumers, with business plans bundled with Microsoft 365. The cheapest verified paid plan here is ProWritingAid Premium ($10/month yearly ($120) or $30 monthly). 3 of the 5 have a free plan we could confirm. Every price below is from the vendor’s own page, checked 16–23 Oct 2026.
Ranked shortlist
- Microsoft Copilot: Built into Microsoft's apps and available free for consumers, with business plans bundled with Microsoft 365. Plan: Microsoft 365 Copilot Business: $18/user/month paid yearly (shown as reduced from $21)
- ProWritingAid: Grammar and style checker aimed at fiction writers. Plan: Premium: $10/month yearly ($120) or $30 monthly
Unlimited line editing reports - LanguageTool: A free Basic plan, 30+ languages and team style guides and dictionaries. Plan: Not yet verified
- Microsoft 365 Copilot: Copilot works directly inside the Microsoft 365 apps most businesses already use. Plan: Copilot Business: $18/user/month paid yearly
- Diffit: A free Basic plan for teachers plus an individual Premium plan with exports. Plan: Individual teacher: $14.99/month billed monthly or $149.99/year billed annually
Save 16% yearly; exports and standards alignment
Tools come from several ToolRank categories, so they are grouped by category and then by each category’s editorial rank. Anything we couldn’t confirm on a vendor page says “Not yet verified”.
Side by side
| Rank | Tool | Relevant plan | Starting price | Free plan | Best for | Main limitation | Last checked |
|---|---|---|---|---|---|---|---|
| #1 | Microsoft Copilot | Microsoft 365 Copilot Business: $18/user/month paid yearly (shown as reduced from $21) | $18/user/month (Copilot Business, paid yearly) | Not yet verified | People and teams living in Word, Excel, Outlook and Teams | Business Copilot pricing is per user and tied to Microsoft 365 annual subscriptions. | 16 Oct 2026 |
| #2 | ProWritingAid | Premium: $10/month yearly ($120) or $30 monthly Unlimited line editing reports | $10/month (Premium, billed yearly $120; $30 monthly) | Free plan with core editing tools | Fiction and long-form writers who want manuscript-level editing reports | Monthly billing costs roughly three times the yearly rate | 18 Oct 2026 |
| #3 | LanguageTool | Not yet verified | Not yet verified | Basic: free, 2,000 characters per text field, 3 AI rephrasings a day | Multilingual writers and teams who want one checker across browser and desktop | Basic caps text at 2,000 characters per field and 3 AI rephrasings a day; prices not shown | 23 Oct 2026 |
| #4 | Microsoft 365 Copilot | Copilot Business: $18/user/month paid yearly | $18/user/month paid yearly (Copilot Business) | ✕ None listed | Microsoft 365 organisations | Per-user, annual-commitment pricing on top of Microsoft 365. | 16 Oct 2026 |
| #5 | Diffit | Individual teacher: $14.99/month billed monthly or $149.99/year billed annually Save 16% yearly; exports and standards alignment | $14.99/month | Basic: free (PDF download, print, share; last 90 days of resources) | Teachers who need the same content at several reading levels (ELL, SPED, intervention) | Exports to Google, Microsoft and Canva need Premium or a school licence | 20 Oct 2026 |
Prices as listed by each vendor on the last-checked date, USD, before tax. Plans and limits change, so follow the sources below.
Who should pick which
Pick Microsoft Copilot for people and teams living in Word, Excel, Outlook and Teams (Microsoft 365 Copilot Business: $18/user/month paid yearly (shown as reduced from $21)); think twice if you don't use Microsoft 365. Pick ProWritingAid for fiction and long-form writers who want manuscript-level editing reports (Premium: $10/month yearly ($120) or $30 monthly). Watch out: monthly billing costs roughly three times the yearly rate. Pick LanguageTool for multilingual writers and teams who want one checker across browser and desktop (free plan: Basic: free, 2,000 characters per text field, 3 AI rephrasings a day). Watch out: basic caps text at 2,000 characters per field and 3 AI rephrasings a day; prices not shown. Pick Microsoft 365 Copilot for microsoft 365 organisations (Copilot Business: $18/user/month paid yearly); think twice if your team runs on Google Workspace. Pick Diffit for teachers who need the same content at several reading levels (ELL, SPED, intervention) (Individual teacher: $14.99/month billed monthly or $149.99/year billed annually). Watch out: exports to Google, Microsoft and Canva need Premium or a school licence.
FAQ
Which of these is cheapest?
ProWritingAid Premium ($10/month yearly ($120) or $30 monthly) is the lowest paid price we verified on this list (https://prowritingaid.com/pricing, checked 18 Oct 2026). Check the vendor page for tax, billing period and usage limits.
Which of these have a free plan?
ProWritingAid: Free plan with core editing tools; LanguageTool: Basic: free, 2,000 characters per text field, 3 AI rephrasings a day; Diffit: Basic: free (PDF download, print, share; last 90 days of resources).
How were these tools chosen?
They are the tools in ToolRank's rankings with Microsoft Word or Office listed by the vendor, confirmed on the vendor's own website on 16–23 Oct 2026. Tools we could not verify are left out rather than guessed, and anything unconfirmed is marked Not yet verified.
Sources
- Microsoft Copilot: Microsoft 365 Copilot pricing checked 16 Oct 2026
- ProWritingAid: ProWritingAid pricing checked 18 Oct 2026
- LanguageTool: LanguageTool Premium and Teams checked 23 Oct 2026
- Microsoft 365 Copilot: Microsoft 365 Copilot business checked 16 Oct 2026
- Diffit: Diffit pricing checked 20 Oct 2026
- Diffit: Diffit individual teacher subscription checked 20 Oct 2026
Related comparisons
Profiles: Microsoft Copilot · ProWritingAid · LanguageTool · Microsoft 365 Copilot · Diffit
More best-of lists
- Best AI grammar checkers and editors
- Best AI writing tools for $10 a month or less
- AI writing tools that are cheaper billed yearly
- Best AI writing tools with desktop apps
- Best free AI writing tools (with a real free plan)
- Best paid AI writing tools (no free plan)
- Best AI writing tools for $15 a month or less
- Best AI writing tools for teams (per-seat plans)
- Best AI tools that work in Google Docs
- Best AI tools for Microsoft Teams users
- Best AI tools for Google Workspace users
- Best AI assistants built into office suites
- Full Writing & Content ranking →
Some links may be affiliate links. They never affect rank.
Get the weekly ToolRank brief
New AI tools, verified price changes and fresh comparisons. One email a week. Unsubscribe anytime.