Microsoft Copilot vs Dia
Which is better in 2026? Five scores, side by side.
It's close: Microsoft Copilot edges it 8.2 to 8.1, so the right pick depends on what you need. Microsoft Copilot wins on 3 of the 5 scores, Dia on 2.
Microsoft 365 subscribers who want AI help inside Word, Excel and Outlook
Office workers who juggle email, docs and meetings in the browser
Score by score
The details
| Feature | Microsoft Copilot | Dia |
|---|---|---|
| Category | AI Assistants | AI Assistants |
| Category rank | #11 of 16 | #12 of 16 |
| Developer | Microsoft | The Browser Company |
| Pricing | Free + paid plans | Free + paid plans |
| Usable for free | Yes | Yes |
| iPhone & iPad | ✓ | — |
| Android | ✓ | — |
| Mac | ✓ | ✓ |
| Windows | ✓ | ✓ |
| Web | ✓ | — |
Common questions
Is Microsoft Copilot better than Dia?
It's close: Microsoft Copilot edges it 8.2 to 8.1, so the right pick depends on what you need. Microsoft Copilot wins on 3 of the 5 scores, Dia on 2.
Which is cheaper, Microsoft Copilot or Dia?
Microsoft Copilot: Free; Microsoft 365 Personal at $9.99/month adds Copilot in Office apps. Dia: Free browser has no AI; Better Answers is $10 a month and Better Days $100. On value for money, Microsoft Copilot scores higher.
Do Microsoft Copilot and Dia work on the same devices?
Only Microsoft Copilot runs on iPhone & iPad, Android, Web.
Which is more private, Microsoft Copilot or Dia?
Dia scores higher on privacy (8.2/10). History, chats and files are encrypted on your device, and Sync is end-to-end encrypted. AI partners can't train on your data. Dia keeps some unlinked content 30 days to improve itself unless you opt out.
Strengths and weaknesses
Microsoft Copilot
- Free to use, even without signing in
- Works inside Word, Excel and Outlook with Microsoft 365
- Jump from a chat straight into your Office files
- Shows ads and uses IDs to track you
- Several consumer features were cut in 2026
- Built mostly for Microsoft 365 and work
Microsoft Copilot is now one app for both your personal and work accounts. You get free AI chat with voice and image making. With a Microsoft 365 plan, it works inside Word, Excel, PowerPoint and Outlook. But the August 2026 merger tilted it toward work. It also cut consumer features like Deep Research, Podcasts and group chats. And it shows ads. Best for people who already pay for Microsoft 365.
Full Microsoft Copilot review
Dia
- Calm, uncluttered design from the makers of Arc
- Data is stored and encrypted on your device
- AI partners are barred from training on your data
- New users' free plan has no AI features
- Better Days plan costs $100 a month
- Windows version is still an early build
Dia comes from the team behind Arc and puts an AI chat beside your tabs that can read what's open and pull in context from Slack, Notion and Teams. Its Morning Brief, meeting prep and deck building are aimed squarely at office work. Privacy is better than most AI browsers, with your data stored on your device. Since August 2026, though, new users get no AI on the free plan, and the Windows version is still young.
Full Dia review
