kitio.aiDia vs Sigma Browser
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Dia starts at $10/mo and Sigma Browser starts at $10/mo. Check both pricing pages for current plans.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Chat with tabs
- Skills
- Writing help
- Arc migration
- Chromium extensions
- Browser AI agent
- On-device Eclipse model
- Chat with page
- Deep research
- Image generation
- Built-in ad blocker
| Feature | Dia | Sigma Browser |
|---|---|---|
| Best for | AI browser from The Browser Company with chat across your tabs | Privacy-focused browser with an AI agent and an on-device model |
| Category | Productivity | Productivity |
| Pricing model | Freemium | Freemium |
| Starting price | $10/mo | $10/mo |
| Free plan | Yes | Yes |
| Made by | The Browser Company | Sigma |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Dia starts at $10/mo and Sigma Browser starts at $10/mo. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
3 plans
Free
Free
- Browser with no AI features
- Built-in ad and tracking blocker
- Cross-device sync
Better Answers
$10/mo
- Daily Morning Brief
- Ask Dia to summarize, draft or build
- Connect your tools
- Usage limits apply
Better Days
$100/mo
- Everything in Better Answers
- 20x more asks
- All-day chats, tasks and reports
3 plans
Free
Free
- AI chat on all platforms
- Text, image and file analysis
- Limited AI agent access
Plus
$10/mo
- Unlimited prompts
- Unlimited text writer
- 50x more file uploads
Pro
$75/mo
- Unlimited file uploads
- Unlimited web search
- Unlimited image generation
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Dia
- Thoughtful AI design
- Works across many tabs
- Easy move from Arc
- Free AI use is limited
- Fewer power features than Arc had
Sigma Browser
- Local model keeps prompts on device
- Agent completes tasks on web pages
- Free tier available
- Agent access limited on the free plan
- Pro plan costs $75/mo billed monthly
- No Android version listed
Which one should you choose?
Choose Dia if you want:
- Thoughtful AI design
- Works across many tabs
- Easy move from Arc
Watch out: free ai use is limited.
Choose Sigma Browser if you want:
- Local model keeps prompts on device
- Agent completes tasks on web pages
- Free tier available
Watch out: agent access limited on the free plan.
Dia vs Sigma Browser FAQ
What is the difference between Dia and Sigma Browser?
Dia: AI browser from The Browser Company with chat across your tabs. Sigma Browser: Privacy-focused browser with an AI agent and an on-device model. Both are productivity tools.
Is Dia or Sigma Browser cheaper?
Dia starts at $10/mo and Sigma Browser starts at $10/mo. Check both pricing pages for current plans.
Do Dia and Sigma Browser have free plans?
Dia: Yes. Sigma Browser: Yes.
Who makes Dia?
Dia is made by The Browser Company, based in United States.
Who makes Sigma Browser?
Sigma Browser is made by Sigma.
Which should I choose, Dia or Sigma Browser?
Choose Dia if you value thoughtful ai design and works across many tabs. Choose Sigma Browser if you value local model keeps prompts on device and agent completes tasks on web pages.