kitio.aiSigmaOS vs Side Copilot
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. SigmaOS starts at See pricing page and Side Copilot starts at $4.90/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
- Workspaces
- Vertical tabs
- Tabs as tasks
- Split screen
- Lazy Search
- Airis AI companion
- Chat with open tabs
- Browser agent mode
- Vertical tab sidebar
- Spaces with cloud sync
- Bring your own AI key
| Feature | SigmaOS | Side Copilot |
|---|---|---|
| Best for | Mac browser with workspaces, tabs as tasks and an AI companion | AI agent in your browser side panel with vertical tab spaces |
| Category | Productivity | Productivity |
| Pricing model | Freemium | Freemium |
| Starting price | See pricing page | $4.90/mo |
| Free plan | Yes | Yes |
| Made by | SigmaOS | Side Copilot |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
SigmaOS starts at See pricing page and Side Copilot starts at $4.90/mo. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
3 plans
Free
Free
- Up to 5 spaces with cloud sync
- Chat with current page
- 2 agent trials per day
Pro
$4.90/mo
- Unlimited spaces
- Agent mode with BYOK
- Custom shortcut templates
Pro+
$11.90/mo
- Everything in Pro
- Unlimited use of Side Copilot agent
- Cross-page browser agent
Prices in USD, checked Oct 29, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
SigmaOS
- Free to download
- Clear tab organization by workspace
- AI answers in the page context
- Mac only
- Takes getting used to after Chrome
- Pricing for extras not shown
Side Copilot
- Free plan with five spaces
- Works across several browsers
- Agent can group and search tabs
- Agent mode is limited on the free plan
- Cross-page agent needs Pro+
- Pro+ price differs between plan table and card
Which one should you choose?
Choose SigmaOS if you want:
- Free to download
- Clear tab organization by workspace
- AI answers in the page context
Watch out: mac only.
Choose Side Copilot if you want:
- Free plan with five spaces
- Works across several browsers
- Agent can group and search tabs
Watch out: agent mode is limited on the free plan.
SigmaOS vs Side Copilot FAQ
What is the difference between SigmaOS and Side Copilot?
SigmaOS: Mac browser with workspaces, tabs as tasks and an AI companion. Side Copilot: AI agent in your browser side panel with vertical tab spaces. Both are productivity tools.
Is SigmaOS or Side Copilot cheaper?
SigmaOS starts at See pricing page and Side Copilot starts at $4.90/mo. Check both pricing pages for current plans.
Do SigmaOS and Side Copilot have free plans?
SigmaOS: Yes. Side Copilot: Yes.
Who makes SigmaOS?
SigmaOS is made by SigmaOS, based in United States.
Who makes Side Copilot?
Side Copilot is made by Side Copilot.
Which should I choose, SigmaOS or Side Copilot?
Choose SigmaOS if you value free to download and clear tab organization by workspace. Choose Side Copilot if you value free plan with five spaces and works across several browsers.