kitio.aiFellou vs Sigma Browser
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Sigma Browser has the lower starting price: about $10 a month, against $19 for Fellou.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Browser agents
- Deep search reports
- Background workspaces
- Form filling
- Logged-in site actions
- Browser AI agent
- On-device Eclipse model
- Chat with page
- Deep research
- Image generation
- Built-in ad blocker
| Feature | Fellou | Sigma Browser |
|---|---|---|
| Best for | Agentic AI browser for deep research and automated web tasks | Privacy-focused browser with an AI agent and an on-device model |
| Category | Productivity | Productivity |
| Pricing model | Freemium | Freemium |
| Starting price | $19/mo | $10/mo |
| Free plan | Yes | Yes |
| Made by | Fellou | Sigma |
| Based in | – | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
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Pricing compared
Sigma Browser has the lower starting price: about $10 a month, against $19 for Fellou.
Free plan
Cheapest paid plan
Top plan
Free trial
4 plans
Free
Free
- 1,000 Sparks new-user bonus (~4 tasks)
- 2 scheduled tasks
Plus
$19/mo
- 2,000 Sparks/month (~8 tasks)
- 3 scheduled tasks
- Priority support
- Early access to new features
Pro
$39.90/mo
- 5,000 Sparks/month (~20 tasks)
- 5 scheduled tasks
- Priority support
Ultra
$199.90/mo
- Unlimited Sparks (limited time)
- Unlimited scheduled tasks
- Unlimited concurrent tasks
- Exclusive priority support
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
Fellou
- Runs tasks in the background
- Good research reports
- Free tier to try
- Agents can be slow
- Younger and less proven
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 Fellou if you want:
- Runs tasks in the background
- Good research reports
- Free tier to try
Watch out: agents can be slow.
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.
Fellou vs Sigma Browser FAQ
What is the difference between Fellou and Sigma Browser?
Fellou: Agentic AI browser for deep research and automated web tasks. Sigma Browser: Privacy-focused browser with an AI agent and an on-device model. Both are productivity tools.
Is Fellou or Sigma Browser cheaper?
Sigma Browser has the lower starting price: about $10 a month, against $19 for Fellou.
Do Fellou and Sigma Browser have free plans?
Fellou: Yes. Sigma Browser: Yes.
Who makes Fellou?
Fellou is made by Fellou.
Who makes Sigma Browser?
Sigma Browser is made by Sigma.
Which should I choose, Fellou or Sigma Browser?
Choose Fellou if you value runs tasks in the background and good research reports. Choose Sigma Browser if you value local model keeps prompts on device and agent completes tasks on web pages.