Perplexity Comet vs SigmaOS: Pricing and Ratings Compared (2026)
Entry prices and free plans as read on each vendor's pricing page, and user ratings as published on review sites, for Perplexity Comet and SigmaOS side by side. This page compares data; it is not a hands-on review.
On the data: On the data below the two are close or not directly comparable, so we do not name a winner for this pair.
Short on time? Here's the quick answer
Based on published vendor pricing and features and on public review data, here's who should pick what:
Perplexity Comet
An agentic browser that answers questions and takes action across tabs
Best for you if:
- • You want an agentic browser that answers questions and takes action across tabs
SigmaOS
Organize tabs like tasks, multitask with split-screen, and get AI answers
Best for you if:
- • You want a fully free tool (Perplexity Comet requires payment)
| At a Glance | Perplexity Comet | SigmaOS |
|---|---|---|
Starts at | Free plan | Free 100% free |
Category | AI Agents Productivity | Browser DevTools Productivity |
Rating | 3.8/5 G2 4.4 · PeerSpot 1.5 15 reviews | n/a |
Free plan | Yes | Yes |
Choose Perplexity Comet or SigmaOS?
Choose Perplexity Comet if
- You want an agentic browser that answers questions and takes action across tabs
- You work in AI agents, not browser devtools
Choose SigmaOS if
- You want a fully free tool (Perplexity Comet requires payment)
- You want significantly improves tab management and organization with workspaces and vertical tabs
- You want AI companion, Airis, provides intelligent assistance directly within the browsing experience
- You work in browser devtools, not AI agents
In-Depth Analysis
Perplexity Comet
An agentic browser that answers questions and takes action across tabs
Weaknesses
- Con: Security researchers at Brave demonstrated that Comet's assistant is vulnerable to indirect prompt injection, where hidden instructions planted in an ordinary webpage can hijack the agent to read your email, pull one-time passcodes, and exfiltrate data using your own logged-in privileges.
- Con: Perplexity initially dismissed the disclosed CometJacking data-exfiltration flaw as having no security impact before quietly patching it, which raises questions about how the vendor handles vulnerability reports on an agent that operates across your authenticated sessions.
- Con: Mobile support is still immature because Android access only arrived in November 2025 and iOS not until March 2026, well behind the July 2025 desktop launch.
- Con: The full agentic capabilities depend on Perplexity's own AI stack and subscription tiers, so buyers wanting a neutral browser or a different underlying model will find themselves locked into Perplexity's ecosystem.
SigmaOS
Organize tabs like tasks, multitask with split-screen, and get AI answers
SigmaOS currently offers only a Free tier, which is inherently fair and generous as there are no monetary costs involved.
Strengths
- Pro: Significantly improves tab management and organization with workspaces and vertical tabs.
- Pro: AI companion, Airis, provides intelligent assistance directly within the browsing experience.
- Pro: Enhances focus and reduces distractions with features like ad-blocking, focus mode, and simplification.
- Pro: Supports multiple logins and separate profiles for efficient context switching.
Weaknesses
- Con: Requires users to adapt to a new browsing paradigm, which may have a learning curve.
- Con: Compatibility with all browser extensions is not explicitly mentioned.
Key features
Plans and prices: Perplexity Comet vs SigmaOS
| Tool | Plans and prices | Source |
|---|---|---|
| Perplexity Comet | No plan prices on file | comet.perplexity.ai |
| SigmaOS |
| sigmaos.com read Oct 24, 2026 |
Prices as read on each vendor's own pricing page on the date shown. Plans are listed per tool and are not matched against the other tool's plans: a plan name or price in one column says nothing about the same row in the other. Details on Perplexity Comet pricing and SigmaOS pricing.
Key Takeaways
Perplexity Comet
- Choose if you want an agentic browser that answers questions and takes action across tabs
SigmaOS
- Choose if you want organize tabs like tasks, multitask with split-screen, and get AI answers
What the data shows
On the data below the two are close or not directly comparable, so we do not name a winner for this pair.
- Only Perplexity Comet has a published user rating (3.8/5 from 15 reviews); SigmaOS has none we can show.
- Both have a free plan.
Criteria: user rating (only above 20 reviews on both sides, gap of 0.2 or more), entry price (only on the same billing basis), free plan. How we rate
Frequently Asked Questions
How do Perplexity Comet and SigmaOS compare in 2026?
On the data below the two are close or not directly comparable, so we do not name a winner for this pair. Only Perplexity Comet has a published user rating (3.8/5 from 15 reviews); SigmaOS has none we can show. Both have a free plan.
What are Perplexity Comet and SigmaOS used for?
Perplexity Comet: An agentic browser that answers questions and takes action across tabs. SigmaOS: Organize tabs like tasks, multitask with split-screen, and get AI answers.
What does Perplexity Comet cost vs SigmaOS?
Perplexity Comet has no public paid-plan price on file. SigmaOS is free. Prices read on the vendors' pricing pages, latest check Oct 24, 2026.
What's the main difference between Perplexity Comet and SigmaOS?
Perplexity Comet focuses on an agentic browser that answers questions and takes action across tabs. SigmaOS's main strength: significantly improves tab management and organization with workspaces and vertical tabs.