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Perplexity Comet vs Sigma AI Browser
Perplexity Comet scores higher overall (8.7 vs 6.9), but the right pick depends on what you need.
Choose Perplexity Comet if…
People who want the most capable free AI browser on every device
8.7/10★★★★★Full review →Choose Sigma AI Browser if…
Privacy-focused users who want local AI with an agent on top
6.9/10★★★★★Full review →Side by side
| Perplexity Comet | Sigma AI Browser | |
|---|---|---|
| Overall score | 8.7/10 | 6.9/10 |
| Rank in category | #1 of 10 | #8 of 10 |
| Price | Freemium · from $5/month | Freemium |
| Free version | Full browser and Comet Assistant free on every platform, with limits on heavier AI features | Free browser with AI chat and local AI |
| Platforms | Mac, Windows, iOS, Android | Mac, Windows, iOS, Android |
| Made by | Perplexity AI | Sigmabrowser OÜ |
| Agent quality | 8 | 5.5 |
| Ease of use | 8.5 | 7 |
| Features | 9 | 7 |
| Value for money | 9 | 7.5 |
| Platforms | 10 | 9 |
Perplexity Comet: what the AI does
- Comet Assistant on every page
- Agent that browses and completes tasks
- Questions and comparisons across open tabs
- Research answers with citations
- Choice of AI models
- Voice assistant
- Free on Mac, Windows, iPhone and Android
- Strongest built-in agent among mainstream browsers
- Syncs bookmarks and history across devices
- Built-in ad blocker
- Perplexity says it uses the browser partly to collect data for ad targeting
- No iPad app, and some connectors are desktop-only
- Free tier caps heavier AI features
Sigma AI Browser: what the AI does
- AI agent for forms, bookings and workflows
- Eclipse on-device AI model
- Chat with the current page
- Deep research mode
- AI chat and image generation
- On-device AI keeps data local
- Agent plus assistant in one free browser
- Desktop and iPhone apps
- Very few app-store ratings and little independent testing
- Local AI is slower on complex questions
- Paid plan pricing isn't clearly published