Comet is Perplexity’s AI browser: a full browser with answers, citations, and agents built in. SiteQuest is something else entirely — an overlay that floats over the apps and browser you already use.
They are not fighting for the same job. Here is the honest breakdown.
TL;DR
- Pick Comet if you want research with citations and an agent that completes multi-step web tasks.
- Pick SiteQuest if you want AI access without switching windows — over any app, any browser, any model.
- Many people use both: Comet for deep research sessions, SiteQuest for everything in between.
SiteQuest vs Comet at a Glance
| SiteQuest | Comet | |
|---|---|---|
| What it is | Overlay over any app | Full AI browser |
| Switching cost | Zero — no tabs, no windows | New browser, import everything |
| AI models | Any: ChatGPT, Claude, Gemini, local Ollama | Perplexity (+ agents) |
| Citations | From your own context | Best-in-class, automatic |
| Agent tasks | No autonomous agents | Yes, multi-step tasks |
| Offline/private | Local AI, incognito | Account-based |
| Platforms | macOS, Windows | macOS, Windows, iOS, Android |
| Price | Free core, Plus $3.99, Pro $6.99 | Free; Max $200/mo for agents |
Where Comet Wins
Research with sources. Comet’s answers link to the exact page and paragraph. For fact-checking, procurement, or anything defensible, citations are non-negotiable — Comet is the leader here, full stop.
Agent mode. Tell Comet to compare vendor prices across dashboards or fill a form and it executes. SiteQuest deliberately has no autonomous agents; it assists, it doesn’t act for you.
Free and everywhere. Comet is free on desktop and mobile. If you want one free AI browser on your phone, Comet wins that slot easily.
Where SiteQuest Wins
No switching, ever. Comet is still a browser — you leave your work, enter Comet, do the thing, come back. SiteQuest appears over your current app with Shift+Space and vanishes. For the 40+ micro-lookups a day (a doc, a ChatGPT question, a translation), the overlay removes the trip entirely.
Any model, including offline. Locked to one vendor in Comet. SiteQuest uses ChatGPT, Claude, Gemini, or 100% offline local AI via Ollama. Privacy-sensitive work stays on your machine.
Works with Comet. This is the point most comparisons miss: SiteQuest floats over Comet too. Research session in Comet, quick lookups everywhere else — no conflict.
Privacy Comparison
Comet requires a Perplexity account; research flows through their servers. That’s the price of citations and agents. SiteQuest offers incognito mode, tracker blocking, and local AI that never sends data anywhere. If your work involves client data or sensitive research, run the sensitive parts in SiteQuest with local AI.
Curious what context switching costs you? Try the Focus Points Calculator — it measures how much of your day gets eaten by app and tab switching.
Price Comparison
Comet is free; agent-heavy use pushes toward Max at $200/month. SiteQuest core is free forever, Plus is $3.99/month, Pro is $6.99/month. Different jobs, different math: compare your plans against what you actually use.
New to overlay browsing? Download SiteQuest free and read what an overlay browser is.
Frequently Asked Questions
Is SiteQuest a browser replacement like Comet?
No. Comet replaces Chrome. SiteQuest replaces the trip to Chrome — it floats over whatever you already use, including Comet itself.
Can I use SiteQuest and Comet together?
Yes. Use Comet for deep research sessions with citations, and SiteQuest for quick lookups, AI questions, and translations without leaving your work.
Which is more private, SiteQuest or Comet?
SiteQuest, when using local AI and incognito mode — data never leaves your machine. Comet needs an account and processes research server-side.
Is SiteQuest free?
Core browsing is free forever, including local AI. Plus ($3.99/mo) adds the ad blocker and sync; Pro ($6.99/mo) adds cloud AI, extensions, and unlimited everything.