What is the best browser for iPhone?

The best browser for iPhone adds what Safari leaves out: Sigma brings AI chat, a built-in ad blocker, and one-tap private browsing with DuckDuckGo — all free.

How do I change my default browser on iPhone?

Open Settings, scroll to Sigma, tap Default Browser App, and select Sigma. Links from other apps will open in it automatically.

How do I turn on private browsing on my iPhone?

In Sigma, tap the Private Mode toggle on the start page — search switches to DuckDuckGo and your session is isolated. One tap on, one tap off.

What is the most private browser for iPhone?

Look for private search, no data collection, and open-source code. Sigma ships all three, plus a built-in ad blocker that cuts trackers.

Is there a browser with a built-in ad blocker for iPhone?

Yes — Sigma includes a free ad blocker on iPhone. Pages load cleaner and faster, with no extensions or separate apps.

Is Safari the best browser for iPhone?

Safari is solid and deeply integrated with iOS, but it has no AI chat or ad blocker built in. Sigma adds both — free.

Is Sigma Browser free on iPhone?

Yes. Sigma is free on the App Store, including AI chat, chat with page, ad blocker, and private mode.

Sigma Browser for iPhone

A better browser for iPhone — AI chat, ad blocker, and private browsing built in.
Free on the App Store.

Download for iOS

Sigma browser on two iPhones: a movie page and its Sigma AI summary

The best browser for iPhone combines privacy, an ad-free web, and smart features like AI chat — that's exactly what Sigma brings to iOS.

Chat with Page panel in Sigma summarizing a Wikipedia article

AI

Ask AI right where you browse.

AI Chat answers and writes in any tab, and Chat With Page turns any article into a conversation.

Private mode toggle and DuckDuckGo search in Sigma browser

Privacy

Your browsing stays on your iPhone.

Sigma is a private browser with isolated sessions and no browsing data collection.

Ad blocker

An ad-free web, out of the box.

The built-in ad blocker cuts ads and trackers on every site — no extensions needed.

Sync

Your AI chats, on every device

AI Chat syncs across your devices — ask on your iPhone, continue on your desktop, and never lose a conversation.

AI chat

AI Chat in Your iPhone Browser

Sigma puts AI chat right in your iPhone web browser: ask questions, summarize articles, and chat with any page — no separate apps, no subscriptions.

Learn more about AI Chat Learn more about Chat With Page

Privacy

Private Browsing on iPhone, Done Right

Incognito mode start page in Sigma browser on iPhone

Sigma is a private browser for iPhone by default: flip on Private Mode and get DuckDuckGo search, isolated sessions, and no browsing data collection. Turning on private browsing on your iPhone is one tap — not a hidden menu.

Learn more about Private Browser

Ad blocker

Built-In Ad Blocker for iPhone

Sigma ships with a free ad blocker for iPhone: pages load cleaner and faster, trackers are cut, and you don't need extensions or separate apps.

Best Browsers for iPhone Compared (2026)

Sigma

Safari

Chrome

AI chat built in

Chat with any page

Built-in ad blocker

Private mode with DuckDuckGo

Free

Sigma is the iPhone web browser that blocks ads, protects your privacy, and answers your questions — free.

How to Get Sigma on Your iPhone

Sigma AI Browser listing card on the App Store with Get button

1

Download on the App Store

Get Sigma free — no account needed.

Make Sigma default toggle over the iPhone dock with the Sigma app icon

2

Make it your default

Open iPhone Settings → Sigma → Default Browser App — links will open in Sigma.

AI chat in Sigma answering a Lisbon trip question with web results

3

Browse with AI

Tap AI Chat on the start page and ask anything.

Download Sigma Browser

Download for iOS

Other platforms

Also available on macOS, Windows and Android.

Questions & Answers

If you have any questions,
reach out to us on X at @Sigma_Browser

Sigma Browser for iPhone