# Private Browser vs Sigma AI Browser

The clearest difference is rating: Private Browser at 4.8 against Sigma AI Browser's 3.9. Private Browser also leads on in-app purchases (none vs 4) and review sentiment (75% vs 50%). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. Sigma AI Browser sells 4 in-app purchases, starting at $10.00 per month. Private Browser asks for nothing beyond the download.

Private Browser holds the better App Store score, 4.8 against 3.9. That said, the two scores are not equally well evidenced: Private Browser has 78 ratings behind it against 10, so its average is the more settled of the two. Written reviews point the same way: 75% of Private Browser's written reviews are positive against 50% of Sigma AI Browser's.

Private Browser ships an update every 11 days, Sigma AI Browser every 2 months. The most recent releases landed on October 27, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Private Browser | Sigma AI Browser |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (78 ratings)](https://appshunter.io/ios/app/private-browser-serenity/id6444428051/reviews)** | [3.9 (10 ratings)](https://appshunter.io/ios/app/sigma-ai-browser/id6670252712/reviews) |
| Number of ratings | **78** | 10 |
| Positive reviews | **75.0% of reviews** | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 11 days** | Every 2 months |
| Monetization | Free | Free |
| Size | 42 MB | 182 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [PassiFlora Technologies](https://appshunter.io/developer/1586581422) | [SigmaBrowser OÜ](https://appshunter.io/developer/1762933222) |

## What reviewers say

### Private Browser

[App page](https://appshunter.io/ios/app/private-browser-serenity/id6444428051)

Browse the internet privately and securely with a built-in VPN. This browser offers features like private tabs, password protection, and automatic clearing of history and cookies. Customize your browsing experience with themes and manage bookmarks easily.

**Highlights:** Private browsing tabs, Unlimited VPN integration, Bookmark management, Automatic history/cookie clearing, Password protection, Customizable themes

**Features:** macOS Compatibility, Apple Wallet, Vision Pro support

**In-app purchases:** none


### Sigma AI Browser

[App page](https://appshunter.io/ios/app/sigma-ai-browser/id6670252712)

Experience a faster, more intelligent web with this AI-powered browser. It offers enhanced security, personalized recommendations, and a clutter-free, ad-free environment. Customize your browsing with intuitive tools for seamless navigation and productivity.

**Highlights:** AI chat companion for answers, Blazing fast browsing speeds, Customizable interface, Multi-device sync, User-friendly design

**Features:** Apple Wallet, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sigma Plus Monthly | $10.00 | per month |
| Sigma Pro Monthly | $75.00 | per month |
| Sigma Plus Annually | $96.00 | per year |
| Sigma Pro Annually | $719.99 | per year |


## Frequently asked questions

### Is Private Browser free?

Private Browser is free to download, with no in-app purchases.

### Is Sigma AI Browser free?

Sigma AI Browser is free to download, with in-app purchases available.

### Which has better reviews, Private Browser or Sigma AI Browser?

Private Browser is rated higher. Private Browser averages 4.8 out of 5 from 78 ratings, while Sigma AI Browser averages 3.9 from 10 ratings.

### Do Private Browser or Sigma AI Browser have ads?

Neither Private Browser nor Sigma AI Browser shows ads.

### Which is updated more often, Private Browser or Sigma AI Browser?

Private Browser ships an update every 11 days, and Sigma AI Browser every 2 months. Most recently, Private Browser was updated on October 27, 2026 and Sigma AI Browser on October 31, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*