# StealthOS vs ChronoCalc Pro

The clearest difference is in-app purchases: ChronoCalc Pro at none against StealthOS's 2. StealthOS's advantage is update cadence (weekly vs every 5 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. StealthOS sells 2 in-app purchases, starting at $4.99 per month. ChronoCalc Pro asks for nothing beyond the download.

StealthOS ships an update weekly, ChronoCalc Pro every 5 months. Both last shipped on October 28, 2026.

## The numbers

| Metric | StealthOS | ChronoCalc Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (10 ratings)](https://appshunter.io/ios/app/stealthos-private-browser/id6756983634/reviews)** | — |
| Number of ratings | **10** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 5 months |
| Monetization | Freemium | — |
| Size | 221 MB | 4 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Olib AI](https://appshunter.io/developer/1864031901) | [ERLEND JOHNSRUD VAAGE](https://appshunter.io/developer/1760100550) |

## What reviewers say

### StealthOS

[App page](https://appshunter.io/ios/app/stealthos-private-browser/id6756983634)

This app provides a secure, private browsing experience with advanced anti-fingerprinting, built-in Tor, and encrypted storage. It offers an on-device AI assistant and a virtual desktop environment for enhanced productivity and research.

**Highlights:** Anti-fingerprinting technology, Built-in Tor browser, AES-256 encrypted storage, On-device AI assistant, Virtual desktop environment, Password manager with TOTP, AI-powered phishing detection

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $4.99 | per month |
| Yearly Premium | $49.99 | per year |


### ChronoCalc Pro

[App page](https://appshunter.io/ios/app/chronocalc-pro/id6757017750)

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

**In-app purchases:** none


## Frequently asked questions

### Is StealthOS free?

StealthOS is free to download, with in-app purchases available.

### Is ChronoCalc Pro free?

ChronoCalc Pro is free to download, with no in-app purchases.

### Do StealthOS or ChronoCalc Pro have ads?

Neither StealthOS nor ChronoCalc Pro shows ads.

### Which is updated more often, StealthOS or ChronoCalc Pro?

StealthOS ships an update weekly, and ChronoCalc Pro every 5 months. Most recently, StealthOS was updated on October 28, 2026 and ChronoCalc Pro on October 28, 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.*