# Safe vs Units

The clearest difference is in-app purchases: Units at none against Safe's 1. Units also leads on ads (none vs shown) and update cadence (every 2 days vs fortnightly). Safe's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price there is nothing between them.

Both are free to download. Safe sells 1 one-off in-app purchase. Units asks for nothing beyond the download.

Safe ships an update fortnightly, Units every 2 days. The most recent releases landed on November 3, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Safe | Units |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (561 ratings)](https://appshunter.io/ios/app/safe-secret-browser-security/id1540779650/reviews)** | — |
| Number of ratings | **561** | — |
| Positive reviews | 57.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 127 MB | 6 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Sergey Irgeshov](https://appshunter.io/developer/1533287938) | [WiseInsur technology Inc.](https://appshunter.io/developer/1692305734) |

## What reviewers say

### Safe

[App page](https://appshunter.io/ios/app/safe-secret-browser-security/id1540779650)

Browse the internet privately with a secure browser that protects your data. Features include PIN/biometric access, secure downloads, and automatic history cleanup. Keep your online activity completely private and under your control.

**Highlights:** PIN and biometric access, Secure internal storage for downloads, Password protection for downloads, Automatic tab and history cleanup, Private browsing, Bookmark management

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium version | $6.99 | one-time |

**What reviewers like**

- 👍 Pretty good
- 🚀 No ads
- 🔒 Provides privacy
- 👍 Useful calculator
- 👍 Fantastic calculator

**What reviewers complain about**

- 🐛 Tells me there are viruses when there are not
- 🐛 Doesn't let me go back to the calculator
- 🐛 Gives wrong calculation results
- 🐛 Keeps asking for password
- 🐛 Doesn't work after updates

**Reported bugs**

- Password starting with 0 doesn't work
- Doesn't let me log in
- Keeps asking to agree to privacy policy
- Doesn't work on iOS 13
- Glitches and freezes

**Requested features**

- Add landscape mode
- Add ability to change password
- Add ability to hide the browser and go back to calculator
- Add ability to play games


### Units

[App page](https://appshunter.io/ios/app/units-converter-and-formulas/id6821465699)

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

**In-app purchases:** none


## Frequently asked questions

### Is Safe free?

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

### Is Units free?

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

### Do Safe or Units have ads?

Safe shows ads; Units does not.

### Which is updated more often, Safe or Units?

Safe ships an update fortnightly, and Units every 2 days. Most recently, Safe was updated on November 3, 2026 and Units on November 6, 2026.

---

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