# Universal Security Instruments vs Primo Scale

The clearest difference is in-app purchases: Universal Security Instruments at none against Primo Scale's 4. Universal Security Instruments also leads on rating (5.0 vs 4.8). Primo Scale's advantage is update cadence (every 2 weeks vs every 2 months) and ratings volume (5 vs 1). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. Primo Scale sells 4 in-app purchases, starting at $3.99 per 7 days. Universal Security Instruments asks for nothing beyond the download.

Universal Security Instruments holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Primo Scale has 5 ratings behind it against 1, so its average is the more settled of the two.

Universal Security Instruments ships an update every 2 months, Primo Scale every 2 weeks. The most recent releases landed on September 30, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Universal Security Instruments | Primo Scale |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/universal-security-instruments/id6756246978/reviews)** | [4.8 (5 ratings)](https://appshunter.io/ios/app/primo-scale-scale-for-grams/id6761748068/reviews) |
| Number of ratings | 1 | **5** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Free | Free |
| Size | 200 MB | 25 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [Feit Electric](https://appshunter.io/developer/1022520207) | [Primo Technology Ltd.](https://appshunter.io/developer/1809398942) |

## What reviewers say

### Universal Security Instruments

[App page](https://appshunter.io/ios/app/universal-security-instruments/id6756246978)

Manage and control your smart security and environmental devices remotely. This app offers a central hub for all your connected products, allowing for easy setup, monitoring, and sharing of device access with others.

**Highlights:** Remote device management, Monitor devices globally, Share device access, Simple and secure setup, Centralized hub for USI products

**Features:** macOS Compatibility

**In-app purchases:** none


### Primo Scale

[App page](https://appshunter.io/ios/app/primo-scale-scale-for-grams/id6761748068)

This app transforms your phone into a versatile measurement tool. It uses AI and your camera to weigh objects, measure dimensions, count items, and scan food for nutritional information, eliminating the need for physical tools.

**Highlights:** Digital gram scale for weighing objects, AI tape measure and ruler for dimensions, Object counter for pills, coins, and more, Food scanner for calorie and macro tracking, LiDAR support for enhanced accuracy on iPhones, Offline functionality for most scan types

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly Limited Subscription | $3.99 | per 7 days |
| Premium Weekly Subscription | $5.99 | per 7 days |
| Premium Yearly Limited Subscription | $19.99 | per year |
| Premium Yearly Subscription | $29.99 | per year |


## Frequently asked questions

### Is Universal Security Instruments free?

Universal Security Instruments is free to download, with no in-app purchases.

### Is Primo Scale free?

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

### Which has better reviews, Universal Security Instruments or Primo Scale?

Universal Security Instruments is rated higher. Universal Security Instruments averages 5.0 out of 5 from 1 ratings, while Primo Scale averages 4.8 from 5 ratings.

### Do Universal Security Instruments or Primo Scale have ads?

Neither Universal Security Instruments nor Primo Scale shows ads.

### Which is updated more often, Universal Security Instruments or Primo Scale?

Universal Security Instruments ships an update every 2 months, and Primo Scale every 2 weeks. Most recently, Universal Security Instruments was updated on September 30, 2026 and Primo Scale on October 6, 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.*