# SDCSecurity vs USALink

The clearest difference is rating: SDCSecurity at 5.0 against USALink's 3.0. USALink's advantage is ads (none vs shown) and update cadence (every 3 months vs every 20 months). On price, ratings volume, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

SDCSecurity holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 6 and 7 respectively.

SDCSecurity ships an update every 20 months, USALink every 3 months. The most recent releases landed on June 5, 2026 and June 4, 2026 respectively.

## The numbers

| Metric | SDCSecurity | USALink |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (6 ratings)](https://appshunter.io/ios/app/sdcsecurity/id499401163/reviews)** | [3.0 (7 ratings)](https://appshunter.io/ios/app/usalink/id1018950976/reviews) |
| Number of ratings | 6 | **7** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 20 months | **Every 3 months** |
| Monetization | Ad-supported | **Free** |
| Size | 38 MB | 26 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [SDC Security Door Controls](https://appshunter.io/developer/499401166) | [USA Central Station](https://appshunter.io/developer/1018950975) |

## What reviewers say

### SDCSecurity

[App page](https://appshunter.io/ios/app/sdcsecurity/id499401163)

This business application provides comprehensive access and egress solutions for door openings, focusing on security and fire safety. It integrates practical electrical applications for enhanced control and safety.

**Highlights:** Access and egress solutions, Door opening security, Fire and life safety, Electrical application integration, DoorSnap feature

**Features:** macOS Compatibility

**In-app purchases:** none


### USALink

[App page](https://appshunter.io/ios/app/usalink/id1018950976)

Manage your monitoring station accounts with this iOS app. Access account summaries, site history, and make various edits to site and device data. View action plans, site changes, and detailed metric graphs.

**Highlights:** View account summary, Access site history, Place sites on test, Edit site and contact phones, Edit site and device data, View action plans and site changes, Metric graphs and signal scroll

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SDCSecurity free?

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

### Is USALink free?

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

### Which has better reviews, SDCSecurity or USALink?

SDCSecurity is rated higher. SDCSecurity averages 5.0 out of 5 from 6 ratings, while USALink averages 3.0 from 7 ratings.

### Do SDCSecurity or USALink have ads?

SDCSecurity shows ads; USALink does not.

### Which is updated more often, SDCSecurity or USALink?

SDCSecurity ships an update every 20 months, and USALink every 3 months. Most recently, SDCSecurity was updated on June 5, 2026 and USALink on June 4, 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.*