SDCSecurity vs USALink
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SDCSecurity
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.
- Access and egress solutions
- Door opening security
- Fire and life safety
- Electrical application integration
- DoorSnap feature
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SDC free App now includes DoorSnap. SDC is complete access and egress solutions: the lock behind the system. SDC innovates the practical application of electricity to door openings for security and fire & life safety. It"s where we started over 40 years ago and it continues to be our singular focus today.
USALink
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.
- 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
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USALink is a feature rich iOS application for customers of USA Central Station that gives full access to their monitoring station accounts. View account summary, site history, place sites on test, edit site and contact phones, edit site data, edit device data, edit configuration, edit site notes, view action plans, view site changes, metric graphs, signal scroll and more!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | SDCSecurity | USALink |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (6 ratings) — better | 3.0 (7 ratings) |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | 6 | 7 — better |
| Update frequency | Every 20 months | Every 3 months — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 38 MB | 26 MB |
| Age rating | 17+ | 4+ |
| Developer | SDC Security Door Controls | USA Central Station |
Customer experience
SDCSecurity
USALink
In-app purchases
SDCSecurity
No in-app purchases
USALink
No in-app purchases
Questions
Is SDCSecurity free?
Is USALink free?
Which has better reviews, SDCSecurity or USALink?
Do SDCSecurity or USALink have ads?
Which is updated more often, SDCSecurity or USALink?
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