App4SHM vs Gargoyle Sentinel
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
App4SHM
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App4SHM is a smartphone application for structural health monitoring (SHM) of bridges or other civil structures to assess their condition after a catastrophic event or when required by authorities and stakeholders. The application interrogates the phone’s internal accelerometer to measure structural accelerations and applies artificial intelligence techniques to detect damage in almost real time. App4SHM resulted from academic research developed at Lusófona University, in particular the Civil Research Group and the Department of Computer Engineering and Information Systems.
Gargoyle Sentinel
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Sentinel by Gargoyle Systems is your window into the low-altitude skies. Built for homeowners, enterprises, and security providers, Sentinel connects to the Gargoyle rooftop node network to deliver real-time insights, alerts, and data on drone activity in your area. Features: • Live Drone Detection: See drone activity around your location in real time. • Smart Notifications: Get alerts when drones enter your monitored airspace. • Interactive Map: View coverage zones and nearby Gargoyle nodes. • Decentralized Network: Powered by Gargoyle’s rooftop hardware and blockchain incentives, providing privacy-first, community-driven coverage. • Secure Data Layer: Monitor not just threats, but also emerging aerial infrastructure like deliveries and autonomous flight paths. With Sentinel, you’re not just observing the skies you’re helping build the next layer of infrastructure for secure, scalable, and autonomous air travel.
Screenshots
Verdict
The clearest difference is ads: App4SHM at none against Gargoyle Sentinel's shown. App4SHM also leads on iOS requirement (13.0 vs 15.5). On price, update cadence, 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.
App4SHM ships an update every 4 months, Gargoyle Sentinel every 2 months. The most recent releases landed on October 14, 2026 and October 19, 2026 respectively.
| Parameter | App4SHM | Gargoyle Sentinel |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 months | Every 2 months — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 — better | 15.5 |
| Further details — not scored | ||
| Size | 27 MB | 110 MB |
| Age rating | 4+ | 4+ |
| Developer | COFAC | Gargoyle Systems, LLC |
In-app purchases
App4SHM
No in-app purchases
Gargoyle Sentinel
No in-app purchases
Questions
Is App4SHM free?
Is Gargoyle Sentinel free?
Do App4SHM or Gargoyle Sentinel have ads?
Which is updated more often, App4SHM or Gargoyle Sentinel?
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