Comparison

App4SHM vs Gargoyle Sentinel

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

About

Gargoyle Sentinel

Features
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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

App4SHM4 screens
Gargoyle Sentinel4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

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.

Scorecard2 real differences · 4 level
App4SHM versus Gargoyle Sentinel: the parameters behind the verdict, then further details
ParameterApp4SHMGargoyle Sentinel
PriceFreeFree
Update frequencyEvery 4 monthsEvery 2 months — better
AdsNo — betterYes
In-app purchasesNoNo
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS13.0 — better15.5
Further details — not scored
Size27 MB110 MB
Age rating4+4+
DeveloperCOFACGargoyle Systems, LLC

In-app purchases

None

App4SHM

No in-app purchases

None

Gargoyle Sentinel

No in-app purchases

Questions

Is App4SHM free?
App4SHM is free to download, with no in-app purchases.
Is Gargoyle Sentinel free?
Gargoyle Sentinel is free to download, with no in-app purchases.
Do App4SHM or Gargoyle Sentinel have ads?
Gargoyle Sentinel shows ads; App4SHM does not.
Which is updated more often, App4SHM or Gargoyle Sentinel?
App4SHM ships an update every 4 months, and Gargoyle Sentinel every 2 months. Most recently, App4SHM was updated on October 14, 2026 and Gargoyle Sentinel on October 19, 2026.

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