Comparison

FIDOSmart vs Four

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

Head to head
About

FIDOSmart

Features
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The FIDOSmart app uses the power of advanced AI to improve water leak detection, identify other forms of non-revenue water and reduce water loss from utility networks. The end-to-end leakage detection and location solution in your pocket, FIDOSmart leverages the capabilities of FIDO’s cloud-based AI to improve human actions and decision-making on the ground. Comes with an in-built AI-powered co-pilot which responds to queries in human language. Use the app to: - generate optimal deployment locations for FIDO acoustic sensors and avoid network monitoring blindspots. - detect leaks by size and visualise them as investigation Waypoints linked to GIS data. - streamline the end-to-end leak detection and location process from first alert to validation of a successful leak repair, all using accurate AI analysis. - perform multiple leak investigations using the same sensor, including correlation and top sounding, so you don’t need to invest in duplicated equipment. - provide granular insight into the presence of non-leakage NRW with simple features like consumption profiling and Sounding Lite. Join some of the world’s most effective leak teams and try the FIDOSmart app.

About

Four

Features
Read full description

1. After logging in to the APP, you can simultaneously view the devices installed in the sensor cloud platform; 2. After the account obtains the corresponding permissions, it can edit and delete the installed equipment and other management operations; 3. After switching the video device, you can view, play back and capture the installed video device in real time; 4. When the device has an alarm, the alarm will be displayed in the device alarm column, and it will also be pushed to the mobile phone through the message; 5.The APP also provides functions such as notification announcement, message setting, language setting, beginner's guide, and personal information editing.

Screenshots

FIDOSmart4 screens
Four3 screens

Verdict

The call

The clearest difference is iOS requirement: Four at 12.0 against FIDOSmart's 14.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

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

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 25, 2026 and October 14, 2026 respectively.

Scorecard1 real difference Β· 5 level
FIDOSmart versus Four: the parameters behind the verdict, then further details
ParameterFIDOSmartFour
PriceFreeFree
Update frequencyEvery 2 monthsEvery 2 months
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPodiPhone, iPad, iPod β€” better
Requires iOS14.012.0 β€” better
Further details β€” not scored
Size101 MB58 MB
Age rating4+17+
DeveloperFIDO TECH UKXiamen Sixin IoT Technology Co., Ltd.

In-app purchases

None

FIDOSmart

No in-app purchases

None

Four

No in-app purchases

Questions

Is FIDOSmart free?
FIDOSmart is free to download, with no in-app purchases.
Is Four free?
Four is free to download, with no in-app purchases.
Do FIDOSmart or Four have ads?
Neither FIDOSmart nor Four shows ads.
Which is updated more often, FIDOSmart or Four?
FIDOSmart ships an update every 2 months, and Four every 2 months. Most recently, FIDOSmart was updated on October 25, 2026 and Four on October 14, 2026.

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