FIDOSmart vs Four
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
FIDOSmart
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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 FIDOβs 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 donβt 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 worldβs most effective leak teams and try the FIDOSmart app.
Four
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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
Verdict
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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 25, 2026 and October 14, 2026 respectively.
| Parameter | FIDOSmart | Four |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad, iPod β better |
| Requires iOS | 14.0 | 12.0 β better |
| Further details β not scored | ||
| Size | 101 MB | 58 MB |
| Age rating | 4+ | 17+ |
| Developer | FIDO TECH UK | Xiamen Sixin IoT Technology Co., Ltd. |
In-app purchases
FIDOSmart
No in-app purchases
Four
No in-app purchases








