JG Underfloor vs LetSmart
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
JG Underfloor
Control your home's underfloor heating system with this intuitive app. Manage thermostats and timers for ultimate zone control and easy configuration of both RF and hard-wired systems.
- Connect to John Guest thermostats
- Manage timers
- Zone control
- Configure RF systems
- Configure hard-wired systems
- Intuitive user interface
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The JG Underfloor APP is designed to be an easy to use, intuitive solution for connecting to the John Guest range of thermostats and timers. Used for both RF and hard wired systems the app provides the user with ultimate zone control and ease of configuration.
LetSmart
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Hello! I am your all-in-one smart home assistant. · Smart Connectivity – Easily connect your smart appliances and control them remotely. · Customizable Scenes – Define your own combinations, such as “Welcome home” and “Scheduled start.” · Continuous Updates – Regularly adding support for more brands to enhance your smart home experience. Smart living, now in your hands!
Screenshots
Verdict
JG Underfloor and LetSmart are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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.
JG Underfloor ships an update every 14 months, LetSmart every 13 months. The most recent releases landed on June 10, 2026 and September 14, 2026 respectively.
| Parameter | JG Underfloor | LetSmart |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| Update frequency | Every 14 months | Every 13 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 177 MB | 208 MB |
| Age rating | 4+ | 12+ |
| Developer | Reliance Worldwide Corporation aust. Pty. Ltd. | Tecasa Inc. |
In-app purchases
JG Underfloor
No in-app purchases
LetSmart
No in-app purchases
