# JG Underfloor vs LetSmart

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.

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.

## The numbers

| Metric | JG Underfloor | LetSmart |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 13 months** |
| Monetization | Free | — |
| Size | 177 MB | 208 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Reliance Worldwide Corporation aust. Pty. Ltd.](https://appshunter.io/developer/1638011999) | [Tecasa Inc.](https://appshunter.io/developer/1804126997) |

## What reviewers say

### JG Underfloor

[App page](https://appshunter.io/ios/app/jg-underfloor/id1638011997)

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.

**Highlights:** Connect to John Guest thermostats, Manage timers, Zone control, Configure RF systems, Configure hard-wired systems, Intuitive user interface

**Features:** macOS Compatibility

**In-app purchases:** none


### LetSmart

[App page](https://appshunter.io/ios/app/letsmart/id6743710664)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is JG Underfloor free?

JG Underfloor is free to download, with no in-app purchases.

### Is LetSmart free?

LetSmart is free to download, with no in-app purchases.

### Do JG Underfloor or LetSmart have ads?

Neither JG Underfloor nor LetSmart shows ads.

### Which is updated more often, JG Underfloor or LetSmart?

JG Underfloor ships an update every 14 months, and LetSmart every 13 months. Most recently, JG Underfloor was updated on June 10, 2026 and LetSmart on September 14, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*