Comparison

Multi vs Roberts Hot Tub Controller

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

Head to head
About

Multi

Read full description

The Multi-Smart multifunctional module is designed to control central heating and ventilation systems (destratifier or free cooling). It generates a Wi-Fi signal that enables the user to establish a local connection via a smartphone or iOS-compatible tablet. Several configurable functions enable the user to control boilers, pumps, motorized valves, and fans according to temperature measurements and programmes hours. In order to use certain functions, the Multi-Smart must be combined with one or more programmable room thermostats. Possible functions Control of a boiler and pumps for domestic hot-water production without three-way valve Control of a boiler, pumps, and a three-way valve for domestic hot-water production Control of a boiler and up to four pumps or zone valves in a multi-zone system Cascade control of two boilers depending on the outside temperature Pump or three-way valve control in a system with solar panels Control of destratifier fan Control of a variable-speed pump in a co-generation unit Control of a boiler, domestic hot-water production, and a heating circuit that can be temperature-adjusted according to the room temperature Control of a mixing valve and two pumps to ensure constant temperature control of hot water in a domestic heating system or domestic hot-water circuit Control of a boiler, a mixing valve, and two pumps for outdoor temperature control Control of a variable-speed fan in a free-cooling installation. Inputs and outputs The Multi-Smart is powered by 230 V. It has two inputs for PTC thermistor probes, four inputs for connections, five outputs with connections for boiler, pump, valve, fan control and a 0-10 V output for modulating boiler or variable-speed pump or fan. Documents and usage instructions are available on www.tempolec.be

About

Roberts Hot Tub Controller

Control your hot tub remotely from your iOS device. Adjust temperature, set filtration cycles, and manage pumps. Built-in freeze protection ensures your tub is safe.

Highlights
  • Remote hot tub control
  • Temperature adjustment
  • Filtration cycle settings
  • Pump on/off control
  • Built-in freeze protection
Features
Read full description

The RHtubs Controller App, is an app for your iOS device that allows you to access your hot tub via a direct connection anywhere in the local proximity of your tub, anywhere in your house that you can connect to your local WiFi network. The App is the only control that works with the Roberts Hot Tubs Controller and has full functionality to set temperature, filtration cycles and to turn pumps on and off. Freeze controllers are also already built in by default.

Screenshots

Multi4 screens
Roberts Hot Tub Controller4 screens

Verdict

The call

The clearest difference is update cadence: Roberts Hot Tub Controller at monthly against Multi's every 29 months. Multi's advantage is iOS requirement (11.0 vs 13.0). On price, ads, 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

Multi ships an update every 29 months, Roberts Hot Tub Controller monthly. The most recent releases landed on October 10, 2026 and October 8, 2026 respectively.

Scorecard2 real differences · 8 level
Multi versus Roberts Hot Tub Controller: the parameters behind the verdict, then further details
ParameterMultiRoberts Hot Tub Controller
PriceFreeFree
Rating—3.3 (4 ratings) — better
Positive reviews—66.7% of reviews
Number of ratings—4 — better
Update frequencyEvery 29 monthsMonthly — better
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better13.0
Further details — not scored
Size28 MB45 MB
Age rating4+4+
DeveloperTempolecRobert's Hot Tubs, Inc.

In-app purchases

None

Multi

No in-app purchases

None

Roberts Hot Tub Controller

No in-app purchases

Questions

Is Multi free?
Multi is free to download, with no in-app purchases.
Is Roberts Hot Tub Controller free?
Roberts Hot Tub Controller is free to download, with no in-app purchases.
Do Multi or Roberts Hot Tub Controller have ads?
Neither Multi nor Roberts Hot Tub Controller shows ads.
Which is updated more often, Multi or Roberts Hot Tub Controller?
Multi ships an update every 29 months, and Roberts Hot Tub Controller monthly. Most recently, Multi was updated on October 10, 2026 and Roberts Hot Tub Controller on October 8, 2026.

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