# Aquanta vs IST+ for Mobile

The clearest difference is update cadence: Aquanta at every 2 months against IST+ for Mobile's every 8 months. IST+ for Mobile's advantage is iOS requirement (9.0 vs 14.0). On price, ads, in-app purchases and device support there is nothing between them.

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

Aquanta ships an update every 2 months, IST+ for Mobile every 8 months. The most recent releases landed on November 7, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Aquanta | IST+ for Mobile |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (1.6K ratings)](https://appshunter.io/ios/app/aquanta/id1482588970/reviews)** | — |
| Number of ratings | **1.6K** | — |
| Positive reviews | 62.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 8 months |
| Monetization | Ad-supported | — |
| Size | 32 MB | 5 MB |
| Requires iOS | 14.0 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Aquanta Inc.](https://appshunter.io/developer/1482588969) | [Information Security Technology Corporation](https://appshunter.io/developer/1650535441) |

## What reviewers say

### Aquanta

[App page](https://appshunter.io/ios/app/aquanta/id1482588970)

Control your water heater remotely, monitor hot water levels, and receive maintenance alerts. Optimize heating schedules for convenience, comfort, and safety, while also saving on energy costs.

**Highlights:** Remote water heater control, Hot water level monitoring, Scheduling and usage patterns, Maintenance and leak alerts, Automatic overheating shutoff, Cost savings through smart heating

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Works good
- 🚀 Saves precious gas and money
- 👍 Stable reliable software
- 👍 Saves energy
- 👍 Simple install & easy to use

**What reviewers complain about**

- 🐛 Needs to update so we can set more than 3 manual times
- 🐛 Doesn't maintain temp
- 🐛 Manual timer mode bug
- 🐛 App not running consistently with heater
- 🐛 Difficult to manage

**Reported bugs**

- Manual timer mode can leave 1 minute at 11:59 to midnight where timer let's water heater run for a minute and then abruptly shuts heater down
- App not a good reflection about what's happening on the ground
- Lost internet connectivity when we upgraded the modem for faster speed
- Unit got stuck in program mode, green lite continuously flashing

**Requested features**

- Set more than 3 manual times
- Incorporate starting temperature, goal temperature, set time for reach goal temp and then determine when the tank needs to start heating
- Manually set a time-of-use plan
- Work with Apple HomeKit
- Nest integration


### IST+ for Mobile

[App page](https://appshunter.io/ios/app/ist-plus-for-mobile/id6444602007)

**In-app purchases:** none


## Frequently asked questions

### Is Aquanta free?

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

### Is IST+ for Mobile free?

IST+ for Mobile is free to download, with no in-app purchases.

### Do Aquanta or IST+ for Mobile have ads?

Neither Aquanta nor IST+ for Mobile shows ads.

### Which is updated more often, Aquanta or IST+ for Mobile?

Aquanta ships an update every 2 months, and IST+ for Mobile every 8 months. Most recently, Aquanta was updated on November 7, 2026 and IST+ for Mobile on November 3, 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.*