# FITUEYES vs Optimal°

The clearest difference is update cadence: Optimal° at every 5 months against FITUEYES's every 23 months. FITUEYES's advantage is iOS requirement (12.2 vs 15.1). 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.

FITUEYES ships an update every 23 months, Optimal° every 5 months. The most recent releases landed on May 19, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | FITUEYES | Optimal° |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.9 (7 ratings)](https://appshunter.io/ios/app/optimal/id6473653236/reviews)** |
| Number of ratings | — | **7** |
| Positive reviews | — | 60.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 23 months | **Every 5 months** |
| Monetization | — | Free |
| Size | 150 MB | 19 MB |
| Requires iOS | **12.2** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [黎明 陶](https://appshunter.io/developer/1676875064) | [Its Optimal LLC](https://appshunter.io/developer/1719356914) |

## What reviewers say

### FITUEYES

[App page](https://appshunter.io/ios/app/fitueyes/id6446284681)

**In-app purchases:** none


### Optimal°

[App page](https://appshunter.io/ios/app/optimal/id6473653236)

This app provides remote control and monitoring for a specific brand of tankless water heaters. Users can adjust temperature, track performance metrics, and receive diagnostic information for efficient hot water management.

**Highlights:** Set water heater output temperature, Monitor unit activity state, Track flow rate and energy consumption, View inlet and outlet water temperatures, Access diagnostics and error codes, Enable Vacation Mode

**In-app purchases:** none


## Frequently asked questions

### Is FITUEYES free?

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

### Is Optimal° free?

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

### Do FITUEYES or Optimal° have ads?

Neither FITUEYES nor Optimal° shows ads.

### Which is updated more often, FITUEYES or Optimal°?

FITUEYES ships an update every 23 months, and Optimal° every 5 months. Most recently, FITUEYES was updated on May 19, 2026 and Optimal° on June 1, 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.*