# Optimal° vs Watchism

Optimal° and Watchism both sit at 4.9 stars, but that hides the real split: 100% of Watchism's written reviews are positive against 60% of Optimal°'s. Watchism also leads on update cadence (every 5 days vs every 5 months). Optimal°'s advantage is iOS requirement (15.1 vs 26.0). On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 4.9 for Optimal° against 5.0 for Watchism. Both are backed by a comparable volume of ratings — 7 and 3 respectively. Written reviews are what separate them: 60% of Optimal°'s written reviews are positive against 100% of Watchism's.

Optimal° ships an update every 5 months, Watchism every 5 days. The most recent releases landed on September 29, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Optimal° | Watchism |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (7 ratings)](https://appshunter.io/ios/app/optimal/id6473653236/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/watchism/id6760947199/reviews)** |
| Number of ratings | **7** | 3 |
| Positive reviews | 60.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 5 days** |
| Monetization | Free | Free |
| Size | 19 MB | 12 MB |
| Requires iOS | **15.1** | 26.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 17+ | 17+ |
| Developer | [Its Optimal LLC](https://appshunter.io/developer/1719356914) | [Aldo Gonzalez](https://appshunter.io/developer/1886972524) |

## What reviewers say

### 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


### Watchism

[App page](https://appshunter.io/ios/app/watchism/id6760947199)

This app provides a precise reference clock using various network time sources and a private digital vault for documenting your watch collection. Track wear, view insights, manage wishlists, and store photos and notes securely on your device.

**Highlights:** Precise reference clock, Multiple time source options, On-device watch collection vault, Wear tracking and insights, Wishlist management, Photo and note storage, Browser integration for online watches

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Optimal° free?

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

### Is Watchism free?

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

### Which has better reviews, Optimal° or Watchism?

Watchism is rated higher. Optimal° averages 4.9 out of 5 from 7 ratings, while Watchism averages 5.0 from 3 ratings.

### Do Optimal° or Watchism have ads?

Neither Optimal° nor Watchism shows ads.

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

Optimal° ships an update every 5 months, and Watchism every 5 days. Most recently, Optimal° was updated on September 29, 2026 and Watchism on October 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.*