# uSpectrum PAR vs Apparent Water Heater

The clearest difference is rating: Apparent Water Heater at 5.0 against uSpectrum PAR's 1.0. Apparent Water Heater also leads on update cadence (every 2 months vs every 8 months). uSpectrum PAR's advantage is device support (3 vs 1) and ratings volume (3 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Apparent Water Heater holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

uSpectrum PAR ships an update every 8 months, Apparent Water Heater every 2 months. The most recent releases landed on October 21, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | uSpectrum PAR | Apparent Water Heater |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (3 ratings)](https://appshunter.io/ios/app/uspectrum-par/id1466017397/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/apparent-water-heater/id6737422939/reviews)** |
| Number of ratings | **3** | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 25 MB | 52 MB |
| Requires iOS | **9.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [United Power Research Technology Corporation](https://appshunter.io/developer/1501316337) | [Apparent Inc.](https://appshunter.io/developer/1776216635) |

## What reviewers say

### uSpectrum PAR

[App page](https://appshunter.io/ios/app/uspectrum-par/id1466017397)

This application connects wirelessly to a handheld spectral PAR meter, allowing remote analysis and configuration of light sources. It displays detailed spectral data, light source information, and absorption metrics, with options to save and share measurements.

**Highlights:** Wireless Bluetooth connection, Remote light source analysis, Save captured data, Display spectrum and CIE diagrams, View light source metrics (LUX, CCT, CRI), Share measured data via email

**Features:** macOS Compatibility

**In-app purchases:** none


### Apparent Water Heater

[App page](https://appshunter.io/ios/app/apparent-water-heater/id6737422939)

Monitor your renewable energy system in real-time. Track water temperature, energy consumption, savings, and environmental impact directly from your smartphone. Optimize your system's performance and contribute to a greener planet.

**Highlights:** Real-time temperature monitoring, Energy usage tracking, Money saved calculation, Environmental impact tracking, Smartphone control

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

**In-app purchases:** none


## Frequently asked questions

### Is uSpectrum PAR free?

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

### Is Apparent Water Heater free?

Apparent Water Heater is free to download, with no in-app purchases.

### Which has better reviews, uSpectrum PAR or Apparent Water Heater?

Apparent Water Heater is rated higher. uSpectrum PAR averages 1.0 out of 5 from 3 ratings, while Apparent Water Heater averages 5.0 from 1 ratings.

### Do uSpectrum PAR or Apparent Water Heater have ads?

Neither uSpectrum PAR nor Apparent Water Heater shows ads.

### Which is updated more often, uSpectrum PAR or Apparent Water Heater?

uSpectrum PAR ships an update every 8 months, and Apparent Water Heater every 2 months. Most recently, uSpectrum PAR was updated on October 21, 2026 and Apparent Water Heater on October 30, 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.*