# Sunlighten vs Caldera® Spas

Sunlighten and Caldera® Spas both sit at 2.7 stars, but that hides the real split: 20% of Sunlighten's written reviews are positive against 0% of Caldera® Spas's. Sunlighten also leads on ratings volume (85 vs 5) and iOS requirement (15.1 vs 18.0). On price, rating, update cadence 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 — 2.7 for Sunlighten against 2.6 for Caldera® Spas. That said, the two scores are not equally well evidenced: Sunlighten has 85 ratings behind it against 5, so its average is the more settled of the two. Written reviews are what separate them: 20% of Sunlighten's written reviews are positive against 0% of Caldera® Spas's.

Sunlighten ships an update every 4 months, Caldera® Spas every 3 months. The most recent releases landed on October 23, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Sunlighten | Caldera® Spas |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.7 (85 ratings)](https://appshunter.io/ios/app/sunlighten/id1634410434/reviews)** | [2.6 (5 ratings)](https://appshunter.io/ios/app/caldera-spas/id6502303368/reviews) |
| Number of ratings | **85** | 5 |
| Positive reviews | **19.8% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 53 MB | 48 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [Sunlighten Inc](https://appshunter.io/developer/1634410436) | [Watkins Manufacturing Corporation](https://appshunter.io/developer/662341471) |

## What reviewers say

### Sunlighten

[App page](https://appshunter.io/ios/app/sunlighten/id1634410434)

Optimize your well-being with this app, designed to enhance your light therapy and sauna experiences. Create personalized wellness programs, track sessions in real-time, and control your devices remotely for a seamless health journey.

**Highlights:** Science-based wellness programs, Personalized program creation, Real-time session tracking, Remote sauna control (Wi-Fi), Audio and lighting management, Red light therapy panel programs

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

**In-app purchases:** none

**What reviewers like**

- 🚀 Convenient remote control
- 👍 Customizable programs
- 🚀 Easy to use app
- 👍 Enhances sauna experience

**What reviewers complain about**

- 🐛 Unreliable app connectivity
- 🔒 Privacy concerns with data collection
- 🐛 Inconsistent scheduling and remote start
- 🐛 Buggy and glitchy app
- 👎 Limited remote functionality

**Reported bugs**

- App fails to connect to sauna
- Scheduled programs not running as expected
- Inconsistent lighting controls
- Tablet frequently restarts or loses connection

**Requested features**

- Remote start and preheat capability
- Improved app stability and reliability
- Better integration between app and sauna
- More customization options


### Caldera® Spas

[App page](https://appshunter.io/ios/app/caldera-spas/id6502303368)

Remotely manage your spa's lighting, jets, and temperature. Monitor energy saving modes and cleaning cycles for an enhanced spa experience. Enjoy 24/7 AI support for peace of mind.

**Highlights:** Remote control of lighting, jets, and temperature, Manage Clean Cycle and Energy Saving Modes, Control FreshWater® IQ with dosing, 24/7 AI support, Monitor spa from anywhere

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

**In-app purchases:** none


## Frequently asked questions

### Is Sunlighten free?

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

### Is Caldera® Spas free?

Caldera® Spas is free to download, with no in-app purchases.

### Which has better reviews, Sunlighten or Caldera® Spas?

Sunlighten is rated higher. Sunlighten averages 2.7 out of 5 from 85 ratings, while Caldera® Spas averages 2.6 from 5 ratings.

### Do Sunlighten or Caldera® Spas have ads?

Neither Sunlighten nor Caldera® Spas shows ads.

### Which is updated more often, Sunlighten or Caldera® Spas?

Sunlighten ships an update every 4 months, and Caldera® Spas every 3 months. Most recently, Sunlighten was updated on October 23, 2026 and Caldera® Spas on October 25, 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.*