# Sunbathe vs PISON

The clearest difference is in-app purchases: PISON at none against Sunbathe's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Sunbathe sells 1 in-app purchase, starting at $3.99 per month. PISON asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on June 4, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Sunbathe | PISON |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (7 ratings)](https://appshunter.io/ios/app/pison/id6475786964/reviews)** |
| Number of ratings | — | **7** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Freemium | **Free** |
| Size | 43 MB | 64 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Julia Alvarez de Eulate Sainz](https://appshunter.io/developer/1662471073) | [Pison Technology](https://appshunter.io/developer/1705268860) |

## What reviewers say

### Sunbathe

[App page](https://appshunter.io/ios/app/sunbathe/id6449760948)

This app helps you understand your vitamin D needs and how to get enough through safe sun exposure. It calculates optimal sunning times and duration based on your location to prevent deficiency and related health issues.

**Highlights:** Vitamin D deficiency information, Optimal sun exposure timing, Personalized duration calculations, Location-based recommendations, Health benefit insights

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sunbathe Premium | $3.99 | per month |


### PISON

[App page](https://appshunter.io/ios/app/pison/id6475786964)

This app provides insights into your cognitive and physical performance using data from compatible smartwatches. It helps you understand readiness, mental agility, and focus, with advanced metrics for sleep, stress, and health available through membership tiers.

**Highlights:** Cognitive performance metrics (Readiness, Agility, Focus), Sleep and fatigue tracking, Stress and health monitoring, Fitness metrics (respiratory rate, calories), Community leaderboards and groups, Insights from neural sensor technology

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

**In-app purchases:** none


## Frequently asked questions

### Is Sunbathe free?

Sunbathe is free to download, with in-app purchases available.

### Is PISON free?

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

### Do Sunbathe or PISON have ads?

Neither Sunbathe nor PISON shows ads.

### Which is updated more often, Sunbathe or PISON?

Sunbathe ships an update every 3 weeks, and PISON every 3 weeks. Most recently, Sunbathe was updated on June 4, 2026 and PISON on September 23, 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.*