# Flat Habits vs Sunbathe

The clearest difference is price: Sunbathe at Free against Flat Habits's $5.99. Sunbathe also leads on review sentiment (100% vs 88%). Flat Habits's advantage is in-app purchases (none vs 1) and update cadence (every 9 days vs every 3 weeks). On ads, device support and iOS requirement there is nothing between them.

Sunbathe is free to download; Flat Habits costs $5.99 up front. Sunbathe sells 1 in-app purchase, starting at $3.99 per month. Flat Habits asks for nothing beyond the download.

Flat Habits ships an update every 9 days, Sunbathe every 3 weeks. The most recent releases landed on October 15, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Flat Habits | Sunbathe |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Rating | **[4.9 (57 ratings)](https://appshunter.io/ios/app/flat-habits/id1558358855/reviews)** | — |
| Number of ratings | **57** | — |
| Positive reviews | 87.5% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 3 weeks |
| Monetization | **Free** | Freemium |
| Size | 2 MB | 43 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Xenodium Ltd.](https://appshunter.io/developer/304568690) | [Julia Alvarez de Eulate Sainz](https://appshunter.io/developer/1662471073) |

## What reviewers say

### Flat Habits

[App page](https://appshunter.io/ios/app/flat-habits/id1558358855)

Track daily or weekly habits with a focus on privacy and ease of use. Receive timely notifications and quickly log progress directly from alerts. Review your streaks and commitment, with options for offline use and data export.

**Highlights:** Set daily/weekly habits, Due habit notifications, Quick notification actions, Review day streaks, Offline use, Export habit data, Org mode compatible

**Features:** Vision Pro support

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Flat Habits free?

Flat Habits costs $5.99, with no in-app purchases.

### Is Sunbathe free?

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

### Do Flat Habits or Sunbathe have ads?

Neither Flat Habits nor Sunbathe shows ads.

### Which is updated more often, Flat Habits or Sunbathe?

Flat Habits ships an update every 9 days, and Sunbathe every 3 weeks. Most recently, Flat Habits was updated on October 15, 2026 and Sunbathe on October 7, 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.*