# Barometer for Watch vs Marlin

The clearest difference is in-app purchases: Marlin at none against Barometer for Watch's 4. Marlin also leads on update cadence (every 5 weeks vs every 4 months) and iOS requirement (15.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. Barometer for Watch sells 4 one-off in-app purchases. Marlin asks for nothing beyond the download.

Barometer for Watch ships an update every 4 months, Marlin every 5 weeks. The most recent releases landed on October 24, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Barometer for Watch | Marlin |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (48 ratings)](https://appshunter.io/ios/app/barometer-for-watch/id1448485995/reviews)** | — |
| Number of ratings | **48** | — |
| Positive reviews | 63.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 5 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 8 MB | 37 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Bangyan Chu](https://appshunter.io/developer/1448485994) | [Tarek Almohamad](https://appshunter.io/developer/1854363231) |

## What reviewers say

### Barometer for Watch

[App page](https://appshunter.io/ios/app/barometer-for-watch/id1448485995)

This application displays atmospheric pressure, sea level pressure, and altitude using your device's built-in sensors. It also calculates the boiling point of water based on current pressure. The companion watch app includes customizable complications.

**Highlights:** Atmospheric pressure reading, Sea level pressure, Altitude measurement, Latitude and longitude, Boiling point calculation, Watch complications

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tips for coffee | $1.99 | one-time |
| Tips for Ice Cream | $2.99 | one-time |
| Tips for Pizza | $4.99 | one-time |
| Generous Tips | $10.99 | one-time |


### Marlin

[App page](https://appshunter.io/ios/app/marlin/id6755519257)

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

**In-app purchases:** none


## Frequently asked questions

### Is Barometer for Watch free?

Barometer for Watch is free to download, with in-app purchases available.

### Is Marlin free?

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

### Do Barometer for Watch or Marlin have ads?

Neither Barometer for Watch nor Marlin shows ads.

### Which is updated more often, Barometer for Watch or Marlin?

Barometer for Watch ships an update every 4 months, and Marlin every 5 weeks. Most recently, Barometer for Watch was updated on October 24, 2026 and Marlin on October 5, 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.*