# Barometer Plus vs KWMSYS

The clearest difference is in-app purchases: KWMSYS at none against Barometer Plus's 4. KWMSYS also leads on ads (none vs shown). Barometer Plus's advantage is update cadence (every 6 weeks vs every 4 months) and iOS requirement (13.0 vs 15.6). On price and device support there is nothing between them.

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

Barometer Plus ships an update every 6 weeks, KWMSYS every 4 months. The most recent releases landed on October 20, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Barometer Plus | KWMSYS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (409 ratings)](https://appshunter.io/ios/app/barometer-plus-altimeter/id1071044152/reviews)** | — |
| Number of ratings | **409** | — |
| Positive reviews | 63.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 6 weeks** | Every 4 months |
| Monetization | Free with in-app purchases | — |
| Size | 40 MB | 56 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ngo Na](https://appshunter.io/developer/1061345952) | [KWMSys GmbH](https://appshunter.io/developer/1796360432) |

## What reviewers say

### Barometer Plus

[App page](https://appshunter.io/ios/app/barometer-plus-altimeter/id1071044152)

This app measures air pressure and altitude using your device's built-in sensor. It helps predict weather changes, monitor health impacts of pressure fluctuations, and optimize activities like fishing. Customize its appearance and receive notifications about significant pressure shifts.

**Highlights:** Barometer and altimeter with analog display, Temperature and humidity readings, Pressure and altitude unit conversion, GPS and airport data calibration, Relative altitude measurement, Pressure change notifications, History tracking and graph

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| No Ads, Widget and Export | $0.99 | one-time |
| Unlimited custom rules | $0.99 | one-time |
| Exact update interval | $1.99 | one-time |
| Platinum Edition | $3.99 | one-time |

**What reviewers like**

- 🚀 Accurate
- 👍 Easy to use
- 🔍 Helpful for tracking migraines/arthritis
- 💡 Customizable settings
- 🔍 Useful for weather/fishing/aviation

**What reviewers complain about**

- 🐛 Inaccurate readings
- 📺 Intrusive ads
- 🔒 Privacy concerns with fitness tracking
- 🔋 Drains battery
- 🤔 Confusing interface

**Reported bugs**

- Stops tracking pressure changes
- Incompatible with iOS 10 on iPads
- Freezes or crashes on launch

**Requested features**

- Pressure trend indicators
- Customizable graphs and data export
- Notifications for pressure changes
- Arthritis/migraine warning indicators


### KWMSYS

[App page](https://appshunter.io/ios/app/kwmsys/id6742019317)

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

**In-app purchases:** none


## Frequently asked questions

### Is Barometer Plus free?

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

### Is KWMSYS free?

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

### Do Barometer Plus or KWMSYS have ads?

Barometer Plus shows ads; KWMSYS does not.

### Which is updated more often, Barometer Plus or KWMSYS?

Barometer Plus ships an update every 6 weeks, and KWMSYS every 4 months. Most recently, Barometer Plus was updated on October 20, 2026 and KWMSYS on October 1, 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.*