# Barometer & Altimeter vs ONI system

The clearest difference is review sentiment: Barometer & Altimeter at 57% against ONI system's 33%. Barometer & Altimeter also leads on update cadence (every 10 days vs every 6 weeks). ONI system's advantage is iOS requirement (13.0 vs 16.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Barometer & Altimeter ships an update every 10 days, ONI system every 6 weeks. The most recent releases landed on September 9, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Barometer & Altimeter | ONI system |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.3 (25 ratings)](https://appshunter.io/ios/app/barometer-and-altimeter-howhigh/id921339656/reviews)** | — |
| Number of ratings | **25** | — |
| Positive reviews | **57.1% of reviews** | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 6 weeks |
| Monetization | Free | Free |
| Size | 7 MB | 90 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Thirty Seven Inc.](https://appshunter.io/developer/554594255) | [NAM system a.s.](https://appshunter.io/developer/1156895479) |

## What reviewers say

### Barometer & Altimeter

[App page](https://appshunter.io/ios/app/barometer-and-altimeter-howhigh/id921339656)

This app provides precise barometer and altimeter readings with live data, session recording, and historical analysis. It features automatic device calibration and supports various Apple devices and accessibility features.

**Highlights:** Dual barometer and altimeter dashboards, Real-time pressure and elevation readings, Session recording with rich datasets, Interactive Swift Charts for analysis, Automatic device calibration, Optional WeatherKit sea-level calibration

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

**In-app purchases:** none


### ONI system

[App page](https://appshunter.io/ios/app/oni-system/id1156895480)

Access and view crucial asset data, including lists, real-time positions, and traffic information. Track trips, view routes, and get detailed asset states like temperature and battery levels. Navigate directly to asset locations.

**Highlights:** View asset lists, Real-time asset positions, Google traffic near assets, Logbook of trips, Asset route history, Navigation to asset location, Detailed asset states

**In-app purchases:** none


## Frequently asked questions

### Is Barometer & Altimeter free?

Barometer & Altimeter is free to download, with no in-app purchases.

### Is ONI system free?

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

### Do Barometer & Altimeter or ONI system have ads?

Neither Barometer & Altimeter nor ONI system shows ads.

### Which is updated more often, Barometer & Altimeter or ONI system?

Barometer & Altimeter ships an update every 10 days, and ONI system every 6 weeks. Most recently, Barometer & Altimeter was updated on September 9, 2026 and ONI system on September 14, 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.*