Barometer & Altimeter vs ONI system
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Barometer & Altimeter
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.
- 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
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HowHigh is a free barometer and altimeter toolkit for following altitude and air-pressure changes. See live readings, record sessions, and compare history on iPhone and iPad—without a subscription. USE HOWHIGH TO: - View live pressure, altitude, rate of change, elevation gain, and sea-level adjustments. - Record hikes, climbs, hills, stairs, weather observations, and experiments. - Review session history, compare recordings, and explore interactive charts. - Share results or export recorded data as CSV. - Choose manual calibration, optional WeatherKit calibration, or nearby NWS station calibration where supported. - See the active measurement source and sensor-confidence context alongside each reading. - Switch between metric and imperial units. Your recorded sessions stay on your device until you choose to share or export them. Core readings and saved history remain available offline; online calibration sources require a connection. HowHigh is designed for everyday observation and exploration. It does not replace certified instruments or safety-critical guidance. Track how altitude and air pressure change over time—all core features are free.
ONI system
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.
- View asset lists
- Real-time asset positions
- Google traffic near assets
- Logbook of trips
- Asset route history
- Navigation to asset location
- Detailed asset states
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The ONI system app displays the most important assets data. After login in the ONI system you gain access to view: - lists of assets, - actual assets positions, - Google traffic near the asset, - list of trips (logbook), - routes driven by the asset, - navigation to the actual asset's position, - detailed states of the asset (e.g. temperature, battery charge level, trip type etc.).
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Barometer & Altimeter | ONI system |
|---|---|---|
| Price | Free | Free |
| Rating | 2.3 (25 ratings) — better | — |
| Positive reviews | 57.1% of reviews — better | 33.3% of reviews |
| Number of ratings | 25 — better | — |
| Update frequency | Every 10 days — better | Every 6 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Requires iOS | 16.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 7 MB | 90 MB |
| Age rating | 4+ | 4+ |
| Developer | Thirty Seven Inc. | NAM system a.s. |
Customer experience
Barometer & Altimeter
ONI system
In-app purchases
Barometer & Altimeter
No in-app purchases
ONI system
No in-app purchases
