# Frontier X vs PRO SKI Sensor

The clearest difference is price: Frontier X at Free against PRO SKI Sensor's $0.99. PRO SKI Sensor's advantage is in-app purchases (none vs 2). On update cadence, ads, device support and iOS requirement there is nothing between them.

Frontier X is free to download; PRO SKI Sensor costs $0.99 up front. Frontier X sells 2 in-app purchases, starting at $14.99 per month. PRO SKI Sensor asks for nothing beyond the download.

Frontier X ships an update every 3 weeks, PRO SKI Sensor monthly. The most recent releases landed on October 12, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | Frontier X | PRO SKI Sensor |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.6 (318 ratings)](https://appshunter.io/ios/app/frontier-x/id1483444499/reviews)** | — |
| Number of ratings | **318** | — |
| Positive reviews | 81.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | Free with in-app purchases | — |
| Size | 569 MB | 102 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | iPhone, Apple Watch | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Fourthfrontier](https://appshunter.io/developer/1331846764) | [PRO SENSOR DEVELOPMENT SL.](https://appshunter.io/developer/1489712292) |

## What reviewers say

### Frontier X

[App page](https://appshunter.io/ios/app/frontier-x/id1483444499)

Track your heart health and exercise performance with a smart chest strap monitor. Gain detailed insights into heart rate, rhythms, and training load. Receive personalized feedback and alerts to optimize your workouts and understand your body better.

**Highlights:** Heart Health Monitoring, Real-time Heart Rate & HRV, Breathing Rate & Strain Tracking, Activity Recording (24hrs), Personalized Vibration Alerts, AI-enabled Training Insights, Metabolic Profile Analytics (Premium)

**Features:** Apple Watch app

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $14.99 | per month |
| Yearly | $119.99 | per year |

**What reviewers like**

- 🚀 Amazing device
- 👍 Great HR data and insight
- 👍 Helpful in gaining more data
- 👍 Fantastic concept with excellent execution
- 👍 Loads of useful information

**What reviewers complain about**

- 🐛 Worse and worse as time goes by
- 🐛 ECG doesn't work
- 🐛 Chest strap issues, device keeps popping out
- 🐛 Paywalled functionality
- 🐛 Syncing issues, device keeps disconnecting

**Reported bugs**

- ECG stopped working
- Inaccurate breathing rate and other metrics
- Inability to edit activity details for indoor workouts
- Syncing issues with Garmin devices after firmware updates

**Requested features**

- Add interval markers
- Improve integration with Apple Fitness/Fitness+
- Add support for ANT+
- Improve compatibility with other fitness apps and devices
- Add more customization options for workouts


### PRO SKI Sensor

[App page](https://appshunter.io/ios/app/pro-ski-sensor/id1489712293)

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

**In-app purchases:** none


## Frequently asked questions

### Is Frontier X free?

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

### Is PRO SKI Sensor free?

PRO SKI Sensor costs $0.99, with no in-app purchases.

### Do Frontier X or PRO SKI Sensor have ads?

Neither Frontier X nor PRO SKI Sensor shows ads.

### Which is updated more often, Frontier X or PRO SKI Sensor?

Frontier X ships an update every 3 weeks, and PRO SKI Sensor monthly. Most recently, Frontier X was updated on October 12, 2026 and PRO SKI Sensor on September 26, 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.*