# Polar Flow vs JetBlack Trainer

The clearest difference is rating: Polar Flow at 4.6 against JetBlack Trainer's 2.6. Polar Flow also leads on review sentiment (50% vs 11%) and ads (none vs shown). JetBlack Trainer's advantage is in-app purchases (none vs 1) and iOS requirement (12.2 vs 17.0). On price and device support there is nothing between them.

Both are free to download. Polar Flow sells 1 in-app purchase, starting at $8.99 per month. JetBlack Trainer asks for nothing beyond the download.

Polar Flow holds the better App Store score, 4.6 against 2.6. That said, the two scores are not equally well evidenced: Polar Flow has 50K ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 50% of Polar Flow's written reviews are positive against 11% of JetBlack Trainer's.

Polar Flow ships an update monthly, JetBlack Trainer every 7 months. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Polar Flow | JetBlack Trainer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (50K ratings)](https://appshunter.io/ios/app/polar-flow/id717172678/reviews)** | [2.6 (5 ratings)](https://appshunter.io/ios/app/jetblack-trainer/id1595969097/reviews) |
| Number of ratings | **50K** | 5 |
| Positive reviews | **49.6% of reviews** | 11.1% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Monthly** | Every 7 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 189 MB | 153 MB |
| Requires iOS | 17.0 | **12.2** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Polar Electro](https://appshunter.io/developer/532468555) | [JetBlack Products Pty Ltd](https://appshunter.io/developer/1181803244) |

## What reviewers say

### Polar Flow

[App page](https://appshunter.io/ios/app/polar-flow/id717172678)

This app helps you track daily activity, analyze workouts with detailed metrics, and gain insights into sleep patterns and recovery. It allows for device management, route planning, and seamless syncing with other popular fitness platforms.

**Highlights:** Activity Tracking, Training Analysis, Sleep Insights, Training Load & Recovery, Device & Profile Management, Wireless Syncing, Third-Party Service Integration

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Polar Fitness Program | $8.99 | per month |

**What reviewers like**

- 🚀 Accurate heart rate monitoring
- 🔋 Good battery life
- 👍 Detailed workout data and analysis
- 👍 Intuitive and user-friendly app
- 👍 Seamless syncing with Polar devices

**What reviewers complain about**

- 🐛 Connectivity and syncing issues
- 🐛 Unreliable sleep tracking
- 🐛 Slow GPS initialization
- 👎 Cluttered and confusing app interface
- 👎 Limited customization options

**Reported bugs**

- App crashes during syncing
- Inconsistent data sync between watch and app
- Firmware updates causing loss of user data

**Requested features**

- Ability to manually edit workout data
- Integration with more third-party apps
- More advanced training programs and coaching
- Improved sleep tracking and analysis


### JetBlack Trainer

[App page](https://appshunter.io/ios/app/jetblack-trainer/id1595969097)

Connect and manage your smart cycling trainer with this app. Designed by a professional coach, it helps you optimize your training sessions. Compatible with various Apple devices.

**Highlights:** Connect and manage smart trainer, Designed by professional coach, Optimize training sessions, Compatible with iPhone, iPad, iPod

**In-app purchases:** none


## Frequently asked questions

### Is Polar Flow free?

Polar Flow is free to download, with in-app purchases available.

### Is JetBlack Trainer free?

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

### Which has better reviews, Polar Flow or JetBlack Trainer?

Polar Flow is rated higher. Polar Flow averages 4.6 out of 5 from 50K ratings, while JetBlack Trainer averages 2.6 from 5 ratings.

### Do Polar Flow or JetBlack Trainer have ads?

JetBlack Trainer shows ads; Polar Flow does not.

### Which is updated more often, Polar Flow or JetBlack Trainer?

Polar Flow ships an update monthly, and JetBlack Trainer every 7 months. Most recently, Polar Flow was updated on October 29, 2026 and JetBlack Trainer on October 24, 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.*