# Polar Flow vs ImersU

The clearest difference is rating: Polar Flow at 4.6 against ImersU's 3.0. Polar Flow also leads on ratings volume (50K vs 2). ImersU's advantage is in-app purchases (none vs 1) and review sentiment (60% vs 50%). On price, update cadence and ads there is nothing between them.

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

Polar Flow holds the better App Store score, 4.6 against 3.0. That said, the two scores are not equally well evidenced: Polar Flow has 50K ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 50% of Polar Flow's written reviews are positive against 60% of ImersU's, so the app with the better star average is not the one people write more warmly about.

Polar Flow ships an update monthly, ImersU every 2 weeks. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Polar Flow | ImersU |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (50K ratings)](https://appshunter.io/ios/app/polar-flow/id717172678/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/imersu/id6444767962/reviews) |
| Number of ratings | **50K** | 2 |
| Positive reviews | 49.6% of reviews | **60.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 189 MB | 259 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Polar Electro](https://appshunter.io/developer/532468555) | [Immersive Gym Company Limited](https://appshunter.io/developer/1655703445) |

## 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


### ImersU

[App page](https://appshunter.io/ios/app/imersu/id6444767962)

Experience indoor rowing like never before with virtual, real-world courses. Train or race against AI, customize your environment, and connect with your rowing machine for an immersive fitness journey.

**Highlights:** Virtual real-world rowing courses, Customizable time of day and weather, AI boat racing, Connects with rowing machines via Bluetooth FTMS, Flow Row mode for non-connected ergometers, Multi-screen display support

**In-app purchases:** none


## Frequently asked questions

### Is Polar Flow free?

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

### Is ImersU free?

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

### Which has better reviews, Polar Flow or ImersU?

Polar Flow is rated higher. Polar Flow averages 4.6 out of 5 from 50K ratings, while ImersU averages 3.0 from 2 ratings.

### Do Polar Flow or ImersU have ads?

Neither Polar Flow nor ImersU shows ads.

### Which is updated more often, Polar Flow or ImersU?

Polar Flow ships an update monthly, and ImersU every 2 weeks. Most recently, Polar Flow was updated on November 1, 2026 and ImersU on October 30, 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.*