# ErgData vs Polar Flow

The clearest difference is in-app purchases: ErgData at none against Polar Flow's 1. Polar Flow's advantage is ratings volume (50K vs 5.1K). On price, rating, review sentiment and update cadence there is nothing between them.

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

On the App Store both sit at effectively the same score — 4.7 for ErgData against 4.6 for Polar Flow. That said, the two scores are not equally well evidenced: Polar Flow has 50K ratings behind it against 5.1K, so its average is the more settled of the two. Written reviews are what separate them: 45% of ErgData's written reviews are positive against 49% of Polar Flow's.

ErgData ships an update every 2 weeks, Polar Flow monthly. The most recent releases landed on September 29, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | ErgData | Polar Flow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (5.1K ratings)](https://appshunter.io/ios/app/ergdata/id561716382/reviews)** | [4.6 (50K ratings)](https://appshunter.io/ios/app/polar-flow/id717172678/reviews) |
| Number of ratings | 5.1K | **50K** |
| Positive reviews | 45.4% of reviews | **49.4% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Monthly |
| Monetization | **Free** | Free with in-app purchases |
| Size | 74 MB | 189 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Concept2, Inc.](https://appshunter.io/developer/446481798) | [Polar Electro](https://appshunter.io/developer/532468555) |

## What reviewers say

### ErgData

[App page](https://appshunter.io/ios/app/ergdata/id561716382)

This app acts as a personal training partner for Concept2 equipment. It allows users to set up custom workouts, view real-time stats, track progress, and sync data with online platforms. It also offers workout of the day challenges and detailed post-workout analysis.

**Highlights:** Custom workout setup, Real-time workout stats, Progress tracking, Sync with Concept2 Logbook, Workout of the Day, Post-workout analysis, Apple Watch compatibility

**Features:** Apple Watch app

**In-app purchases:** none

**What reviewers like**

- 🚀 Great app
- 👍 Excellent stats
- 👍 Easy to use
- 👍 Seamless sync with Concept2 logbook
- 👍 Customizable heart rate zones

**What reviewers complain about**

- 🐛 Connection issues with PM5
- 🐛 Unreliable heart rate monitoring
- 🐛 Sync issues with Apple Health
- 🐛 Crashes and data loss
- 🐛 Frequent disconnections

**Reported bugs**

- Workout data not saving
- Heart rate data freezing
- Disconnects during workouts
- Sync issues with Apple Health and Strava
- Login issues and frequent logouts

**Requested features**

- Add friend mode
- Integrate Apple Watch support
- Add manual workout entry
- Implement landscape mode for iPad
- Integrate pace calculator


### 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


## Frequently asked questions

### Is ErgData free?

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

### Is Polar Flow free?

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

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

ErgData is rated higher. ErgData averages 4.7 out of 5 from 5.1K ratings, while Polar Flow averages 4.6 from 50K ratings.

### Do ErgData or Polar Flow have ads?

Neither ErgData nor Polar Flow shows ads.

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

ErgData ships an update every 2 weeks, and Polar Flow monthly. Most recently, ErgData was updated on September 29, 2026 and Polar Flow on October 1, 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.*