Comparison

ErgData vs Polar Flow

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

ErgData

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
Read full description

ErgData from Concept2 is your personal training partner. Set up workouts from your phone or tablet, view customized stats and information during workouts, track your progress, sync with the Concept2 Online Logbook, take part in the Workout of the Day and much more. Features -Set up workouts from your phone, making it simple to create even the most complex of interval workouts. You can choose to store workouts as favorites or rerow past efforts straight from ErgData. -Set the Concept2 Workout of the Day on the monitor with a single tap. -Compatible with the Apple Watch. Watch users can now see real-time heart rate data on the screen during the workout and in analysis afterwards. -Choose from different workout display options, including small, medium and large data screens, a pace graph screen, an interval and split table or a pace boat. Easily swipe between screens during your workout. Customize the data shown to suit you. -Syncs with the Concept2 Online Logbook, making it easy for you to take part in our many challenges. From the Online Logbook, your workouts can get sent to platforms such as Strava, Garmin Connect or Training Peaks. -Detailed post-workout analysis helps you know exactly what happened during your workout. See all your interval and split data, as well as pace and rate graphs, plus how long you spent in each heart rate zone. -Optional voice guidance to send audible workout data and results. Technical Specifications -Compatible with the PM5. -Compatible with the Concept2 RowErg, SkiErg and BikeErg -Connects to Apple Health -Connects to PM5 via Bluetooth only Note: Please do not have a USB stick in the PM5 at the same time as using ErgData, as this may prevent workouts being saved.

About

Polar Flow

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
Read full description

Polar Flow: Your Personal Sports, Fitness, and Health Companion The exclusive app designed to maximize the potential of your Polar devices. Key Features: Activity Tracking: Monitor your daily activity, steps, calories burned, and distance to stay motivated throughout the day. Training Analysis: Dive deep into your workouts with detailed data on heart rate, speed, pace, distance, power, and more. Understand the impact of each session and optimize your training routines. Sleep Insights: Discover how well you sleep with advanced sleep tracking. Get feedback on sleep stages and quality to improve your rest and recovery. See how sleep boosts your day and track skin temperature changes. Training Load & Recovery: Understand how your training sessions strain your body and get recommendations on recovery time to prevent overtraining. Manage your watch and profile: Customize and manage your Polar device, Sports profiles for different activities, Routes, and Training Targets. Wireless Syncing: Automatically sync data from your Polar devices for real-time updates, notifications, and other insights. Stay Connected: Connect your profile and sync your data with Strava, TrainingPeaks, Adidas, komoot, and many other services. Why Choose Polar Flow? Personalized Guidance: Receive personalized feedback and guidance and understand your progress. Comprehensive Ecosystem: Integrates seamlessly with Polar watches, heart rate monitors, and more for a holistic experience. User-Friendly Interface: Navigate your data effortlessly with our intuitive and clean design. Notification support: Your Polar watch will receive the same notifications as your phone screen—incoming calls, messages, and app notifications. Secure and Private: Your data is safely stored and protected, giving you peace of mind as you focus on your journey. Polar Flow app allows you to share some of your wellness data with Apple Health. This includes details of your training, your heart rate, and steps. Please note Polar Flow app is not intended for medical or diagnostic use. Get Started Today! Download Polar Flow and unlock the full potential of your Polar devices. You can find more info at https://www.polar.com/flow Connect with us! Instagram: www.instagram.com/polarglobal Facebook: www.facebook.com/polarglobal YouTube: www.youtube.com/polarglobal Find out more about Polar products at https://www.polar.com/en/products

Screenshots

ErgData4 screens
Polar Flow4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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

Scorecard3 real differences · 7 level
ErgData versus Polar Flow: the parameters behind the verdict, then further details
ParameterErgDataPolar Flow
PriceFreeFree
Rating4.7 (5.1K ratings) — better4.6 (50K ratings)
Positive reviews45.4% of reviews49.4% of reviews — better
Number of ratings5.1K50K — better
Update frequencyEvery 2 weeks — betterMonthly
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, Apple Watch — betteriPhone, iPad
Requires iOS16.0 — better17.0
Further details — not scored
Size74 MB189 MB
Age rating4+4+
DeveloperConcept2, Inc.Polar Electro

Customer experience

ErgData

All ratings5,055 ratings
Positive93.0%
Neutral1.6%
Negative5.4%
Written reviews678 reviews
Positive45.4%
Neutral11.2%
Negative43.4%

Polar Flow

All ratings50,010 ratings
Positive91.3%
Neutral4.5%
Negative4.2%
Written reviews2,194 reviews
Positive49.4%
Neutral11.2%
Negative39.4%

User reviews

ErgData

From 5.1K App Store ratings

What we love

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

Room to improve

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

Polar Flow

From 50K App Store ratings

What we love

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

Room to improve

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

Bugs and requests

ErgData

Reported bugs

6 issues
  • Workout data not saving
  • Heart rate data freezing
  • Disconnects during workouts
  • Sync issues with Apple Health and Strava
  • Login issues and frequent logouts
Show 1 more
  • Incompatibility with older firmware versions

Requested features

8 requests
  • Add friend mode
  • Integrate Apple Watch support
  • Add manual workout entry
  • Implement landscape mode for iPad
  • Integrate pace calculator
Show 3 more
  • Add recovery heart rate tracking
  • Display METS data
  • Allow custom heart rate zones in logbook

Polar Flow

Reported bugs

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

Requested features

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

In-app purchases

None

ErgData

No in-app purchases

1 purchases

Polar Flow

Subscriptions1
  • Polar Fitness Program1 Month trial$8.991 Month

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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