Comparison

Polar Flow vs Acetrack

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

Head to head
About

Polar Flow

This app helps you track your daily activity, analyze workouts with detailed data, and gain insights into your sleep and recovery. It integrates with Polar devices and other fitness services to provide personalized guidance for your health and fitness journey.

Highlights
  • Activity Tracking (steps, calories, distance)
  • Detailed Training Analysis (heart rate, pace, power)
  • Advanced Sleep Insights
  • Training Load & Recovery Recommendations
  • Device and Sports Profile Management
  • Wireless Syncing with Polar Devices
  • Integration with Strava, TrainingPeaks, and more
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

About

Acetrack

Monitor your body's fat-burning rate with a portable breathalyzer device and companion app. Discover how diet, exercise, sleep, and stress impact your metabolic state. Make informed lifestyle choices for improved health.

Highlights
  • Track fat burning rate
  • Analyze ketosis levels
  • Understand lifestyle impacts
  • Support for various diets
  • Personalized metabolic insights
Features
Read full description

Tracking your fat burning rate is as simple as breathing. All you need is this app and our pocket-friendly device, Acetrack. How do factors like diet, training, mood, stress or sleep affect your fat burning? Use the Acetrack app to find out. Acetrack — a good friend on the metabolic journey towards better health: Measure your fat burning rate wherever you are. Find out what affects your level of ketosis. Make more informed dietary decisions. Trace the impact of your lifestyle choices. Do you have to follow a ketogenic diet to use Acetrack? Not at all. Breath acetone measurements are useful for all types of diets that boost your metabolism. Keto, low-carb, paleo, vegan, Atkins, fasting, zero carb, pescatarian, carnivore... Understand your unique metabolism with Acetrack Understanding your own body and rate of fat burning will help you make better dietary choices. Learn what happens in your body throughout the day, week and month with Acetrack.

Screenshots

Polar Flow4 screens
Acetrack4 screens

Verdict

The call

The clearest difference is review sentiment: Polar Flow at 50% against Acetrack's 0%. Polar Flow also leads on rating (4.6 vs 3.0) and ads (none vs shown). Acetrack's advantage is in-app purchases (none vs 1) and iOS requirement (11.0 vs 17.0). On price and device support 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. Acetrack asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

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 point the same way: 50% of Polar Flow's written reviews are positive against 0% of Acetrack's.

UpkeepUpdate frequency

Polar Flow ships an update monthly, Acetrack every 3 months. The most recent releases landed on November 12, 2026 and November 2, 2026 respectively.

Scorecard8 real differences · 2 level
Polar Flow versus Acetrack: the parameters behind the verdict, then further details
ParameterPolar FlowAcetrack
PriceFreeFree
Rating4.6 (50K ratings) — better3.0 (2 ratings)
Positive reviews49.7% of reviews — better0.0% of reviews
Number of ratings50K — better2
Update frequencyMonthly — betterEvery 3 months
AdsNo — betterYes
In-app purchasesYesNo — better
MonetizationFreemiumAd-supported — better
DevicesiPhone, iPadiPhone, iPod
Requires iOS17.011.0 — better
Further details — not scored
Size191 MB11 MB
Age rating4+12+
DeveloperPolar ElectroDeversify

Customer experience

Polar Flow

All ratings50,319 ratings
Positive91.2%
Neutral4.5%
Negative4.3%
Written reviews2,229 reviews
Positive49.7%
Neutral11.3%
Negative39.1%

Acetrack

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Bugs and requests

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

Acetrack

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Polar Flow

Subscriptions1
  • Polar Fitness Program1 Month trial$8.991 Month
None

Acetrack

No in-app purchases

Questions

Is Polar Flow free?
Polar Flow is free to download, with in-app purchases available.
Is Acetrack free?
Acetrack is free to download, with no in-app purchases.
Which has better reviews, Polar Flow or Acetrack?
Polar Flow is rated higher. Polar Flow averages 4.6 out of 5 from 50K ratings, while Acetrack averages 3.0 from 2 ratings.
Do Polar Flow or Acetrack have ads?
Acetrack shows ads; Polar Flow does not.
Which is updated more often, Polar Flow or Acetrack?
Polar Flow ships an update monthly, and Acetrack every 3 months. Most recently, Polar Flow was updated on November 12, 2026 and Acetrack on November 2, 2026.

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