Best O2 Circuit Training Apps

206+ iOS apps curated and reviewed

4.2 avg rating
20 free apps
Updated June 2026

Whether you're new to o2 circuit training or looking for an upgrade, our curated collection of 206+ iOS apps has something for everyone. Each app is reviewed and rated by real users, helping you make an informed decision.

Top Picks for O2 Circuit Training

Interval Timer#2

Interval Timer by HIIT Apps Sp. z o.o.

Tabata, HIIT, Circuit Training
Strong Contender
💪 Health & Fitness
4.7😊(3.2K ratings)
FreeIn-App Purchases
Interval Timer screenshot 1
Interval Timer screenshot 2
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This app is a versatile interval timer designed for various training styles like Tabata and HIIT. It offers customizable workout parameters, voice guidance, and music ducking for an enhanced training experience. Save your custom workouts and track your progress.

What We Love

  • 👍 Easy to use
  • 🚀 Customizable workouts
  • 🚀 Versatile and efficient
  • 🚀 Helpful voice prompts

Room to Improve

  • 🐛 Bugs causing lost workouts
  • 🔋 High battery consumption
  • 💰 Subscription-based model
TrainerRoad#3

TrainerRoad by Trainer Road, LLC

Cycling Training App
Worth Considering
💪 Health & Fitness
4.9😊(21K ratings)
FreeAdsIn-App Purchases
TrainerRoad screenshot 1
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This app offers intelligent cycling and triathlon training plans that adapt to your performance, schedule, and goals. It provides daily workout recommendations, instant analysis, and over 3,000 structured workouts to help you become a faster cyclist.

What We Love

  • 🚀 Makes Training Dead Simple
  • 🚀 Continual Improvement
  • 🚀 Excellent Training Platform
  • 🚀 Transformational and Uplifting

Room to Improve

  • 🐛 Horrible App, Constantly Crashing
  • 🐛 App is Always Slow and Buggy
  • 🔋 Expensive Compared to Alternatives

More O2 Circuit Training apps to explore

4
ICG Training
ICG Training
ICG Training
Your Powerful Personal Trainer
Free

This app serves as a personal trainer, offering a variety of expertly designed workouts for home, gym, or cycling classes. It features a unique color-coded system for easy zone tracking and allows users to create, customize, and share workouts, while also syncing data with external fitness apps.

Coach By Color® SystemExpertly designed free workoutsCreate and share custom workouts
💪 Health & Fitness
(2.2K)
free with in-app purchases
5
TrainingPeaks: Plan Train Lift
TrainingPeaks: Plan Train Lift
TrainingPeaks: Plan Train Lift
Triathlon, Cycling, Running
Free

This app offers a comprehensive platform for athletes and coaches to plan, track, and analyze training for endurance sports and strength building. It provides flexible scheduling, actionable insights, and integrated strength training to optimize performance and durability.

Flexible training planningActionable data insightsIntegrated strength training
💪 Health & Fitness
(13K)
free with in-app purchases
6
Fresh Start Training
Fresh Start Training
Fresh Start Training
short bursts of training
Free

Engage in brief, personalized training sessions lasting only 3-5 minutes. Earn rewards, access job aids, and track your knowledge growth. Managers gain insights into team performance and can trigger targeted training.

Personalized daily trainingGamified learning with rewardsAccess to job aids and resources
💼 Business
(122)
free
7
Circuit Training Timer Lite
Circuit Training Timer Lite
Circuit Training Timer Lite
Time and track your workouts
Free

This app coaches your workouts with customizable timers, allowing you to focus on training. It supports location tracking for detailed statistics and heart rate monitoring with Bluetooth LE devices. Voice coaching and clear visual cues keep you informed without needing to check your screen.

Customizable interval timersLocation tracking for statsBluetooth LE heart rate monitor support
💪 Health & Fitness
(449)
free with in-app purchases
8
Wahoo SYSTM
Wahoo SYSTM
Wahoo SYSTM
Complete indoor training app
Free

This app provides structured indoor training for cyclists, adapting workouts to your strengths and goals. It offers a variety of motivating content, personalized recommendations, and integrates with your own gear for a comprehensive fitness experience.

Personalized Rider Profile (4DP)Daily workout recommendationsExtensive workout library (The Sufferfest, ProRides)
💪 Health & Fitness
(2.6K)
free with in-app purchases
9
Tacx Training™
Tacx Training™
Tacx Training™
Outdoor cycling indoors
Free

Transform indoor cycling into immersive outdoor experiences. Connect to a smart trainer to simulate real-world terrain and track performance data. Enjoy virtual rides, challenges, and sync with other devices for comprehensive training.

Simulate real-world climbs and descentsReal-time speed, power, and cadence dataAutomatic trainer resistance adjustment
💪 Health & Fitness
(16K)
freemium
10
iBiker Cycling & Heart Trainer
iBiker Cycling & Heart Trainer
iBiker Cycling & Heart Trainer
Do heart rate training right!
Free

Track your indoor and outdoor cycling workouts with detailed metrics like distance, speed, and heart rate. Offers voice coaching, route planning, and social features. Supports various activities and integrates with popular health platforms and heart rate monitors.

Heart rate monitor tracking and trainingGPS routes for outdoor workoutsCustomizable voice coaching
⚽ Sports
(1.6K)
freemium
11
Training Connect
Training Connect
Training Connect
Validate your NYC DOB TC Card
Free

This app allows users to validate NYC DOB TC Cards. It provides a quick and easy way to verify the authenticity of these important documents.

Validate NYC DOB TC CardsQuick verificationEasy to use interface
📊 Productivity
(43)
free
12
ElectroSim: Circuit Simulator
ElectroSim: Circuit Simulator
ElectroSim: Circuit Simulator
Electrical wiring simulator
Free

Design, build, and test realistic electrical circuits on your mobile device. This app offers real-time simulations, guided tutorials, and a library of expert-created circuits for hands-on learning. Practice wiring safely and effectively for vocational training or self-study.

Design and build electrical circuitsReal-time circuit simulationGuided wiring tutorials
📚 Education
(10)
freemium
13
Exercise Timer: Interval Timer
Exercise Timer: Interval Timer
Exercise Timer: Interval Timer
HIIT, Tabata, Circuit Training
Free

Create and guide custom interval training routines with this app. It supports timed and rep-based exercises, offers voice coaching, and logs your workout history with detailed analytics. Track progress over time and organize routines into training plans.

Custom workout routinesVoice coach for next exerciseTimed and rep-based exercises
💪 Health & Fitness
(929)
freemium
14
ErgData
ErgData
ErgData
by Concept2, Inc.
Free

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.

Custom workout setupReal-time workout statsProgress tracking
💪 Health & Fitness
(2.6K)
free
15
Final Surge
Final Surge
Final Surge
Running, Cycling & Triathlon
Free

This app helps endurance athletes, runners, cyclists, and triathletes manage their training. It offers features for planning, tracking workouts, and communicating with coaches or teams. Premium subscriptions unlock advanced analytics and tools.

Dark Theme & Custom IconsDynamic Font & NavigationCalendar Date Range & Labels
💪 Health & Fitness
(117)
free with in-app purchases
16
Morpheus Training
Morpheus Training
Morpheus Training
by Morpheus Labs INC
Free

This app optimizes cardio training and recovery by providing personalized heart rate zones and weekly targets. It uses HRV data to guide intensity and volume, helping users improve fitness and conditioning with zone-based interval training.

Personalized heart rate zonesCardioSmart featuresZone-based interval training (ZBIT)
💪 Health & Fitness
(146)
free with in-app purchases
17
Humango: AI Training Planner
Humango: AI Training Planner
Humango: AI Training Planner
Smarter Training, Every Day
Free

This app offers personalized, adaptive training plans for runners, cyclists, and triathletes. It uses AI to adjust workouts based on your goals, fitness level, and daily schedule, ensuring smarter training and better performance.

Adaptive AI CoachingPersonalized Running PlansCycling Training Programs
💪 Health & Fitness
(63)
free with in-app purchases
18
BodyGuardz Training
BodyGuardz Training
BodyGuardz Training
Capturing sales with training
Free

Enhance product knowledge and sales skills with this app. Scan product barcodes to access selling points, training videos, and quizzes. Earn free products by completing training modules.

Barcode product scanningAccess key selling pointsEngaging training videos
📊 Productivity
(35)
free
19
VO2 Master Manager
VO2 Master Manager
VO2 Master Manager
Record VO2, Heart Rate, Power
Free

This tool collects and displays performance data including VO2, heart rate, and power. It also monitors speed, cadence, and muscle oxygenation for comprehensive analysis.

VO2 monitoringHeart rate trackingPower data collection
💪 Health & Fitness
(9)
free
20
Stamina: Triathlon Training
Stamina: Triathlon Training
Stamina: Triathlon Training
Sprint, Olympic, Half, Full
Free

Generate personalized triathlon training plans that adapt to your lifestyle and goals. Sync workouts to your device, get insights from coaches, and track your progress for any race distance.

Personalized training plansAdaptive workout adjustmentsGarmin device synchronization
💪 Health & Fitness
(24)
free with in-app purchases