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Best O2 Circuit Training Apps

247+ iOS apps curated and reviewed

4.0 avg rating
20 free apps
Updated August 2026

Whether you're new to o2 circuit training or looking for an upgrade, our curated collection of 247+ iOS apps has something for everyone. Each app is reviewed and rated by real users, helping you make an informed decision.

Compare top O2 Circuit Training Apps (August 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1O2 CIRCUIT TRAININGO2 CIRCUIT TRAININGFree—NoNoMay 2026
2Circuit Training Timer LiteCircuit Training Timer LiteFree4.8★ (449)NoYesJul 2026
3SimubusSimubusFree—NoYesJul 2026
4Circuit Training WorkoutCircuit Training WorkoutFree—YesYesMay 2026
5Interval TimerInterval TimerFree4.7★ (3.4K)NoYesAug 2026
6ElectroSim: Circuit SimulatorElectroSim: Circuit SimulatorFree4.3★ (40)NoYesAug 2026
7Fresh Start TrainingFresh Start TrainingFree2.0★ (122)NoNoAug 2026
8O2 — Breathing TrainerO2 — Breathing TrainerFree—NoYesJul 2026

Top Picks for O2 Circuit Training

Circuit Training Timer Lite#2

Circuit Training Timer Lite by DenciSoft s.r.o.

Time and track your workouts
Strong Contender
💪 Health & Fitness
4.8😊(449 ratings)
FreeIn-App Purchases
Circuit Training Timer Lite screenshot 1
Circuit Training Timer Lite screenshot 2
Circuit Training Timer Lite screenshot 3
Circuit Training Timer Lite screenshot 4
Circuit Training Timer Lite screenshot 5
Circuit Training Timer Lite screenshot 6

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.

What We Love

  • 👍 Highly customizable workouts
  • 🎶 Music integration
  • ⏱️ Flexible timer settings
  • 🔊 Voice prompts for exercises

Room to Improve

  • 🔋 Battery drain issues
  • 🔒 Limited functionality in free version
  • 🔇 Quiet audio prompts

More O2 Circuit Training apps to explore

4
Circuit Training Workout
Circuit Training Workout
Circuit Training Workout
At Home HIIT Circuit Workout
Free
💪 Health & Fitness
(0)
5
Interval Timer
Interval Timer
Interval Timer
Tabata, HIIT, Circuit Training
Free

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.

Customizable interval settingsVoice assistant with text-to-speechMusic ducking for audio integration
💪 Health & Fitness
(3.4K)
subscription
6
ElectroSim: Circuit Simulator
ElectroSim: Circuit Simulator
ElectroSim: Circuit Simulator
Wire, Switch, Relay & Motor
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
(40)
freemium
7
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
8
O2 — Breathing Trainer
O2 — Breathing Trainer
O2 — Breathing Trainer
Mindful Breathing & Meditation
Free
💪 Health & Fitness
(0)
9
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
(15)
free with in-app purchases
10
The Outsiders Fitness Tracker
The Outsiders Fitness Tracker
The Outsiders Fitness Tracker
Training Readiness & Recovery
Free

This app provides data-driven insights for self-coached athletes to optimize performance and recovery. It offers a daily readiness score, tracks training load and progress, and analyzes workouts with advanced metrics. Designed for runners, cyclists, and swimmers who prioritize informed training.

Daily Training Readiness scoreTraining load and recovery trackingPerformance progress monitoring
💪 Health & Fitness
(119)
free with in-app purchases
11
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
12
Gasket Circuit：Anchor Slate
Gasket Circuit：Anchor Slate
Gasket Circuit：Anchor Slate
by SUPAP PHUMITHAT
Free
🔧 Utilities
(0)
13
Interval Round Timer for Boxing, Circuit & HIIT
Interval Round Timer for Boxing, Circuit & HIIT
Interval Round Timer for Boxing, Circuit & HIIT
by Catrnja Dev
Free

Easily create custom interval workouts for various training types like boxing, circuit, and HIIT. This user-friendly app allows for quick setup and immediate workout tracking, simplifying your fitness routine.

Custom interval workout creationSupports boxing, circuit, and HIITEasy to use interface
💪 Health & Fitness
(4)
free with in-app purchases
14
Capillary Training
Capillary Training
Capillary Training
by Allogy Interactive
Free

This app empowers users to create, publish, and deliver effective training content using a mobile learning platform. It offers tools for content creation, analytics tracking, and course delivery, including certifications.

Create training contentPublish training contentDeliver training content
📚 Education
(1)
free
15
A. O. Smith Academy
A. O. Smith Academy
A. O. Smith Academy
by EPK Training Solutions Inc.
Free
📚 Education
(0)
16
G2 Training
G2 Training
G2 Training
by G2 Training LLC
Free

This app allows users to create accounts, schedule complimentary assessments, and purchase and book personal training sessions. Users can train in-studio or remotely, view promotions, and access studio location and social media links.

Account creationSchedule complimentary assessmentsPurchase personal training sessions
💪 Health & Fitness
(1)
free with in-app purchases
17
Dräger Gas Detection Training
Dräger Gas Detection Training
Dräger Gas Detection Training
by Draegerwerk AG & Co. KGaA
Free

This app simulates gas measuring devices for training purposes, allowing trainers to send gas values and alarms to student devices. It supports both single-device demo mode and multi-device trainer/trainee scenarios with customizable settings and alarms.

Simulates gas measuring devicesTrainer/trainee modesDemo mode for single device
📚 Education
(1)
free
18
WOD Deck of Cards
WOD Deck of Cards
WOD Deck of Cards
HIIT Timer for Cross Training
Free

This app helps CrossFit athletes and coaches create and track custom workouts. It allows for flexible session planning, detailed performance reporting, and sharing progress with a community. Enjoy offline access and background mode for uninterrupted training.

Custom WOD creationDetailed performance statsWorkout sharing
💪 Health & Fitness
(53)
free with in-app purchases
19
Rocket: Endurance Training App
Rocket: Endurance Training App
Rocket: Endurance Training App
For Triathlon, Running & HYROX
Free
💪 Health & Fitness
(0)
20
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

FAQ about O2 Circuit Training

Are there free o2 circuit training apps for iPhone?
Yes — 20 of the top o2 circuit training apps we rank are free to download, including O2 CIRCUIT TRAINING and Circuit Training Timer Lite.
O2 CIRCUIT TRAINING has no ads and has no in-app purchases, according to its App Store listing as of August 2026.
We track 247+ o2 circuit training apps on the iOS App Store as of August 2026, ranked by rating, recency, and analysis of real user reviews.