Comparison

V.O2 vs RunKASI

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

Head to head
About

V.O2

This app provides adaptive training plans and personalized coaching for runners of all levels. It assesses your fitness, offers custom paces, and syncs with popular devices. Train intelligently to achieve measurable improvements and become your best runner.

Highlights
  • Adaptive training plans
  • VDOT fitness assessment
  • Personalized training paces
  • Sync with Apple Health, Coros, Garmin, Strava
  • Real-time guidance on Apple Watch, Coros, Garmin
  • Training adaptation based on improvement
  • Coach communication and training adjustments
Features
Read full description

Coaching app for athletes looking to take their running to the next level. How it works Athletes: Get an invite from a coach or choose one coaching option. • Adaptive Trainer (14-Day Free Trial) • Goal Race Plan • Match with a Private Coach Coaches: Start your 30-day free trial and learn how to manage your athletes at https://vdoto2.com/vdotcoach Popular Features • Assess your current running fitness (VDOT) • Built-in personalized training paces • Sync training calendar with GPS data from Apple Health, Coros, Garmin or Strava • Sync workouts/pace targets to Apple Watch, Coros or Garmin for real-time guidance • Adapt your training based on your improvement • Work with your coach, communicate and adjust training Truly Personalized Unlike most running apps, VDOT knows you. It understands the type of runner you are, what you're training for, and how to maximize your efforts. It also gives you more control over your training, leveraging your feedback to deliver real-time data which fine tunes your training and leads to continuous progression. With fully automated, truly personalized and highly-adaptive training, VDOT helps you achieve measurable improvement — all in an effort to make you the best runner you can be. Intelligent Training With a focus on training over tracking and coaching over running, VDOT offers access to the highest quality, Olympic-style training for runners of all levels-right from any mobile device. Designed to help runners train correctly and more intelligently, VDOT elicits maximum benefit while reducing the required effort. These high-quality workouts promote healthy, responsible, and beneficial sessions while simultaneously preventing overtraining. Olympic Pedigree V.O2 was built from the foundation of a scientifically-validated training methodology. Based on former Olympian, author, and legendary running coach Jack Daniels’ exercise science principles, the methodology not only benefits runners of all ages and abilities when it comes to improving their running fitness but it also serves as the best measure of running economy across a variety of runners and events, making it an ideal way to compare performances. High-school, college, Olympic and non-elite runners have all trained, ran, and succeeded with the VDOT methodology. -”Dr. Jack Daniels has had a bigger influence on training-for-running than anyone. He might be considered the Albert Einstein of the sport." - Runner’s World Magazine

About

RunKASI

Receive real-time audio coaching during your runs, with personalized feedback based on your biometric data. Connect with remote human coaches who can monitor your progress and provide guidance from anywhere.

Highlights
  • Real-time audio coaching
  • Biometric data interpretation
  • Remote human coaching
  • Extensive workout menu
  • Apple Watch integration
  • Bluetooth earphone support
Features
Read full description

KASI provides real-time audio coaching through your phone and Apple watch. Choose your workout from KASI's large Workout Menu. Using specific workout biometrics and Bluetooth earphones, the audio coach reads and interprets your biometric data and coaches you in your ear during your workouts. KASI also revolutionizes remote human coaching. Your workout data are transmitted to your remote coach, anywhere in the world, and displayed on his or her computer screen or smartphone dashboard, enabling your human coach to observe your workouts from a remote location and coach you in real time, even without being in person. Download to start your two-week free trial. After two weeks, choose from 6-month or 12-month paid subscriptions. Privacy Policy: https://www.runkasi.com/privacy-policy Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula

Screenshots

V.O24 screens
RunKASI4 screens

Verdict

The call

V.O2 and RunKASI both sit at 4.9 stars, but that hides the real split: 100% of RunKASI's written reviews are positive against 71% of V.O2's. V.O2's advantage is update cadence (weekly vs every 5 weeks) and ratings volume (6.3K vs 7). On price, rating, ads and in-app purchases 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. V.O2 sells 16 in-app purchases, starting at $12.99 per month and RunKASI sells 2 in-app purchases, starting at $59.99 per 6 months. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.9 for V.O2 against 5.0 for RunKASI. That said, the two scores are not equally well evidenced: V.O2 has 6.3K ratings behind it against 7, so its average is the more settled of the two. Written reviews are what separate them: 71% of V.O2's written reviews are positive against 100% of RunKASI's.

UpkeepUpdate frequency

V.O2 ships an update weekly, RunKASI every 5 weeks. The most recent releases landed on October 29, 2026 and October 21, 2026 respectively.

Scorecard3 real differences · 7 level
V.O2 versus RunKASI: the parameters behind the verdict, then further details
ParameterV.O2RunKASI
PriceFreeFree
Rating4.9 (6.3K ratings)5.0 (7 ratings) — better
Positive reviews71.0% of reviews100.0% of reviews — better
Number of ratings6.3K — better7
Update frequencyWeekly — betterEvery 5 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPadiPhone, Apple Watch
Requires iOS16.6 — better17.0
Further details — not scored
Size142 MB27 MB
Age rating4+4+
DeveloperThe Run SMART Project, LLCKASI, LLC

Customer experience

V.O2

All ratings6,278 ratings
Positive97.6%
Neutral0.9%
Negative1.4%
Written reviews176 reviews
Positive71.0%
Neutral8.0%
Negative21.0%

RunKASI

All ratings6 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews7 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

V.O2

Reported bugs

4 issues
  • Apple Watch app issues and lack of functionality
  • Problems with syncing Garmin runs to the correct workouts
  • Inconsistent elevation and GPS data
  • Bugs and crashes when using the app

Requested features

6 requests
  • Ability to duplicate and edit workouts
  • Improved Apple Watch and Health app integration
  • More advanced adaptive training and automation
  • Expanded cross-training and workout modalities
  • Better user interface and workflow for coaches
Show 1 more
  • Keyword-based search for notes and workouts

RunKASI

Not enough reviews yet to summarise bugs or requests.

In-app purchases

16 purchases

V.O2

Subscriptions2
  • Adaptive Training Subscription14 Days trial2 variants$12.991 Month
  • Adaptive Training - Annual14 Days trial$99.991 Year
One-time14
  • Base/Fitness - 8 weeks$44.99
  • Half Marathon - 12 weeks$54.99
  • 10 Km - 12 weeks$54.99
Show 11 more
  • 5 Km - 12 weeks$54.99
  • 1500m - 12 weeks$54.99
  • 3 Km - 12 weeks$54.99
  • Marathon - 15 weeks$69.99
  • Half Marathon - 15 weeks$69.99
  • Marathon - 18 weeks$79.99
  • Half Marathon - 18 weeks$79.99
  • Jack's Elite Marathon - 18wks$79.99
  • Jack's First Marathon - 18wks$79.99
  • Jack's Boston Marathon - 18wks$94.99
  • Marathon - 24 weeks$99.99
2 purchases

RunKASI

Subscriptions2
  • Runner Semi Annual Plan$59.996 Months
  • Runner Annual Plan$83.901 Year

Questions

Is V.O2 free?
V.O2 is free to download, with in-app purchases available.
Is RunKASI free?
RunKASI is free to download, with in-app purchases available.
Which has better reviews, V.O2 or RunKASI?
RunKASI is rated higher. V.O2 averages 4.9 out of 5 from 6.3K ratings, while RunKASI averages 5.0 from 7 ratings.
Do V.O2 or RunKASI have ads?
Neither V.O2 nor RunKASI shows ads.
Which is updated more often, V.O2 or RunKASI?
V.O2 ships an update weekly, and RunKASI every 5 weeks. Most recently, V.O2 was updated on October 29, 2026 and RunKASI on October 21, 2026.

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