V.O2 vs RunKASI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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
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.
- Real-time audio coaching
- Biometric data interpretation
- Remote human coaching
- Extensive workout menu
- Apple Watch integration
- Bluetooth earphone support
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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
Verdict
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
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.
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.
V.O2 ships an update weekly, RunKASI every 5 weeks. The most recent releases landed on October 29, 2026 and October 21, 2026 respectively.
| Parameter | V.O2 | RunKASI |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (6.3K ratings) | 5.0 (7 ratings) — better |
| Positive reviews | 71.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 6.3K — better | 7 |
| Update frequency | Weekly — better | Every 5 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Requires iOS | 16.6 — better | 17.0 |
| Further details — not scored | ||
| Size | 142 MB | 27 MB |
| Age rating | 4+ | 4+ |
| Developer | The Run SMART Project, LLC | KASI, LLC |
Customer experience
V.O2
RunKASI
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 moreShow fewer
- Keyword-based search for notes and workouts
RunKASI
Not enough reviews yet to summarise bugs or requests.
In-app purchases
V.O2
- Adaptive Training Subscription14 Days trial2 variants$12.991 Month
- Adaptive Training - Annual14 Days trial$99.991 Year
- Base/Fitness - 8 weeks$44.99
- Half Marathon - 12 weeks$54.99
- 10 Km - 12 weeks$54.99
Show 11 moreShow fewer
- 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
RunKASI
- Runner Semi Annual Plan$59.996 Months
- Runner Annual Plan$83.901 Year









