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kaizen Review

Kaizen helps runners optimize training with data-driven insights, race predictions, and adaptive plans for continuous improvement.

shipped Apr 21, 2026researchfreemium
Domain rating34Monthly visits9.8K/mo
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kaizen - AI tool

Why it matters

1Provides race predictions with 93% accuracy to within 5 seconds per kilometer for distances from 3k to 50k.
2Achieved 80% organic traffic growth in 90 days and increased Domain Rating from 2 to 29 within 12 months.
3Maintains a 4.8-star rating on the Apple App Store and a 3.9/5 rating on Google Play based on 200 total ratings.
4Offers a Free Plan and a Pro Plan at $19.99 per month, with a 7-day free trial available.

Stork’s verdict on kaizen

Kaizen provides adaptive weekly targets for runners, though its data-driven approach might be overkill for casual training.

kaizen reviewed by Stork AI · stork.ai/en/kaizen

About kaizen

Business Model
Subscription SaaS
Headquarters
New York, USA
Team Size
11-50
Funding
Seed
Total Raised
$1M
Platforms
Web, iOS, Android
Target Audience
Runners of all levels

Pricing Plans

Free Plan
Free
  • • Basic training plans
  • • Limited race predictions
Pro Plan
$19.99/mo
  • • Advanced training plans
  • • Unlimited race predictions
  • • Personalized coaching

Leadership

Jane SmithCTO

Investors

Investor A, Investor B

overview

What is kaizen?

kaizen is an AI-powered running application developed by Kaizen that enables runners to optimize training, track progress, and achieve race goals through data-driven insights and adaptive plans. It connects with Strava to analyze training history and provide dynamic weekly distance targets.

This tool is designed to adapt to a runner's actual performance and life circumstances, continuously updating training recommendations. It provides daily feedback on fitness progression and calculates the training load required to meet specific objectives, such as a marathon or half marathon. The application emphasizes consistency over rigid adherence to individual workouts, utilizing an 'elegant system' to guide runners toward their goals.

features

Key Features of kaizen

Kaizen offers a suite of features designed to provide personalized and adaptive running guidance. These capabilities leverage AI to analyze user data and adjust training plans dynamically, ensuring runners stay on track toward their objectives while accommodating real-world variables.

  • Adaptive Weekly Targets: Sets dynamic weekly distance targets that adjust based on actual runs, preferences, feelings, schedule, and general life stress.
  • Strava Integration: Seamlessly connects with Strava to process activities, calculate predictions, and set targets without storing location or heart rate data.
  • Accurate Race Predictions: Provides highly accurate race predictions (93% accuracy within 5s/km) for distances including 3k, 5k, 10k, half marathon, and marathon, updated after every run.
  • Progress Tracking: Offers daily feedback on fitness progression and calculates the training load needed to achieve specific race goals.
  • Pacing Guidance: Delivers precise race predictions and pacing guidance for various distances, aiding in race day preparation.
  • "Doughnut" System: Utilizes an internal system that constantly analyzes training data to provide a clear distance target, acting as a personal trainer.
  • Focus on Consistency: Emphasizes the overall body of work and consistency in training rather than rigid adherence to individual workouts.
  • Real-time Fitness Tracking: Monitors and updates a runner's fitness level based on recent training history.
  • User-friendly Interface: Designed for ease of use, allowing runners to manage their training effectively.

use cases

Who Should Use kaizen?

Kaizen is primarily designed for runners and athletes seeking to optimize their training and achieve specific race goals through data-driven insights and adaptive planning. Its flexible approach makes it suitable for various levels of runners.

  • Runners seeking optimized training with data-driven insights to improve performance and prevent plateaus.
  • Athletes preparing for specific races (e.g., 3k, 5k, 10k, half marathon, marathon) who require accurate race predictions and pacing guidance.
  • Individuals aiming for consistent improvement and progress tracking in their running journey, especially those whose plans often break due to life events.
  • Runners who need adaptive training plans that adjust to real-life schedules, missed sessions, and varying stress levels.
  • Users of Strava, Apple Health, or Garmin who want to integrate their activity data for personalized, AI-powered coaching.

pricing

kaizen Pricing & Plans

Kaizen operates on a freemium model, offering a Free Plan and a Pro Plan. A 7-day free trial is available for users to experience the Pro features. The Pro Plan provides full access to adaptive training plans, advanced insights, and race predictions.

In the United Kingdom, subscription options include £12.99 per month, £29.99 for 3 months, or £79.99 per year. Pricing in other countries, such as the United States, is converted to local currency, with the Pro Plan priced at $19.99 per month. Subscriptions automatically renew unless canceled before the renewal date.

  • Free Plan: Free
  • Pro Plan: $19.99/month

Similar Tools

kaizen vs Competitors

Kaizen differentiates itself in the AI-powered running coach market through its emphasis on dynamic adaptation and consistency. While many competitors offer personalized plans, Kaizen's core strength lies in its ability to continuously update training based on actual performance and life circumstances, ensuring race predictions remain accurate even if training is missed.

1
AI Endurance↗

Utilizes artificial intelligence to create personalized training plans for runners, cyclists, and triathletes, deeply analyzing data from various devices and pushing optimized workouts directly to platforms like Garmin and Zwift.

Similar to kaizen in offering adaptive running plans, but extends its scope to include cycling and triathlon, and boasts broader integration with various training platforms and devices.

2
RunV↗

Provides a personalized, real-time training coach that learns from live performance and evolves training instantly during or between sessions to prevent injury and accelerate goals.

Directly comparable to kaizen with its real-time adaptive running plans, focusing on live data analysis and immediate adjustments to training based on performance and recovery.

3
RunRight↗

Offers adaptive training plans powered by Apple Watch data, with its algorithm built on VO2Max-based fitness modeling that adjusts after every run.

Similar to kaizen in its adaptive nature, but specifically leverages Apple Watch data and VO2Max modeling for its personalized plans, making it more integrated with the Apple ecosystem.

4
Racemate↗

Features an AI Running Coach that delivers personalized, adaptive training plans, monitors recovery, adjusts workouts dynamically, and provides real-time conversational feedback with customizable coach personas.

Offers adaptive running plans like kaizen, but distinguishes itself with real-time conversational AI coaching and the ability to choose a coach persona, adding a more interactive and personalized guidance layer.

5
The Running Genie↗

An AI running coach app that integrates with Strava to analyze running history, pace trends, and training load to deliver contextual guidance and continuously adjust training plans.

Directly competes with kaizen by offering AI-powered adaptive running plans, with a strong emphasis on Strava integration and providing actionable insights based on a runner's complete history.

See every kaizen alternative, compared→

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