# kaizen | Adaptive Run Training vs Subintervals

The clearest difference is review sentiment: Subintervals at 100% against kaizen | Adaptive Run Training's 58%. Subintervals also leads on monetization model (free with in-app purchases vs subscription) and rating (5.0 vs 4.8). kaizen | Adaptive Run Training's advantage is ratings volume (28 vs 2). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. kaizen | Adaptive Run Training sells 15 in-app purchases, starting at $12.99 per month and Subintervals sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Subintervals holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: kaizen | Adaptive Run Training has 28 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 58% of kaizen | Adaptive Run Training's written reviews are positive against 100% of Subintervals's.

kaizen | Adaptive Run Training ships an update every 10 days, Subintervals weekly. The most recent releases landed on October 14, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | kaizen | Adaptive Run Training | Subintervals |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (28 ratings)](https://appshunter.io/ios/app/kaizen-adaptive-run-training/id1638679224/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/subintervals/id6479748688/reviews)** |
| Number of ratings | **28** | 2 |
| Positive reviews | 58.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 10 days | **Weekly** |
| Monetization | Subscription | **Free with in-app purchases** |
| Size | 81 MB | 95 MB |
| Requires iOS | 16.4 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Run Kaizen LTD](https://appshunter.io/developer/1638679226) | [Inaki Arroyo Nebreda](https://appshunter.io/developer/1736987639) |

## What reviewers say

### kaizen | Adaptive Run Training

[App page](https://appshunter.io/ios/app/kaizen-adaptive-run-training/id1638679224)

This app uses your running history to calculate your current fitness and set dynamic weekly distance targets. It offers personalized training guidance to help you achieve your running goals, whether for a specific race or general improvement. The app provides race predictions and flexible training plans that adapt to your schedule.

**Highlights:** Data-driven training partner, Dynamic weekly distance targets, Personalized fitness calculations, Race predictions for various distances, Flexible training plans, Build consistency and improve fitness

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (15)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Subscription | $12.99 | per month |
| Subscription | $12.99 | per month |
| Monthly Subscription | $14.99 | per month |
| Monthly Subscription | $14.99 | per month |
| Subscription | $14.99 | per month |
| Subscription | $19.99 | per 3 months |
| Subscription | $24.99 | per 3 months |
| Quarterly Subscription | $34.99 | per 3 months |
| Quarterly Subscription | $34.99 | per 3 months |
| Subscription | $49.99 | per year |
| Subscription | $69.99 | per year |
| Annual Subscription | $89.99 | per year |
| Annual Subscription | $89.99 | per year |
| Subscription | $89.99 | per year |
| Subscription | $89.99 | per year |

**What reviewers like**

- ✨ Adaptive and flexible training
- 🎯 Accurate race predictions
- 📈 Helps with improvement and progress
- 💡 Simple and effective concept
- 🤝 Good customer support

**What reviewers complain about**

- 🐛 Very buggy and unstable
- 📉 Inaccurate predictions sometimes
- 🤔 Confusing to understand and use
- 💰 Expensive subscription fee
- ⏳ Lacks advanced features

**Reported bugs**

- Setup process crashes or loops
- App crashes frequently
- Mileage calculations are incorrect
- Planned mileage doesn't add up correctly
- App doesn't get past the first step

**Requested features**

- Allow editing of runs
- More personalization in training plans
- Ability to start the training week on different days
- Consider elevation in training calculations
- Add more workout suggestions and paces


### Subintervals

[App page](https://appshunter.io/ios/app/subintervals/id6479748688)

Visualize your training data with detailed displays and interactive graphs. Customize your analysis and sync seamlessly with intervals.icu for up-to-the-minute insights into activities, events, and performance metrics.

**Highlights:** Detailed activity and event visualization, Interactive performance graphs, Seamless intervals.icu sync, Customizable data analysis, Actionable training insights

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coffee | $3.99 | one-time |
| Lunch | $11.99 | one-time |
| Big Thanks | $17.99 | one-time |
| Sponsor | $44.99 | one-time |


## Frequently asked questions

### Is kaizen | Adaptive Run Training free?

kaizen | Adaptive Run Training is free to download, with in-app purchases available.

### Is Subintervals free?

Subintervals is free to download, with in-app purchases available.

### Which has better reviews, kaizen | Adaptive Run Training or Subintervals?

Subintervals is rated higher. kaizen | Adaptive Run Training averages 4.8 out of 5 from 28 ratings, while Subintervals averages 5.0 from 2 ratings.

### Do kaizen | Adaptive Run Training or Subintervals have ads?

Neither kaizen | Adaptive Run Training nor Subintervals shows ads.

### Which is updated more often, kaizen | Adaptive Run Training or Subintervals?

kaizen | Adaptive Run Training ships an update every 10 days, and Subintervals weekly. Most recently, kaizen | Adaptive Run Training was updated on October 14, 2026 and Subintervals on September 29, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*