# IntervalCoach vs Strength IO

The clearest difference is rating: Strength IO at 5.0 against IntervalCoach's 4.8. IntervalCoach's advantage is ratings volume (11 vs 1) and update cadence (every 3 days vs every 6 days). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. IntervalCoach sells 4 in-app purchases, starting at $2.99 per month and Strength IO sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

Strength IO holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: IntervalCoach has 11 ratings behind it against 1, so its average is the more settled of the two.

IntervalCoach ships an update every 3 days, Strength IO every 6 days. The most recent releases landed on October 12, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | IntervalCoach | Strength IO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (11 ratings)](https://appshunter.io/ios/app/intervalcoach-ai-training/id6760976369/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/strength-io-workout-tracker/id6776702706/reviews)** |
| Number of ratings | **11** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 6 days |
| Monetization | Freemium | Freemium |
| Size | 29 MB | 27 MB |
| Requires iOS | **17.0** | 26.4 |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Martijn Russchen](https://appshunter.io/developer/1887107462) | [Crimson IO LLC](https://appshunter.io/developer/1864406504) |

## What reviewers say

### IntervalCoach

[App page](https://appshunter.io/ios/app/intervalcoach-ai-training/id6760976369)

This AI training coach adapts daily workouts for cyclists, runners, and triathletes based on recovery signals like HRV and sleep. It offers personalized training plans, readiness scoring, and multi-sport support.

**Highlights:** Daily adapting workouts based on recovery, Readiness scoring (HRV, sleep, load), Five periodization models, Multi-sport support (cycling, running, swimming, strength), Conversational AI coach (Coach+), Goal event countdown and progress projection

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $2.99 | per month |
| Max Monthly | $6.99 | per month |
| Pro Yearly | $24.99 | per year |
| Max Yearly | $69.99 | per year |


### Strength IO

[App page](https://appshunter.io/ios/app/strength-io-workout-tracker/id6776702706)

This app intelligently adapts your strength training sessions based on your daily recovery signals and logged activities from other apps. It analyzes multiple health metrics to determine optimal workout intensity, preventing overtraining and maximizing gains. Track your progress with detailed athlete profiles and personalized insights.

**Highlights:** Adaptive training based on per-muscle recovery, Integrates with Apple Health for activity logging, Readiness score from seven health signals, Training load analysis (7-day vs. 28-day), Smart weekly volume tracking, Comprehensive athlete profile with strength and cardio scores, Private by default, on-device coaching

**Features:** Family Sharing, Apple Watch app

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Strength IO Pro | $9.99 | per month |
| Strength IO Pro | $59.99 | per year |


## Frequently asked questions

### Is IntervalCoach free?

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

### Is Strength IO free?

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

### Which has better reviews, IntervalCoach or Strength IO?

Strength IO is rated higher. IntervalCoach averages 4.8 out of 5 from 11 ratings, while Strength IO averages 5.0 from 1 ratings.

### Do IntervalCoach or Strength IO have ads?

Neither IntervalCoach nor Strength IO shows ads.

### Which is updated more often, IntervalCoach or Strength IO?

IntervalCoach ships an update every 3 days, and Strength IO every 6 days. Most recently, IntervalCoach was updated on October 12, 2026 and Strength IO on October 10, 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.*