# CTRL.Room SI vs Darwin

The clearest difference is in-app purchases: CTRL.Room SI at none against Darwin's 2. Darwin's advantage is update cadence (every 3 days vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Darwin sells 2 in-app purchases, starting at $9.99 per month. CTRL.Room SI asks for nothing beyond the download.

CTRL.Room SI ships an update every 3 months, Darwin every 3 days. The most recent releases landed on September 24, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | CTRL.Room SI | Darwin |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/darwin-adaptive-training/id6790443867/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 days** |
| Monetization | — | Freemium |
| Size | 121 MB | 55 MB |
| Requires iOS | 16.4 | 16.4 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Sutra Fitness, Inc.](https://appshunter.io/developer/914371834) | [Darwin Endurance LLC](https://appshunter.io/developer/6790443869) |

## What reviewers say

### CTRL.Room SI

[App page](https://appshunter.io/ios/app/ctrlroom-si/id6778946108)

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

**In-app purchases:** none


### Darwin

[App page](https://appshunter.io/ios/app/darwin-adaptive-training/id6790443867)

This app creates personalized weekly training plans for endurance athletes, adapting to your actual performance, sleep, and well-being. It rebuilds your schedule each week, offering clear explanations for adjustments and incorporating race-specific training and fueling targets.

**Highlights:** Weekly plan rebuilding, Adaptive volume and intensity, Race-specific session shaping, Carbohydrate fueling targets, Readiness tracking from health data, Plain-language explanations

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Darwin | $9.99 | per month |
| Darwin | $79.99 | per year |


## Frequently asked questions

### Is CTRL.Room SI free?

CTRL.Room SI is free to download, with no in-app purchases.

### Is Darwin free?

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

### Do CTRL.Room SI or Darwin have ads?

Neither CTRL.Room SI nor Darwin shows ads.

### Which is updated more often, CTRL.Room SI or Darwin?

CTRL.Room SI ships an update every 3 months, and Darwin every 3 days. Most recently, CTRL.Room SI was updated on September 24, 2026 and Darwin on September 19, 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.*