# Restrr vs Castra App

The clearest difference is update cadence: Castra App at weekly against Restrr's every 3 months. Castra App also leads on iOS requirement (16.6 vs 18.5). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Restrr sells 3 in-app purchases, starting at $1.99 per month and Castra App sells 4 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Restrr ships an update every 3 months, Castra App weekly. The most recent releases landed on September 24, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Restrr | Castra App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/restrr-gym-rest-timer/id6478751420/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 19 MB | 66 MB |
| Requires iOS | 18.5 | **16.6** |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Age rating | 4+ | 17+ |
| Developer | [Matija Gunther](https://appshunter.io/developer/1733805006) | [CASTRA APP OOD](https://appshunter.io/developer/1761241022) |

## What reviewers say

### Restrr

[App page](https://appshunter.io/ios/app/restrr-gym-rest-timer/id6478751420)

Optimize your strength training and HIIT workouts with a smart rest countdown and automatic set counter. Stay focused with customizable notifications and live activity integration. Train more efficiently and effectively.

**Highlights:** Smart rest countdown, Automatic set counter, Live Activities & Dynamic Island integration, Customizable notifications, Workout optimization

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $1.99 | per month |
| Annual | $8.99 | per year |
| Lifetime | $3.99 | one-time |


### Castra App

[App page](https://appshunter.io/ios/app/castra-app/id6612004431)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Athlete Subscription | $4.99 | per month |
| Coach Monthly Subscription | $29.99 | per month |
| Athlete Annual Subscription | $49.99 | per year |
| Coach Yearly Subscription | $269.99 | per year |


## Frequently asked questions

### Is Restrr free?

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

### Is Castra App free?

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

### Do Restrr or Castra App have ads?

Neither Restrr nor Castra App shows ads.

### Which is updated more often, Restrr or Castra App?

Restrr ships an update every 3 months, and Castra App weekly. Most recently, Restrr was updated on September 24, 2026 and Castra App on October 22, 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.*