# Loop Studios vs Stack

The clearest difference is in-app purchases: Loop Studios at none against Stack's 3. Stack's advantage is update cadence (every 6 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Stack sells 3 in-app purchases, starting at $3.99 per month. Loop Studios asks for nothing beyond the download.

Loop Studios ships an update every 3 weeks, Stack every 6 days. The most recent releases landed on October 9, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Loop Studios | Stack |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 6 days** |
| Size | 191 MB | 62 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Loop Pilates Limited](https://appshunter.io/developer/1880570484) | [Naveen Senapathi](https://appshunter.io/developer/1889130875) |

## What reviewers say

### Loop Studios

[App page](https://appshunter.io/ios/app/loop-studios/id6759768312)

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

**In-app purchases:** none


### Stack

[App page](https://appshunter.io/ios/app/stack-routine-tracker/id6761363465)

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stack Pro Monthly | $3.99 | per month |
| Stack Pro Annual | $39.99 | per year |
| Stack Pro Lifetime | $79.99 | one-time |


## Frequently asked questions

### Is Loop Studios free?

Loop Studios is free to download, with no in-app purchases.

### Is Stack free?

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

### Do Loop Studios or Stack have ads?

Neither Loop Studios nor Stack shows ads.

### Which is updated more often, Loop Studios or Stack?

Loop Studios ships an update every 3 weeks, and Stack every 6 days. Most recently, Loop Studios was updated on October 9, 2026 and Stack on September 27, 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.*