# Under Armour vs KeyStacker

The clearest difference is in-app purchases: Under Armour at none against KeyStacker's 2. KeyStacker's advantage is update cadence (every 4 days vs fortnightly) and iOS requirement (16.4 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. KeyStacker sells 2 in-app purchases, starting at $2.99 per month. Under Armour asks for nothing beyond the download.

Under Armour ships an update fortnightly, KeyStacker every 4 days. The most recent releases landed on October 16, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Under Armour | KeyStacker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (77K ratings)](https://appshunter.io/ios/app/under-armour/id1092704571/reviews)** | — |
| Number of ratings | **77K** | — |
| Positive reviews | 82.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 132 MB | 52 MB |
| Requires iOS | 18.0 | **16.4** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Under Armour, Inc.](https://appshunter.io/developer/291890423) | [Didactic Initiatives LLC](https://appshunter.io/developer/1869697984) |

## What reviewers say

### Under Armour

[App page](https://appshunter.io/ios/app/under-armour/id1092704571)

Shop a wide range of athletic clothing, shoes, and gear designed for all fitness levels. Discover exclusive collections, receive personalized recommendations, and enjoy benefits like free shipping and rewards.

**Highlights:** Shop athletic clothing, shoes, and gear, Exclusive collections (Curry Brand, Project Rock), New drop alerts, Personalized product recommendations, Free shipping, returns, and exchanges, UA Rewards program with points and exclusive benefits, Streamlined checkout with multiple payment options

**Features:** Apple Wallet

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to navigate app
- 🚀 Smooth checkout process
- 💡 Ability to save items for later
- 👍 User-friendly interface
- 👍 Clean and intuitive design

**What reviewers complain about**

- 🐛 Inaccurate product availability
- 🐛 Inconsistent order fulfillment
- 🔍 Difficulty finding matching items
- 🐛 Unreliable customer service
- 🐛 Inability to edit orders

**Reported bugs**

- App crashing or freezing
- Incorrect product information or pricing
- Issues with login and account management
- Syncing problems between app and website

**Requested features**

- Ability to edit personal information within the app
- Option to track order status and history
- Improved product recommendations and outfit suggestions
- Better integration between app and website experience


### KeyStacker

[App page](https://appshunter.io/ios/app/keystacker-loyalty-wallet/id6777546206)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Key Stacker Pro (Monthly) | $2.99 | per month |
| Key Stacker Pro (Annual) | $24.99 | per year |


## Frequently asked questions

### Is Under Armour free?

Under Armour is free to download, with no in-app purchases.

### Is KeyStacker free?

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

### Do Under Armour or KeyStacker have ads?

Neither Under Armour nor KeyStacker shows ads.

### Which is updated more often, Under Armour or KeyStacker?

Under Armour ships an update fortnightly, and KeyStacker every 4 days. Most recently, Under Armour was updated on October 16, 2026 and KeyStacker on September 30, 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.*