# Fuzzy Yellow Balls vs USTA Flex

The clearest difference is in-app purchases: USTA Flex at none against Fuzzy Yellow Balls's 8. USTA Flex also leads on review sentiment (41% vs 31%) and iOS requirement (13.0 vs 15.1). On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. Fuzzy Yellow Balls sells 8 in-app purchases, starting at $9.99 per month. USTA Flex asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.7 for Fuzzy Yellow Balls against 4.8 for USTA Flex. Both are backed by a comparable volume of ratings — 422 and 747 respectively. Written reviews are what separate them: 31% of Fuzzy Yellow Balls's written reviews are positive against 41% of USTA Flex's.

Both ship on a similar rhythm, roughly fortnightly. Both last shipped on October 21, 2026.

## The numbers

| Metric | Fuzzy Yellow Balls | USTA Flex |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (422 ratings)](https://appshunter.io/ios/app/fuzzy-yellow-balls/id1549661256/reviews) | **[4.8 (747 ratings)](https://appshunter.io/ios/app/usta-flex/id6446393326/reviews)** |
| Number of ratings | 422 | **747** |
| Positive reviews | 31.3% of reviews | **40.7% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | Fortnightly |
| Monetization | Free with in-app purchases | **Free** |
| Size | 41 MB | 133 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Fuzzy Yellow Balls, LLC](https://appshunter.io/developer/1549661258) | [USTA](https://appshunter.io/developer/327455872) |

## What reviewers say

### Fuzzy Yellow Balls

[App page](https://appshunter.io/ios/app/fuzzy-yellow-balls/id1549661256)

Access a comprehensive library of tennis books and instructional programs directly on your mobile device. This app functions like a digital reader with integrated video playback for a complete learning experience.

**Highlights:** Access tennis books and programs, Integrated video player, Mobile library access, Digital learning platform

**Features:** Vision Pro support

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FYB Monthly | $9.99 | per month |
| FYB Monthly | $9.99 | per month |
| FYB Yearly | $99.99 | per year |
| FYB Yearly | $99.99 | per year |
| FYB Yearly | $99.99 | per year |
| FYB Yearly 2023 | $149.99 | per year |
| FYB Yearly 2023 | $199.99 | per year |
| Lifetime Access | $499.99 | one-time |

**What reviewers like**

- 👍 Intuitive layout and easy navigation
- 👍 Good information and valuable content
- 👍 Informative content on specific techniques
- 👍 Great value strategy and technical advice
- 👍 App appears to have full range of offerings

**What reviewers complain about**

- 💸 Expensive courses
- 👎 Annoying presenter/host (Will)
- 👎 Mansplainy and awkward host
- 👎 Videos glitch and not auto-play
- 👎 App would not load/access material

**Reported bugs**

- App would not load for days
- Videos glitch when turning phone
- Videos not auto-play
- Consistently freezes videos
- Delay in videos

**Requested features**

- Add auto-play feature for lessons
- Improve video player functionality
- Provide more detailed 'why' behind rule differences
- Better application of % differences for junior/amateur players
- More fundamentals vs. % comparisons


### USTA Flex

[App page](https://appshunter.io/ios/app/usta-flex/id6446393326)

Find and play competitive tennis matches at your level on courts near you. Arrange games flexibly around your schedule and meet new players. Track your progress and improve your game with level-based singles or doubles matches.

**Highlights:** Find level-based tennis matches, Flexible scheduling with in-app chat, Singles and doubles competition, Track match history and progress, Utilizes ITF World Tennis Number for matchmaking, Organize and enter leagues

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

**In-app purchases:** none

**What reviewers like**

- 👍 User-friendly interface
- 👍 Easy to coordinate matches
- 👍 Easy score entry
- 👍 Excellent customer service
- 👍 Flexible scheduling

**What reviewers complain about**

- 👎 Not user-friendly
- 👎 App works inconsistently
- 👎 Constant notifications
- 👎 Cannot toggle to see schedule
- 👎 Score manipulation possible

**Reported bugs**

- App works when it wants
- Constant notifications with no messages
- Cannot toggle back to see schedule
- WTN score not figured out
- Unable to login

**Requested features**

- Link match times to calendars
- Calendar in the app
- Display all scheduled matches
- Input availability directly
- Google SSO integration


## Frequently asked questions

### Is Fuzzy Yellow Balls free?

Fuzzy Yellow Balls is free to download, with in-app purchases available.

### Is USTA Flex free?

USTA Flex is free to download, with no in-app purchases.

### Which has better reviews, Fuzzy Yellow Balls or USTA Flex?

USTA Flex is rated higher. Fuzzy Yellow Balls averages 4.7 out of 5 from 422 ratings, while USTA Flex averages 4.8 from 747 ratings.

### Do Fuzzy Yellow Balls or USTA Flex have ads?

Neither Fuzzy Yellow Balls nor USTA Flex shows ads.

### Which is updated more often, Fuzzy Yellow Balls or USTA Flex?

Fuzzy Yellow Balls ships an update fortnightly, and USTA Flex fortnightly. Most recently, Fuzzy Yellow Balls was updated on October 21, 2026 and USTA Flex on October 21, 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.*