USTA Flex vs TENNIIX
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
USTA Flex
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.
- 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
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With USTA Flex, you can play tennis at your level on a court near you, whenever it suits you. Get on the court and enjoy friendly, competitive singles or doubles matches. Whatever your level – beginner or advanced – you will play exciting matches, meet new people and improve your game. Flex leagues are taking place all across the US and all year round for adults over the age of 18. Leagues take place in a round-robin or ladder 2.0 format, and a season generally runs for 8 to 12 weeks. You can arrange matches whenever you want – so it’s ideal if you’re looking to compete around your busy lifestyle. Why you should join More tennis: Play 5-7 level-based matches while making new tennis friends Ultimate flexibility: With our in-app chat, scheduling matches around your life has never been easier. Play when you want, where you want Track your progress: Every match is an opportunity to improve your game and improve your WTN rating Features of the USTA Flex app - Find all you need in one place – entering leagues, setting up matches, inputting scores and match history - In-app chat – easily schedule matches with your opponents with individual and group chats - More to come: Set up your own flex leagues and join local events and communities to get the most out of your tennis Not sure of your level of play? No problem – we’ll find the right group for you using your ITF World Tennis Number, so you play opponents at the right level for you. What’s the ITF World Tennis Number? The ITF World Tennis Number is a rating system for all tennis players across the world. It makes it easier for everyone who plays tennis in US to organize and play against opponents of a similar standard. • A worldwide rating system that ranges from 40 (beginner players) to 1 (pro players). • Has separate ratings for Singles and Doubles players • Uses a sophisticated algorithm to calculate your rating and updates it every time you compete • Counts sets and matches played, which means the more you compete, the more accurate your WTN will be Game on! Download the USTA Flex App today and enter a world where more tennis matches are just a tap away. Join our community of passionate players and discover the joy of playing tennis on your terms. Let’s make every match count with USTA Flex!
TENNIIX
Control your tennis ball machine wirelessly to customize serve speed, spin, and landing points. Analyze training data to improve your game. Perfect for solo practice and match preparation.
- Wireless ball machine control
- Adjust serve speed and spin
- Customize landing points
- Create custom training programs
- Real-time data tracking
- Analyze training effectiveness
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The ultimate smart control center for tennis enthusiasts! Remotely control your ball machine wirelessly via the mobile app. Easily adjust serve speed, spin type (topspin, backspin, flat), and precise landing points to create customized training programs. The app provides real-time data tracking to help you analyze training effectiveness, efficiently improving forehand and backhand consistency and match play skills. Whether practicing solo or with multiple balls, it's all just a tap away. Simple connection, intuitive operation. Download now and embark on your professional-grade smart tennis training journey! Translated with DeepL.com (free version)
Screenshots
Verdict
The clearest difference is rating: USTA Flex at 4.8 against TENNIIX's 2.8. USTA Flex also leads on ratings volume (779 vs 49) and iOS requirement (13.0 vs 15.0). On price, review sentiment, update cadence and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
USTA Flex holds the better App Store score, 4.8 against 2.8. That said, the two scores are not equally well evidenced: USTA Flex has 779 ratings behind it against 49, so its average is the more settled of the two. Written reviews complicate that: 39% of USTA Flex's written reviews are positive against 41% of TENNIIX's, so the app with the better star average is not the one people write more warmly about.
Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on November 7, 2026 and November 8, 2026 respectively.
| Parameter | USTA Flex | TENNIIX |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (779 ratings) — better | 2.8 (49 ratings) |
| Positive reviews | 39.3% of reviews | 41.4% of reviews — better |
| Number of ratings | 779 — better | 49 |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 133 MB | 77 MB |
| Age rating | 4+ | 9+ |
| Developer | USTA | Shenzhen Enhanced Power Technology Co., Ltd. |
Customer experience
USTA Flex
TENNIIX
Bugs and requests
USTA Flex
Reported bugs
11 issues- App works when it wants
- Constant notifications with no messages
- Cannot toggle back to see schedule
- WTN score not figured out
- Unable to login
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- Cannot sign in with Google SSO
- Cannot post score
- Error: could not load data from server
- Scores could not be inputted
- Bad at positioning and assignments for ladder matches
- Trouble to login
Requested features
6 requests- Link match times to calendars
- Calendar in the app
- Display all scheduled matches
- Input availability directly
- Google SSO integration
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- Match score editing controls
TENNIIX
Not enough reviews yet to summarise bugs or requests.
In-app purchases
USTA Flex
No in-app purchases
TENNIIX
No in-app purchases









