USTA Flex vs TossBuddy
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!
TossBuddy
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You do not have a swing problem. You have a toss problem. After thousands of lessons, one question came up more than any other: how do I hit a kick serve? Players thought they needed a new swing, more power, more flexibility. Almost nobody realised the obstacle was the toss, and that they had no real idea where “behind your head” actually is. TossBuddy puts a coach’s eye on every toss you make. HOW IT WORKS Mount your phone on a tripod or on your ball cart, line up on the baseline where the app shows you, and serve as you normally would. Your iPhone camera watches the ball leave your hand and measures where it goes, in real time, frame by frame. Perfect, left, right or too low. You know before the ball comes down. Instant feedback right when you serve, not in a video you watch tonight. Kick Serve and First Serve each have their own target, because they are not the same toss. SEE YOUR PATTERN, NOT ONE TOSS One good toss is luck. Forty is a serve. Toss Radar draws a whole session on a single map, measured from your head at release: where you let go of the ball, where it peaked, and where you made contact. Each circle shows how far that point typically sits from its own average. Tighter is more repeatable. Switch between Path, Apex, Release and Contact to find which part of the toss is drifting, and watch the circles shrink as it stops. LOG WHERE THE SERVE LANDED, FROM YOUR WRIST If you have an Apple Watch, you never walk back to the phone. When TossBuddy sees you strike a serve, your watch taps you. Turn the crown to pick the side, tap where the serve landed, and serve again. It takes about a second. Your Serve Hotzone then shows every serve you have logged, so you can see whether the toss you are proud of is actually sending the ball where you want it. The watch is optional. Everything else works without one. YOUR PRACTICE, KEPT Goals, streaks and daily missions, so there is a reason to come back tomorrow. Session history, so this week can be compared to last. Leaderboards if you want them, friends if you want them, neither if you do not. Record a session when you want to see it for yourself. TOSSBUDDY PRO Zone analysis on your Serve Hotzone, twice the practice balls before you run dry, and every toss you have ever made. Monthly or yearly, or a single Lifetime payment that never renews. Yearly works out to less than half a one-hour lesson. PRIVACY, PLAINLY Your practice videos never leave your device. There is no upload path in the app at all and no server that could receive one. Every frame is analysed on your iPhone, using Apple's own on-device vision frameworks. You can delete your account, and everything in it, from inside the app. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://rtptennis.com/pages/tossbuddy-privacy-policy
Screenshots
Verdict
The clearest difference is update cadence: TossBuddy at daily against USTA Flex's every 3 weeks. USTA Flex's advantage is iOS requirement (13.0 vs 26.0). On price, ads, in-app purchases and device support 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 ships an update every 3 weeks, TossBuddy daily. The most recent releases landed on November 2, 2026 and October 25, 2026 respectively.
| Parameter | USTA Flex | TossBuddy |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (772 ratings) — better | — |
| Positive reviews | 39.3% of reviews | — |
| Number of ratings | 772 — better | — |
| Update frequency | Every 3 weeks | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Requires iOS | 13.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 133 MB | 45 MB |
| Age rating | 4+ | 4+ |
| Developer | USTA | Sky Kim |
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
TossBuddy
Not enough reviews yet to summarise bugs or requests.
In-app purchases
USTA Flex
No in-app purchases
TossBuddy
No in-app purchases









