USTA Flex vs SwimGlass
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!
SwimGlass
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SwimGlass turns your Apple Health swim workouts into clear, useful training insight. Instead of digging through raw workout data, open SwimGlass to see what happened in your latest swim, how your pace is changing, and what your next session should focus on. Built for swimmers Track swim distance, duration, pace, calories, heart rate, stroke count, and pool context when Apple Health provides them Review your latest swim with active time, rest, pace curve, benchmark comparison, and a practical coach cue Compare recent training against previous weeks, months, and years See personal bests, streaks, training volume, pace trends, and consistency in one focused dashboard Use meters or yards, with pace shown per 100 m or per 100 yd Understand each workout SwimGlass gives every swim a detailed breakdown. Open a workout to inspect pace, heart rate, stroke rate, speed, cumulative distance, energy, stroke length, pace drift, and an estimated SWOLF view when the required data is available. For supported workouts, SwimGlass can also show: Active swimming vs rest Pace bands against your personal reference pace Stroke style distance breakdown First, middle, and final-third pacing Technique efficiency, including distance per stroke and strokes per 100 m Route maps for open-water swims with Health route data Turn stats into next steps The Insights tab highlights what changed, why it matters, and what to do next. SwimGlass looks at your recent pace, training load, benchmark pace, zone mix, technique signals, consistency, and data quality to create readable guidance instead of another wall of numbers. Home Screen widget Add the SwimGlass widget to keep your latest swim visible at a glance. Depending on widget size, it can show distance, pace, active time, rest, coach focus, reference pace, and a compact pace trend. Private by design SwimGlass reads swim workouts from Apple Health in read-only mode. It does not write workouts back to Apple Health. CSV exports are created locally and shared only when you choose to share them. If you swim with Apple Watch and want a cleaner way to understand your progress, SwimGlass gives your swim history the context it deserves.
Screenshots
Verdict
The clearest difference is price: USTA Flex at Free against SwimGlass's $1.99. USTA Flex also leads on update cadence (every 3 weeks vs every 6 weeks) and iOS requirement (13.0 vs 17.0). On 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
USTA Flex is free to download; SwimGlass costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
USTA Flex ships an update every 3 weeks, SwimGlass every 6 weeks. The most recent releases landed on October 25, 2026 and October 9, 2026 respectively.
| Parameter | USTA Flex | SwimGlass |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 4.8 (754 ratings) — better | — |
| Positive reviews | 39.3% of reviews | — |
| Number of ratings | 754 — better | — |
| Update frequency | Every 3 weeks — better | Every 6 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 133 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | USTA | Jan Zalsky |
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
SwimGlass
Not enough reviews yet to summarise bugs or requests.
In-app purchases
USTA Flex
No in-app purchases
SwimGlass
No in-app purchases
Questions
Is USTA Flex free?
Is SwimGlass free?
Do USTA Flex or SwimGlass have ads?
Which is updated more often, USTA Flex or SwimGlass?
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