ServeOn vs StringSense
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ServeOn
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ServeOn is the smartwatch & smartphone app to raise your tennis game to the next level! Train with your Apple Watch and analyse your game with our two modes: Serve Training: Our innovative technology analyses each of your serves and gives you personalised feedback and optimised statistics. We analyse, for example: - the acceleration/speed - the rotation of your racket - the timing and height of the ball toss - the similarity of your movement to the optimal movement Game mode (coming soon): Run ServeOn on your Apple Watch during training or a match and analyse your statistics in real time while you're still playing! Find out how often you play - forehand/ backhand/ volleys - Top Spin/ Slice - Longline/ Cross and much more! Use ServeOn and improve your game with or without a coach! Use the ServeOn app for your iPhone during or after a training session and analyse your swings even more! Phone app features: - Innovative reproduction of your serve movement in 3-dimensional space - Statistical values of your serve compared to your average strokes - Diagrams of your serve and swing behaviour (coming soon) ServeOn can now be used free by anyone. Das Projekt ServeOn wird im Rahmen des EXIST-Programms durch das Bundesministerium für Wirtschaft und Energie und den Europäischen Sozialfonds gefördert. In Zusammenarbeit mit der LMU München. Privacy Policy: https://www.serve-on.de/datenschutz Impressum: https://www.serve-on.de/impressum
StringSense
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Dead strings cost you power, spin, and control — but most players have no idea when it's time to restring. StringSense tells you exactly when your strings are due, so you always play with confidence. What Makes StringSense Different Unlike simple timers or tone-based tools, StringSense uses a science-informed string health model. It factors in your string type, playing time, court surface, temperature, intensity, player level, and your racquet's specs to calculate a real-time health score for every racquet you own. True Hybrid Support Play with a hybrid setup? StringSense tracks your mains and crosses string types separately. The algorithm calculates wear based on the actual materials — so a poly/gut hybrid gets a different health score than a poly/multi hybrid. No more averaged guesswork. Your Racquet Counts String pattern and head size change how fast your strings wear. A dense 18×20 on a small head spares them (up to 15% more string life); an open 16×19 on a big head punishes them (up to 13% less). Log string pattern, head size, and weight per racquet, all optional — or pick your model from the built-in catalog (Babolat, Wilson, Head, Yonex, and more) and the specs fill in automatically. How It Works 1. Add your racquet and log your string job with string type and tension. 2. Record your play sessions — duration, surface, intensity, and conditions. 3. Watch your string health score update automatically after every session. 4. Get a clear signal when it's time for fresh strings. Smart Check After each session, StringSense asks how your strings felt: crisp, normal, or mushy. Over time it learns the health level at which your strings feel dead to YOU and tunes your restring recommendation to match — the more you check in, the sharper it gets. Reminders You don't have to keep checking. StringSense tells you when your strings reach your personal restring threshold — the one it learned from your Smart Checks. One wear reminder per stringing, scheduled for the morning and never at night — your device decides the exact moment. Free, switched on once after your first string job, and off again in the Workshop whenever you like. Until you've logged sessions it stays quiet — with no play time there is nothing to estimate. Rating & favorites How did the last stringing play? StringSense asks once when it comes off the racquet after you've logged sessions on it: stars, five traits, a private note. Setups you want again become favorites — on your next string job, strings, types, gauges and tensions are pre-filled. Knowledge Base & Glossary Five string type guides explain character and warning signs. Plus a glossary from string pattern to settling — free, right in the Workshop. Your Dashboard at a Glance See all your racquets in one place with live health indicators. Track your total play hours, average string health, and tension history with detailed graphs. Swipe through your racquets, tap for details, and stay on top of your equipment. Works Offline No Wi-Fi at the club? No problem. StringSense stores everything locally and syncs automatically when you're back online. Your data is always available, on or off the court. StringSense Pro The free version gives you core string tracking for one racquet — no time limit. When you're ready for more: • Unlimited racquets • Detailed tension graphs • Data export (CSV & JSON) • Time reminder after 3, 6, 9 or 12 months, with a head start • Per-racquet reminder control • Support ongoing development Privacy First Your data belongs to you. StringSense shows no ads and never sells your data — your racquet and session data is stored securely in your personal account and never shared. Whether you're a club player who strings every few months, a tournament competitor who restrings weekly, or a weekend warrior who just wants to know when it's time — StringSense keeps your equipment in peak condition. Download StringSense and never play on dead strings again.
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Verdict
The clearest difference is in-app purchases: ServeOn at none against StringSense's 2. ServeOn also leads on update cadence (every 4 days vs every 3 weeks). On price, ads, device support and iOS requirement 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. StringSense sells 2 in-app purchases, starting at $0.99 per month. ServeOn asks for nothing beyond the download.
ServeOn ships an update every 4 days, StringSense every 3 weeks. The most recent releases landed on October 25, 2026 and October 31, 2026 respectively.
| Parameter | ServeOn | StringSense |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 days — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, Apple Watch | iPhone, iPad |
| Requires iOS | 16.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 70 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | JULIAN ALEXANDER BRUSTLE | Stefan Große |
In-app purchases
ServeOn
No in-app purchases
StringSense
- StringSense Pro Monthly1 Month trial$0.991 Month
- StringSense Pro Yearly1 Month trial$9.991 Year









