# String Tension AI — Measure Racquet Tension

> Racquet string tension measurement and tracking tool using iPhone microphone. (iPhone/iPad app by Trader Prosperity LLC.)

- Source: https://appshunter.io/ios/app/string-tension-ai/id6763697805 (this page in markdown: same URL + `.md`)
- Developer: [Trader Prosperity LLC](https://appshunter.io/developer/1895443729)
- Category: Sports, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 23 MB
- Languages: American English
- Released: 2026-05-03
- Data updated: 2026-08-25
- Monetization: freemium
- User reviews in markdown: https://appshunter.io/ios/app/string-tension-ai/id6763697805/reviews.md

## What is String Tension AI?

Know exactly when your strings need replacing — before you feel it on court.

String Tension AI turns your iPhone's microphone into a precision string tension meter. Tap your stringbed, and the app instantly analyzes the sound to calculate your current tension. Track how your strings lose tension over time and get personalized recommendations for your next restring.

HOW IT WORKS

1. Tap your racquet strings near the microphone
2. The app analyzes the sound and calculates tension
3. Track changes over time and know when to restring

No external devices needed — just your iPhone.

MEASURE WITH CONFIDENCE
• Real-time quality coaching guides you to better readings
• Calibrate with a known reference tension for maximum accuracy
• Quality scoring ensures reliable, consistent measurements

TRACK TENSION OVER TIME
• Visual tension decay charts show exactly how strings lose tension
• Smart restring recommendations based on your actual data
• Set personal tension targets with alerts when strings fall outside range
• Compare performance across different racquets side by side

PERSONALIZED RECOMMENDATIONS
• Tension Advisor suggests your optimal stringing tension
• "What If" scenarios for different conditions and playing styles
• String recommendations matched to your playstyle profile
• Hybrid string builder finds your perfect main/cross combination

YOUR COMPLETE STRING TOOLKIT
• Database of 200+ tennis strings with detailed characteristics
• Pro player string and racquet setups from the ATP, WTA, and Legends tours
• Cost tracking and annual budget management for restringing
• Restring history and analysis across all your racquets
• String wishlist to plan what to try next

PLAYING SESSION TRACKER
• Log playing time with intensity tracking
• Weekly streaks, goals, and 38 unlockable milestones
• See how playing volume affects your string tension

BUILT FOR SERIOUS PLAYERS
• Unlimited free measurements — no paywall on core features
• iCloud sync keeps your data across all your devices
• Export detailed PDF and CSV reports
• Send string job reports directly to your stringer

FREE VS PRO

Free: Unlimited measurements, 1 racquet, quality coaching, calibration, session tracking, goals, fun facts, pro player databases

PRO: Unlimited racquets, full analytics and decay charts, tension advisor, string recommendations, hybrid builder, cost analytics, detailed playing stats, milestones, iCloud sync, PDF/CSV export

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Download String Tension AI now and take control of your string tension today.

Terms of Use: https://stringtensionai.com/terms/
Privacy Policy: https://stringtensionai.com/privacy/

## Key features

- Measure string tension with iPhone microphone
- Track tension decay over time
- Personalized restring recommendations
- String database and player setups
- Playing session tracking
- Cost tracking for restringing

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Annual PRO | $29.99 | per year |
| Monthly PRO | $4.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Lifetime PRO | $69.99 | one-time |


## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/string-tension-ai/id6763697805/reviews.md

### 1/5 — Freezes

*2026-08-16*

Unfortunately, I never got to the point where I could test if this app can actually test my racket string bed tension. It requires you to set up the racket and string setup. It constantly froze. I finally gave up and deleted the app.

### 5/5 — Great for tracking string tension over time

*2026-05-15*

I’ve been using this for one month now and it's become part of my routine before matches. You just tap the strings and get a reading. What surprised me is how consistent the readings are when I tracked them over time. I like the chart readings and trends. I use Luxilon Alu Power and those strings lose tension fast, so being able to actually see the drop over a week or two is really useful for knowing when my strings are dead and impacting my game. After getting my racquet restrung I calibrated it in the app and the absolute tension numbers lined up pretty well too. There's also a section where you can see what strings and racquets the pros use which is fun to browse. Can't believe this is free honestly. Wish I found it earlier.

## Frequently asked questions about String Tension AI

### How does String Tension AI measure string tension?

String Tension AI uses your iPhone's microphone to analyze the sound produced when you tap your racquet strings. The app then processes this sound to calculate the current tension of your strings.

### What are the benefits of the Pro version of String Tension AI?

The Pro version unlocks advanced features like full analytics and decay charts, a tension advisor, string recommendations, hybrid string builder, cost analytics, detailed playing stats, milestones, iCloud sync, and PDF/CSV export.

### Can I use String Tension AI on multiple devices?

Yes, with the Pro version, iCloud sync is available, allowing you to keep your data across all your devices seamlessly.

### How often is String Tension AI updated?

The app was last updated on 2026-06-22, indicating regular updates to improve features and reliability. The latest version is 2.13.

### What is the age rating for String Tension AI?

String Tension AI has an age rating of 4+, making it suitable for a wide range of users.

### Does String Tension AI have ads?

No, String Tension AI does not contain advertisements. The app is ad-free.

### What kind of reports can I export from String Tension AI?

With the Pro version, you can export detailed PDF and CSV reports. You can also send string job reports directly to your stringer.

### How does String Tension AI compare to a physical string tension meter?

String Tension AI offers the convenience of using your iPhone's microphone, eliminating the need for external devices. It also provides advanced tracking, analysis, and personalized recommendations that physical meters may not offer.

## Version history (last 5 releases)

### 2.22 — 2026-08-22

String Tension AI 2.22 adds two major features to the iOS tennis racquet and string-tension tracking app: redesigned share cards and String Coach. String Coach is an on-device AI chat experience that answers questions about your racquet, strings, tension, playing history, restring timing, and costs using facts from your saved data. It requires iOS 26 or later, a supported locale, and an available Apple on-device language model; some questions require String Tension AI PRO.

The share-card redesign adds a feed-friendly portrait format, consistent personal artwork, clearer charts and status figures, and a new String Job Summary card for eligible retired setups. Version 2.22 also improves share-card accuracy, entitlement checks, accessibility, and layout reliability. String Coach keeps your questions, answers, and racquet data on device, does not log conversation text, and does not retain conversations after you close the Coach.

This update adds redesigned tennis share cards and String Coach, an on-device AI assistant grounded in your saved racquet and string data.

- Create refreshed visual cards in a new feed-friendly shape, with a consistent personal artwork style across your String Health, tension, milestone, streak, and cost highlights.
- Share a new String Job Summary card for retired setups, bringing their key playing, tension, and cost details together in one image when the relevant data is available.
- Ask the new String Coach about your racquet and strings. Its highlighted facts come directly from your data, while its on-device AI provides the supporting explanation.
- Enjoy clearer cards, more reliable sharing, and a milestone detail sheet that no longer crowds its badge under the navigation bar.

Plus, as always, performance improvements and bug fixes.

### 2.21 — 2026-08-15

Version 2.21 makes recommendations more personal by learning from the strings you have rated (PRO feature) and the trustworthy tension-retention history you have recorded. It also gives longer-term players a clearer view of how strings hold tension across multiple completed jobs, while making calendar, scrolling, action-menu, target-alert, and dashboard interactions more dependable (for ALL users).

Check out the new Session Calendar feature and log your sessions.

Plus, as always, performance improvements and bug fixes.

### 2.20 — 2026-08-10

Version 2.20 gives your playing history a clearer home with a month-at-a-glance calendar, makes string and restring workflows faster, and adds a convenient way to set a tension target after a measurement (PRO feature). It also improves motion accessibility, search behavior, and the reliability of several live data views.

Plus, as always, performance improvements and bug fixes.

### 2.19 — 2026-08-08

Version 2.19 makes it easier to share your progress and racquet insights with polished visual cards, and to contact us from Settings when you need help or want to suggest an improvement. You can turn supported String Health, string-job, milestone, and playing-streak details into a shareable image, then preview it in the shape that fits where you want to post it. The measurement tutorial is also more comfortable on compact screens.

Plus, as always, performance improvements and bug fixes.

### 2.18 — 2026-08-06

Version 2.18 adds safer backup import and restore, more useful measurement-quality Insights, and stronger freshness handling for time-based views. You can inspect and restore a backup from Settings with clearer safeguards, learn from patterns in your saved measurements, and get guidance that stays current as a new day begins.

Plus, as always, bug fixes and performance improvements.

## Related topics

[racket tension](https://appshunter.io/ios/topics/racket-tension) · [string tension meter](https://appshunter.io/ios/topics/string-tension-meter)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*