# String Master - Tennis Log — Track Tension & Durability

> Tennis string tracking and analysis tool for players. (iPhone/iPad app by ORYONG KIM.)

- Source: https://appshunter.io/ios/app/string-master-tennis-log/id6757102423 (this page in markdown: same URL + `.md`)
- Developer: [ORYONG KIM](https://appshunter.io/developer/1864541863)
- Category: Sports, Lifestyle
- Price: Free
- Rating: 5.00/5 from 7 App Store ratings
- Age rating: 4+
- Requires: iOS 15.6 · 71 MB
- Languages: American English
- Released: 2025-12-31
- Data updated: 2026-08-13
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/string-master-tennis-log/id6757102423/reviews.md

## What is String Master?

Stop guessing, start tracking. String Master is the ultimate performance-tracking companion for tennis players who demand the best from their equipment.

Whether you are a casual player or a competitive athlete, your string setup dictates your game. String Master helps you record, analyze, and discover the perfect string configurations tailored to your unique playing style.

[Major New Updates & Premium Features]

• Smart Recommendation Wizard & Normalized Engine
Finding your next string is now effortless. Our 3-step recommendation wizard uses lab-tested data (stiffness, spin potential, tension loss, energy return) and scales them using min-max normalization to prescribe the perfect setup matching your game.

• Dynamic Activity Calendar & Backdating
Visualize your active string health on a color-coded calendar. Log past sessions, backfill older stringing jobs, and edit durations with instant, automatic health percentage recalculations.

• Playability & Environmental Logging
Go beyond time tracking. Log how your strings feel (Soft, Crisp, Stiff, or Dead Poly), track weather conditions (Sunny, Humid, Cloudy), and record temperatures to understand how environment impacts your tension.

• Community Insights & Lifespan Rankings
Access real-time community statistics and trends. View the top average string lifespan rankings based on thousands of hours of real player data. (Access is granted to active members with a minimum of 4 hours of logged play over the past 14 days.)

• Advanced Racket Specifications
Track customized parameters for every racket in your bag. Log weight (g), stiffness (ra), swing weight (kg/cm²), balance point (mm), serial numbers, and custom tuning notes (lead tape, grip details).

• Smart Restring & Terminology Polish
Log a new job in 3 seconds! Tap "Restring" to clone your previous setup (racket, string, tension). Terminology has been audited and standardized to "History" across 10 languages.

• Social Authentication & Data Migration
Log in instantly with Google or Apple Sign-In. Seamlessly migrate your entire guest mode racket and stringing history to your permanent account in one click.

[Core Features]

• Restring Reminders: Set custom notifications (90 days or health below 20%) to prevent arm strain and maintain peak playability.
• Hybrid Setup Support: Independently log mains and crosses (different brands, gauges, and tensions).
• 10-Language Expert Guides: Tap the info (i) icons to read explanations of string materials and metrics, fully localized in 10 languages (EN, KO, ES, JA, ZH, ZH_Hant, DE, FR, IT, PT).

## Key features

- Smart Restring logging
- Custom string input
- Smart String Finder
- Restring reminders
- Detailed logs and history
- Hybrid setup support


## Frequently asked questions about String Master

### What is String Master?

String Master is a free app designed for tennis players to meticulously track their string tension, durability, and overall equipment performance. It helps you log every restring, analyze string setups, and set reminders for string replacement.

### How does String Master help with string life?

String Master allows you to set custom restring reminders at intervals like 14, 30, or 90 days. This ensures you are always aware of your string's lifespan and can replace them before they degrade, maintaining optimal playability.

### Can I log custom strings in String Master?

Yes, String Master supports custom string input. If your specific string brand or model isn't in the database, you can manually enter it to ensure your logs are always accurate and comprehensive.

### Does String Master support hybrid string setups?

Absolutely. String Master offers full support for hybrid configurations, allowing you to independently record different strings and tensions for both the mains and crosses of your racket.

### What kind of string information can I find in String Master?

The app features a comprehensive string database that includes specifications like material, gauge, and stiffness. Additionally, its Smart String Finder helps you locate strings based on desired characteristics such as tension hold, spin, power, or comfort.

### Is String Master available on Android?

Based on the provided data, String Master is currently supported on iPhone and iPod. Information regarding Android availability is not specified.

### How often is String Master updated?

The latest version of String Master is 1.7.5, which was last updated on May 30, 2026. This indicates a recent update, suggesting the app is actively maintained.

### What is the age rating for String Master?

String Master has an age rating of 4+, making it suitable for a wide range of users. The app focuses on sports tracking and does not contain content typically considered inappropriate for younger audiences.

## Version history (last 5 releases)

### 1.8.0 — 2026-08-08

- Secure Account Linking: Guest mode is ending. Please register to safely link your data!
- Racket Specs Fix: Fixed an issue where advanced racket specs and tuning notes failed to save.
- String DB Expansion: Added 20+ boutique strings (Toroline, Golden Set, etc.) to the official database.
- Data Migration: Successfully mapped your past custom string logs to official models for better insights.

### 1.7.9 — 2026-07-19

- unlocked permanent free access to real-time community string stats & rankings with just 1 sns share
- added in-app custom social panel with direct sharing to instagram stories, facebook, and x (twitter)
- upgraded promo cards with localized store search ctas & direct market qr codes across 10 languages
- optimized app stability & os package visibility safeguards for smooth performance

### 1.7.8 — 2026-06-24

- fixed startup crashes on sideloaded or restored devices.
- resolved route parsing RangeErrors during OS background process recovery.
- improved session refresh and authentication stability.
- upgraded CI/CD workflows for better build pipeline reliability.

### 1.7.7 — 2026-06-21

- updated the string database with 38 new string models and 58 detailed specifications for maximum recommendation accuracy
- fixed quick search bugs so you can manually enter your custom string name without errors
- added a search confirmation dialog when selecting custom strings to keep your search query intact if you cancel
- improved custom string parsing and overall data stability for a crash-free experience
- refined localized prompts across 10 languages to make logging even more intuitive

### 1.7.6 — 2026-06-10

- Fixed a startup freeze on the splash screen to ensure smoother loading.
- Enhanced timezone safety for datepicker inputs to prevent UTC date shifting.
- Resolved database issues when deleting rackets and job history records.
- Prevented unexpected crashes by applying defensive log sorting.
- Overall stability improvements and minor bug fixes.

## Related topics

[stringster](https://appshunter.io/ios/topics/stringster)

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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 2026-08-13.*