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Apple ID6757102423
Bundle IDcom.dragons.tennisstringmaster
SellerSeller
Min iOS15.6
Min macOS12.5
Device familiesiphone, ipod
Released2025-12-31
Copyright© 2025 Dean Kim
Privacy policyLink ↗
Preview 1 platform
iPhone 10 images
What’s New Version 1.7.8
- 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.
Description
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).
Accessibility
ipadiphonemacrealityDevicetvoswatch
Version history 25 versions
Build 887367906v1.7.82026-06-24 16:54:04
- 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.
Build 887239478v1.7.72026-06-21 17:42:26
- 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
Build 886762250v1.7.62026-06-10 17:01:21
- 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.
Build 886312812v1.7.52026-05-30 16:27:40
Enhanced String Finder Wizard: Discover your perfect string through a professional 3-step recommendation flow.
Database Precision Update: Technical specifications updated for 24 key models including Restring, Toroline, and Tru Pro for superior accuracy.
Expert Knowledge System: Educational guides on string materials and performance metrics are now available in 10 languages.
Normalized Comparison Engine: Re-engineered recommendation logic using standardized data for fairer string comparisons.
General performance improvements and bug fixes.
Build 886132669v1.7.12026-05-26 18:04:30
- security hardening: we’ve overhauled our backend row-level security (rls) and database encryption protocols. your racket and string logs are now guarded by the latest industry standards.
- fcm security audit: we’ve tightened the security on our push notification engine. your restring reminders are now delivered through an even more secure, encrypted channel.
- stability patch: fixed a few minor under-the-hood bugs related to data synchronization.
Build 886061882v1.7.02026-05-25 00:10:48
- native community insights: view real-time global statistics including total community playtime and trending string rankings directly on your dashboard.
- educational tooltips: learn the science behind your gear with built-in guides on dead poly, tension loss, and stiffness.
- smart push notifications: never miss a restring reminder or critical update with our new server-side alert engine.
- seamless onboarding: improved first-time user experience with intuitive guides and standardized terminology.
- resolved a bug preventing users from adding their very first playtime log via the calendar view.
Build 885769043v1.6.82026-05-18 00:11:30
v1.6.8 critical ui and stability update:
fixed a major layout bug where dashboard action buttons were clipped on certain screen sizes or with high text scaling. the interface now dynamically adjusts to ensure all elements remain fully visible and clickable. improved overall system reliability and data presentation to keep your gear tracking rock-solid.
Build 885741845v1.6.72026-05-17 03:45:56
v1.6.7 emergency ui hotfix:
fixed a critical layout bug where dashboard buttons were clipped on certain screens or with large text scaling. the
card now dynamically adjusts its height to ensure all buttons are fully visible and clickable. optimized the user
interface for better accessibility and overall system reliability.
Build 885323793v1.6.62026-05-06 18:28:52
v1.6.6 brand catalog and navigation stability:
implemented a comprehensive racquet brand catalog for consistent gear management. fully resolved a critical navigation bug where logging from the string search screen failed to properly route back to the form. improved data injection and context handling to ensure seamless tracking and rock-solid stability.
Build 885296336v1.6.52026-05-05 23:15:37
v1.6.5 pro gear and dashboard polish:
added custom drag and drop reordering for active cards on the home screen. supports advanced racquet specs including weight, stiffness, and swing weight. fixed text overflow and redesigned history icons for better visibility. improved finder filter initialization and data accuracy for string performance specs.
Build 885104325v1.6.22026-04-30 18:48:19
v1.6.2 stability & precision update:
- fixed numerical lbs/kgs unit conversion bug for accurate tracking.
- streamlined onboarding with auto-skip and data pre-fill for returning users.
- added logout confirmation to prevent accidental data loss.
- restored mandatory terms of service consent check.
- optimized temperature toggle and improved overall system responsiveness.
Build 885002189v1.6.12026-04-28 01:27:26
real-time health refresh: fixed the sync bug where string health didn't update immediately after logging play sessions. now it’s instant!
tension sync fix: resolved an issue where the dashboard tension display didn't match your actual logs.
snappy ui: improved the responsiveness of the "edit details" page. no more multiple taps needed to get where you want to go.
racquet management polish: refined the data sync logic for your racquet list and restring history to keep everything rock-solid.
Build 884483376v1.6.02026-04-17 15:47:47
- advanced finder: filter by material, gauge, and tension. use smart sorting or find similar alternatives.
- sensory logging: record feel (soft, crisp, stiff) plus weather and temperature context.
- custom lifespan: set manual hour limits per racket for accurate health warnings.
- visual history: intuitive icons in calendar and list views for better tracking.
- data sync: fixed notification mapping and real-time health dashboard updates.
Build 883648635v1.5.02026-03-23 20:24:44
Added Calendar view to visualize tennis activity with color-coded string status.
Introduced chip-based racket filtering for playtime history.
Enabled past string job backfilling and smart playtime backdating.
Real-time health recalculation when editing, switching, or deleting logs.
String gauge and mm override for precise gear personalization.
Forced racket selection logic for multi-active string setups.
Added calendar date restrictions for data consistency.
Build 883135537v1.4.22026-03-12 01:30:06
[New] Manual language selection in Settings (10 languages).
[New] Dynamic date formatting for a localized experience.
[Fixed] Dashboard now refreshes instantly after logging a job.
[Fixed] Hybrid detection bug & bottom nav translation sync.
[Compliance] Added TWU data attribution & legal disclaimers.
[UI] Added character limits for racket names.
Build 882908773v1.4.12026-03-04 16:40:43
[Global Expansion & UX Improvements]
Added Portuguese support (10 languages total).
Racket Spec Notes: Track custom tuning details like weight and balance.
Smart Tension: Independent main/cross inputs for full bed setups.
Nickname Priority: Racket nicknames are now prioritized on the home screen.
Rate Us & Feedback: Send feedback directly from your profile settings.
Fixed language fallback bugs and restring data issues.
Build 882628427v1.4.02026-02-26 22:46:32
string master version 1.4.0
major features
smart routine logging: set your usual schedule once and log your session with a single tap from your lock screen. it is the fastest way to track your play.
global expansion: added support for german, french, and italian. we now support 8 languages.
advanced hybrid search: find strings faster by typing brand and model (like "head synthetic") with our new multi-word filtering logic.
bug fixes and improvements
enhanced routine sync: your routines and notifications now stay perfectly in sync across all your devices.
consistent string naming: enjoyed a unified "brand + model" display across all screens for better readability.
math logic fix: corrected an error where custom strings were penalized with a 20% tension loss by default.
ui polish: fixed the "null" text rendering bug in the racket details screen.
Build 882527619v1.3.12026-02-19 10:15:58
Sign-up Fixed: Squashed the email sign-up error.
1-Sec Social Login: Skip typing! Log in instantly with Google/Apple.
Auto Data Merge: Guest logs automatically save to your new account.
Notifications: Manage restring reminders in your Profile.
In-App Reviews: Easily leave a rating right inside the app!
Stability: Smoother logins & data transfers.
Build 882248558v1.2.12026-02-10 16:32:41
[Ver 1.2.1 Update]
Smart Restring: Log your jobs in seconds! Simply tap "Restring" on the Home screen to duplicate your previous setup. Skip the search and finish in just 3 seconds!
Custom String Input: Can't find your string in the list? You can now manually enter any string brand or model using the new 'Custom Input' feature.
Flexible Reminders: We've added more reminder intervals. You can now set precise restring alerts for 2 weeks, 1 month, 3 months, and more.
Improvements: Enhanced Guest Mode usability and general app stability improvements.
Build 881831598v1.2.02026-01-28 14:24:23
[Ver 1.2.0] Login, Units, and Precision!
Verification Codes (OTP): We’ve replaced email links with 6-digit codes. Sign up and log in instantly without leaving the app.
Kg / Lbs Support: You can now toggle your preferred unit in Profile settings. Track your jobs in Kilograms (kg) or Pounds (lbs).
Precision Input: Added text fields for tension. You can now type exact numbers (e.g., 23.5 kg) alongside the sliders.
Improvements: Fixed email verification issues for a smoother experience.
Build 881658282v1.1.42026-01-21 19:57:50
Big Update! You can now create an account to save your data permanently.
• Email Sign-up & Login: Secure your string logs and racket setups in the cloud.
• Guest Account Linking: Already using the app? Easily convert your Guest account to a Full account without losing any history.
• Password Reset: Added support for password recovery.
• Bug fixes and performance improvements.
Build 881388741v1.1.22026-01-16 07:54:23
v1.1.3 Update: Smart Notifications & Enhanced Stability
• Push Notifications: Get alerts when your strings need restringing to maintain peak performance
• Restring Reminders: Receive timely notifications every 3 months to keep your rackets in top condition
• String Health Tracking: Monitor your string durability with real-time health percentage
• Bug Fixes & Improvements: Improved app stability and performance across iOS
Build 881231142v1.1.12026-01-06 19:23:28
Racket Management Update!
• Manage Rackets: You can now add, edit, and delete your rackets more easily.
• Add Button: Quickly register new equipment with the new '+' button.
• Roadmap Update: We've outlined exciting Pro features coming soon (Watch app, Analytics)!
Small fixes and improvements included. Enjoy your game!
Build 881190464v1.1.02026-01-05 15:28:15
Tennis Ball Emoji: Updated the racket icon to a tennis ball for better vibes!
Improved Racket Management: Now you can edit both the Nickname and Model Name of your rackets.
Profile Update: Easier access to edit your profile settings.
Fixed minor bugs and improved performance.
Build 881035887v1.02025-12-31 15:27:56
No pricing data captured yet — comparisons appear once the app has paid storefronts or in-app purchases.
Availability 1 of 1 storefronts
| Region | Language | Price | Ratings | Avg | Version |
|---|---|---|---|---|---|
| US | en-US | Free | 7 | 5.0 | 1.7.8 |
Change log 29 changes · US
✎
releaseNotes updated
- fixed startup crashes on sideloaded or restored devices.
- resolved route parsing RangeErrors during OS background process recovery.
- improved session refres
✎
description updated
Stop guessing, start tracking. String Master is the ultimate performance-tracking companion for tennis players who demand the best from their equipment.
Whethe
✎
subtitle updated
Track Tension & Durability
✎
name updated
String Master - Tennis Log
◆
Version 1.7.8 released
- 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 pipe
◆
Version 1.7.7 released
- 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 confirmat
◆
Version 1.7.6 released
- 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 u
◆
Version 1.7.5 released
Enhanced String Finder Wizard: Discover your perfect string through a professional 3-step recommendation flow.
Database Precision Update: Technical specifications updated for 24 key models including Restring, Toroline, and Tru Pro for super
◆
Version 1.7.1 released
- security hardening: we’ve overhauled our backend row-level security (rls) and database encryption protocols. your racket and string logs are now guarded by the latest industry standards.
- fcm security audit: we’ve tightened the security
◆
Version 1.7.0 released
- native community insights: view real-time global statistics including total community playtime and trending string rankings directly on your dashboard.
- educational tooltips: learn the science behind your gear with built-in guides on dea
◆
Version 1.6.8 released
v1.6.8 critical ui and stability update:
fixed a major layout bug where dashboard action buttons were clipped on certain screen sizes or with high text scaling. the interface now dynamically adjusts to ensure all elements remain fully visib
◆
Version 1.6.7 released
v1.6.7 emergency ui hotfix:
fixed a critical layout bug where dashboard buttons were clipped on certain screens or with large text scaling. the
card now dynamically adjusts its height to ensure all buttons are fully visible and clickable.
◆
Version 1.6.6 released
v1.6.6 brand catalog and navigation stability:
implemented a comprehensive racquet brand catalog for consistent gear management. fully resolved a critical navigation bug where logging from the string search screen failed to properly route b
◆
Version 1.6.5 released
v1.6.5 pro gear and dashboard polish:
added custom drag and drop reordering for active cards on the home screen. supports advanced racquet specs including weight, stiffness, and swing weight. fixed text overflow and redesigned history icon
◆
Version 1.6.2 released
v1.6.2 stability & precision update:
- fixed numerical lbs/kgs unit conversion bug for accurate tracking.
- streamlined onboarding with auto-skip and data pre-fill for returning users.
- added logout confirmation to prevent accid
◆
Version 1.6.1 released
real-time health refresh: fixed the sync bug where string health didn't update immediately after logging play sessions. now it’s instant!
tension sync fix: resolved an issue where the dashboard tension display didn't match your actual logs.
◆
Version 1.6.0 released
- advanced finder: filter by material, gauge, and tension. use smart sorting or find similar alternatives.
- sensory logging: record feel (soft, crisp, stiff) plus weather and temperature context.
- custom lifespan: set manual hour
◆
Version 1.5.0 released
Added Calendar view to visualize tennis activity with color-coded string status.
Introduced chip-based racket filtering for playtime history.
Enabled past string job backfilling and smart playtime backdating.
Real-time health recalculation
◆
Version 1.4.2 released
[New] Manual language selection in Settings (10 languages).
[New] Dynamic date formatting for a localized experience.
[Fixed] Dashboard now refreshes instantly after logging a job.
[Fixed] Hybrid detection bug & bottom nav translation sync.
◆
Version 1.4.1 released
[Global Expansion & UX Improvements]
Added Portuguese support (10 languages total).
Racket Spec Notes: Track custom tuning details like weight and balance.
Smart Tension: Independent main/cross inputs for full bed setups.
Nickname Prior
◆
Version 1.4.0 released
string master version 1.4.0
major features
smart routine logging: set your usual schedule once and log your session with a single tap from your lock screen. it is the fastest way to track your play.
global expansion: added support for germ
◆
Version 1.3.1 released
Sign-up Fixed: Squashed the email sign-up error.
1-Sec Social Login: Skip typing! Log in instantly with Google/Apple.
Auto Data Merge: Guest logs automatically save to your new account.
Notifications: Manage restring reminders in your Profi
◆
Version 1.2.1 released
[Ver 1.2.1 Update]
Smart Restring: Log your jobs in seconds! Simply tap "Restring" on the Home screen to duplicate your previous setup. Skip the search and finish in just 3 seconds!
Custom String Input: Can't find your string in the list? Y
◆
Version 1.2.0 released
[Ver 1.2.0] Login, Units, and Precision!
Verification Codes (OTP): We’ve replaced email links with 6-digit codes. Sign up and log in instantly without leaving the app.
Kg / Lbs Support: You can now toggle your preferred unit in Profile sett
◆
Version 1.1.4 released
Big Update! You can now create an account to save your data permanently.
• Email Sign-up & Login: Secure your string logs and racket setups in the cloud.
• Guest Account Linking: Already using the app? Easily convert your Guest account to
◆
Version 1.1.2 released
v1.1.3 Update: Smart Notifications & Enhanced Stability
• Push Notifications: Get alerts when your strings need restringing to maintain peak performance
• Restring Reminders: Receive timely notifications every 3 months to keep your rackets
◆
Version 1.1.1 released
Racket Management Update!
• Manage Rackets: You can now add, edit, and delete your rackets more easily.
• Add Button: Quickly register new equipment with the new '+' button.
• Roadmap Update: We've outlined exciting Pro features coming so
◆
Version 1.1.0 released
Tennis Ball Emoji: Updated the racket icon to a tennis ball for better vibes!
Improved Racket Management: Now you can edit both the Nickname and Model Name of your rackets.
Profile Update: Easier access to edit your profile settings.
Fixed
◆
Version 1.0 released