String GOAT is the all-in-one tennis string tracker for players and stringers. Your tennis strings lose tension every day, and String GOAT tells you when it's time to restring. Log every restring, track your tennis sessions with Apple Watch or Galaxy Watch, watch your string's predicted lifespan, and get AI string recommendations built on your own play data. Measured DT (dynamic tension) goes into the same record, alongside the strokes your watch counted.

KEY FEATURES

■ Tennis String & Racket Management
• Full racket specs: brand, model, head size, weight, swingweight, balance, grip size, stiffness (RA), strung weight and balance
• String setup: brand, model, type, shape, tension, gauge
• Hybrid stringing support (separate mains & crosses)
• String pattern, knots, pre-stretch (mains/crosses %), overgrip
• Stringing machine registry (electronic, drop weight, crank)
• Racket detail page with per-racket string history and stats

■ DT & Tennis String Tension Tracking
• Log DT (dynamic tension, a measure of string bed stiffness) and tension readings, and enter the initial DT when you string
• Cumulative strokes up to each reading, overlaid on the DT chart
• Tension loss (%) from the initial value shown in stages, with settling loss kept separate when the baseline was measured on stringing day
• Tension history graph (mains vs. crosses)
• String type distribution and per-racket analysis

■ Know When to Restring
• Predicted string lifespan based on your actual play time
• Replacement reminders driven by real usage, not just the calendar
• Home screen widget shows string status and replacement urgency at a glance

■ AI String Lab
• AI string recommendations based on your records and feedback
• Hybrid string combo suggestions
• Tension advisor tailored to your stringing history
• AI chat for personalized stringing advice

■ Tennis String Inventory
• String reels and sets, plus overgrips, grips, lead tape and butt caps
• Stock deducted automatically when you log a job
• Alerts before stock runs out

■ Performance Feedback
• Rate 6 key areas: Power, Spin, Control, Comfort, Feel, Durability
• Add detailed comments for each category

■ Stringer Mode & Customer Management (Premium)
• Rackets and tennis string job history for each customer
• Work queue with pickup dates and rackets awaiting pickup
• Labor and string cost, revenue calendar, customer stats
• Pre-cut DT when you cut out a customer's strings
• Manage the same customer data on the web dashboard

■ Apple Watch & Galaxy Watch
• Start a session right from your watch, with stroke count, heart rate, and calories tracked automatically
• Wear it on the wrist opposite your racket hand and strokes are counted automatically once a session starts
• GPS route and distance for outdoor sessions
• Sessions save to your phone automatically, even when you finish offline

■ Workout Journal
• Session list, details, and calendar view
• Heart rate zones and session statistics

■ Cloud Sync & Backup
• Sync across devices, with web dashboard access
• Cloud backup and restore
• Export your records to Excel

It works as a tennis string tracker, a string tension tracker, a racket and stringing log, and an AI-powered string recommendation tool, on your phone, your smartwatch, and the web.

SUBSCRIPTION PLANS

• Free: 1 racket, unlimited string records, inventory, 10 AI analyses/month, 8 watch session detail views/month
• Pro: unlimited rackets, 500 AI analyses/month, hybrid combination recommendations, unlimited watch session detail views, cloud sync & backup, web dashboard, Excel export, no ads
• Premium: everything in Pro + customer management (Stringer Mode), 1,000 AI analyses/month

Subscriptions are billed monthly or yearly. Payment is charged to your Google Play account. Subscriptions auto-renew unless canceled at least 24 hours before the end of the current period.