New users get a free 7-day Premium trial — no credit card required.

String GOAT is the all-in-one tennis string tracker for players who want to get the most out of every tennis restring. Whether you string your own racket as a DIY stringer or take it to a shop, String GOAT logs your tennis string setup, tracks tension across every restring, rates tennis string performance with radar charts, and delivers AI-powered tennis string recommendations — all in one app.

KEY FEATURES

■ Tennis String & Racket Management
• Log detailed tennis string specs: brand, model, type, tension, diameter
• Record racket specs: brand, model, head size, weight, grip size, stiffness (RA)
• Hybrid tennis stringing support (separate mains & crosses)
• Unlimited rackets with Pro

■ Tennis Restring History
• Every tennis restring logged with date, tension, gauge
• Automatic restring interval calculation
• Per-racket tennis string history at a glance
• DIY stringer friendly: log your own restring jobs and stringing machine

■ Performance Feedback
• Rate 6 key areas: Power, Spin, Control, Comfort, Feel, Durability
• Visualize tennis string ratings with interactive radar charts
• Add detailed comments for each category
• Share feedback as images on social media

■ Statistics & Charts
• Tension history graph (mains vs. crosses over time)
• Tennis string type distribution chart
• Filter by racket for focused analysis

■ AI Tennis String Lab
• AI-powered tennis string recommendations based on your restring data and feedback
• Tension advisor tailored to your tennis stringing history
• AI Chat for personalized tennis restring advice

■ Home Screen Widget
• Check current tennis string status at a glance
• Days since last restring and average rating
• Quick access to add new tennis string records

■ Cloud Sync & Backup
• Sync tennis restring data across devices
• Cloud backup and restore
• Export your tennis string records to Excel

■ Stringer Customer Management (Premium)
• Manage tennis string history per customer
• From DIY stringers to pro tennis stringers

■ 13 Languages Supported
English, Korean, Japanese, Chinese (Traditional & Simplified), German, Spanish, French, Italian, Portuguese, Turkish, Hindi, Indonesian

SUBSCRIPTION PLANS

• Free: 1 racket, unlimited tennis string records, AI string recommendations
• Pro: Unlimited rackets, cloud sync, backup/restore, Excel export, 500 AI recommendations/month
• Premium: Everything in Pro + Stringer Customer Management + 3,000 AI recommendations/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.