Developing a Mobile App for a Golf Club
A golf app is a niche product with specific requirements: precise course map with distances, stroke counter with hole analytics, handicap system, tee time booking. The audience is solvent and demanding—a cheap solution won't be accepted.
Course Map and Distances
Main on-course function—know distance to pin (flag) and hazard zones. GPS-measured distance to predefined course points.
Golf course map: satellite imagery (Google Maps Satellite / Mapbox Satellite) as base + SVG overlays for fairways, bunkers, water hazards, greens. SVG course data either purchased from GolfLogix/Golf Genius (covering 40,000+ courses) or manually digitized from satellite (for small non-standard courses).
Distance to pin: pin coordinates for each hole set in advance. CLLocation(latitude: pinLat, longitude: pinLon).distance(from: userLocation)—instant, no API. Display in meters and yards (user setting). Distance to front and back green boundary—same, three points per green.
Distance to hazards (water, bunker): tap zone → show distance to nearest edge. Turf.nearestPointOnLine for hazard polygon.
Extra premium UX: distance to fairway each hole during navigation with FollowCamera in Mapbox—course auto-centers on player.
Stroke Counter
Simple but requires good UX. On green grass with sun—screen must be readable in gloves. Large +/− buttons, high brightness, dark-friendly mode.
Data structure: Round (round) → HoleScore[]. Each HoleScore: hole_number, strokes, putts, fairway_hit (bool), green_in_regulation (bool), penalties, notes.
Round statistics: total strokes, difference to par (+3, −1, etc.), average putts. Round history—calendar + handicap trend.
Handicap System
World Handicap System (WHS)—international standard since 2020. Calculation: Score Differential = (Adjusted Gross Score − Course Rating) × 113 / Slope Rating. Handicap Index—average of best 8 from last 20 differentials.
Course data: Course Rating and Slope Rating from USGA / EGA database (open for licensed partners) or entered manually per course. Handicap calculation—on server after each recorded round, user notification.
Tee Time Booking
Tee time booking: grid of available slots by day, player count selection, confirmation. Integration with course management systems: GolfNow, EZLinks, Golf Genius—they have APIs for third-party app bookings. For clubs without external system—own booking backend.
Payment on booking—Stripe. Cancellation with refund per club rules (configurable: free within 24h, penalty less than 2h).
Club Events and Feed
Tournaments, competitions, lessons—calendar view with registration. Push notifications 24h and 1h before event. Tournament leaderboard real-time—WebSocket for live table updates.
Timeline
Basic app (map with distances, stroke counter, booking)—4-8 weeks. Full version with WHS handicap, GolfNow integration, tournament module—3-4 months. Cost estimated individually; significantly depends on club's existing booking systems.