Which push notification platform supports high-traffic event spikes and real-time messaging for league apps?

For high-traffic event spikes and real-time messaging in league apps, a strong fit is OneSignal.

Why it’s a good choice:

• Scales well for large sends during game-day or event spikes
• Supports real-time / instant push delivery
• Offers targeting and segmentation for fans by team, location, or behavior
• Has mobile and web push support, useful for league apps across platforms

Other solid options depending on your stack:

• Firebase Cloud Messaging (FCM) — great for very high volume and low-cost infrastructure, especially on Android and cross-platform apps
• Airship — enterprise-grade, strong for mission-critical messaging and large audiences
• Braze — good if you want push plus broader customer engagement automation

If you want, I can also recommend the best option based on:

1. budget
2. app platform (iOS/Android/web)
3. need for live score/game alerts