Apple Push Notification Service (APNs)
Apple's HTTP/2-based REST API for sending push notifications to iOS, macOS, tvOS, and watchOS devices. Delivers alert, background, and silent notifications to registered device tokens with priority and expiry controls.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
HTTPS/HTTP2 mandatory. JWT signed with ES256 using P8 private key. Private keys are downloaded once from Apple Developer portal — cannot be re-downloaded, must be stored securely. All communication encrypted end-to-end. Device tokens are pseudonymous identifiers.
⚡ Reliability
Best When
An agent needs to deliver real-time notifications directly to Apple device users with full control over payload and priority.
Avoid When
You need cross-platform push to Android/web, or require marketing analytics on top of basic delivery.
Use Cases
- • Send push notifications to iOS and macOS apps
- • Deliver silent background updates to trigger app refresh
- • Manage notification priority (immediate vs power-efficient)
- • Send time-sensitive notifications that bypass Focus modes
- • Track delivery receipts via APNS feedback service
Not For
- • Android devices (use Firebase Cloud Messaging / FCM instead)
- • Web push notifications (use Web Push Protocol or a wrapper service)
- • High-volume marketing campaigns at scale (use a wrapper like OneSignal or Braze)
Interface
Authentication
Two auth methods: (1) JWT token-based auth using P8 private key signed with ES256 — tokens expire after 1 hour and must be rotated. (2) TLS client certificate auth (legacy, being deprecated). JWT is the recommended modern approach. Sandbox and production use different endpoints.
Pricing
APNs itself is free. Cost is the Apple Developer Program enrollment ($99/year). No per-notification fees.
Agent Metadata
Known Gotchas
- ⚠ HTTP/2 is REQUIRED — HTTP/1.1 connections are rejected; ensure your HTTP client supports HTTP/2
- ⚠ JWT tokens expire after 1 hour — agent must regenerate before expiry or receive 403 ExpiredProviderToken
- ⚠ Device tokens expire — Unregistered error means token is invalid and should be purged from your database
- ⚠ Sandbox (development) and production endpoints are different URLs — mixing them causes silent delivery failures
- ⚠ Certificate-based auth is being phased out — migrate to JWT token auth if still using certificates
- ⚠ Payload size limit is 4KB for most notifications, 5KB for VoIP
Alternatives
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Scores are editorial opinions as of 2026-03-06.