Differences between ntfy.sh and ntfy.4d2.org

If you're already familiar with ntfy, here's a quick list of differences between the flagship instance at ntfy.sh and our instance at ntfy.4d2.org:

1. No paid tiers are available on ntfy.4d2.org; all users have the same default tier of service.
2. Since we anticipate that many users will be using ntfy due to privacy concerns, we do not have an upstream connection to ntfy.sh or Firebase Cloud Messaging. Notification delivery will be less reliable compared to ntfy.sh for iOS users.
3. Reserved topics and telephone notifications are not currently available on ntfy.4d2.org.
4. ntfy.4d2.org has higher limits than the lowest ntfy.sh paid tier for messaging volume and attachment storage.
5. ntfy.4d2.org has a higher attachment size limit to align with the attachment size limits on our other services.
6. 4d2.org services are exempted from rate-limiting when connecting to ntfy.4d2.org.