I am unaware of any other apps (besides Phone) that, by default, alert audibly on both devices regardless of Wrist Detection settings.
How Notifications behave can vary, depending upon your settings. Without Wrist Detection enabled, all notifications will go to both devices. With it enabled (and with the watch unlocked and on your wrist), they will behave as outlined in my previous reply.
Incoming phone calls will always ring on both devices by default. However, these can also behave differently depending on your settings or connected devices. For example:
- You can set the Ringer to silent on your iPhone (by using the switch on the side).
- You can set one, the other or both devices to Do Not Disturb.
- You may have a Bluetooth headset connected to one device or the other.
- You can customise settings for your watch: Apple Watch app > My Watch > Notifications > Phone > Choose Custom > under Ringtone, disable Sound and/or Haptic.
I appreciate why you consider your question to be germane to this thread. Whilst it does also concern alerts and notifications (as many questions do), it is nevertheless different and so merits a separate thread. Replies here should be answers to the OP's question (which is already marked as solved).
- OP's question: "I want to receive notification alerts from all apps on both my watch and iPhone all of the time. Is there a configuration option for this?"
- Yours: "besides the Phone app, are there any other Apple or third party apps that always alert both devices by default?"