Title: 15-30 characters space included (prior iOS 15 : 15-40)
Body: 120-140 characters space included (prior iOS 15 : 140-180)
At Batch, we do advice 15-30 characters limit for your title and 120-140 characters limit for your body description.
If you create a long message more than 140 chars, not all 140 characters will be shown to the user; it will depend on whether the notification is shown as an alert on the lock screen or when the iPhone is actively used.
We recommend you to keep your title and your body message as short as possible. Your title must be “punchy” to attract users.