DeadlinePing

DeadlinePing sends deadline reminders to colleagues, clients, friends, and yourself through Email, Telegram, LINE, MAX, and Push. Recipients don't need to register; reminders arrive on their preferred channel at the scheduled time. You set the message, recipient, and deadline, then choose delivery points from two weeks down to three minutes before the event. Delivery history and status tracking show whether each reminder was delivered. It works in the browser and as a native app.