We've all been there: the perfect, cutting reply. The 2am text to an ex. The reply-all you'll regret by lunch. You know you shouldn't send it — but in the moment, you do anyway. The Echo Sink is a different kind of outbox. Write exactly what you're feeling, then sink it — instead of sending it, it drops into a cooling reservoir behind a timer you set. While it cools, the text stays hidden. When the timer runs out, it surfaces, ready to copy and send — if you still mean it. Most of the time…