TimeSignals

TimeSignals is an iPhone app that adds hourly time signals with optional voices in Japanese or English. You can schedule 30-minute chimes from 00:00 to 23:30 on the time settings screen, and the signal will play even when the app isn’t running (Do Not Disturb may suppress sound).

Choose from three sound modes: Time Signal (spoken announcements without stating the exact time), Cuckoo Clock (hours on the hour and once at the half-hour), and Chime (hour vs. half-hour without indicating the exact time). This gives flexibility for spoken reminders or simple alerts. For support, contact the in-app email; the Japanese voice data is sourced from amitaro.net.