santaku - Reply in 3 Taps

Reply in just three taps. santaku offers three ready-made replies—pick one and the chat keeps flowing. Now the options fit your relationship even better.

Stop agonizing over how to reply.

santaku is a messenger with a simple twist: replies are mostly three taps. When a message arrives, AI reads the flow of your conversation and prepares three ways you could respond. You just tap one—and the chat moves forward.

No more time spent typing. No more time spent overthinking.

— Rally in threes When someone sends a free-text message, the person receiving it sees three reply options. Tap one and those words are sent as your reply. The person who receives it then sees three options of their own. Back and forth you go—three taps at a time—until either of you chooses to type freely again.

— Choose your tone The three options are written to match the tone you prefer: • Positive / Neutral / Negative • Warm / Casual / Formal • Agree / Ask / Close Switch anytime in settings to fit your mood or who you're talking to.

— Free text, always Three taps take the lead, but your own words are never more than a tap away. Tap "write my own" whenever you want to say something in your own voice. The three choices are for ease; free text is for feeling. Both are yours.

— Built to feel safe • Block and report anyone who bothers you • Inappropriate words are filtered before a message is ever sent • Reported content is reviewed and acted on by our team • By default, you only exchange messages with people you mutually follow (adjustable in settings)

— Japanese and English The app follows your device language automatically, and you can switch anytime in settings.

The lowest possible bar to reply. santaku makes conversation effortless.

From plan8 Inc. (Yufu, Oita, Japan)