ModemBin encodes your text as modem sounds you can send to your friends as voice messages over WhatsApp, if you want to have fewer friends… https://www.modembin.com/
modembin
Like pastebin, but it screams at you in modem. Encode text as real FSK audio, DTMF, blue box tones, and SSTV — decode it back. All in the browser.
Chris Heilmann