The best alternatives to Ninja Number are Burner Mail, Shuffle, and Maybe. If these 3 options don't work for you, we've listed a few more alternatives below.
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Universal-2 by AssemblyAI— Speech-to-Text API for conversational data
Truly disposable, easy to manage email addresses that protect you and your life from being constantly analysed and spammed to death. Burner Emails helps you protect your inbox by providing virtual email addresses that forward all incoming emails to your personal account.
Users in 35+ countries trust Shuffle to connect with alternative phone numbers to protect their privacy. Business or personal, we've got your number. Use it for Dating/Meetups (Tinder, Grindr, Match, POF, Meetup), Marketplaces (Craigslist, Etsy...
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Hushed is the best private phone number app for any occasion! When you need a different number to call and text with, Hushed lets you get local numbers from over 60+ countries. You can use Hushed for private calls and texts. You can even manage multiple lines for your personal or business life