The best alternatives to SudoApp are BillGuard - Android, Reddo, and MushRoom. If these 3 options don't work for you, we've listed a few more alternatives below.
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Knock Knock the person whom you want to message and he/she should accept your knock Room or Group can be created by providing a name Share Room link with your friends to join the conversation Watch video or listen music during conversation
Reachable let customers call & message businesses on the GO across different channels such as Facebook, Twitter, WhatsApp, Telegram, SMS, Email, Web, Viber, Neighborhood, Team-Chat, etc Removes Toxicity(insults, flirting, threat etc) across different channels