The best alternatives to WhatsWOM are Referlist, CrewFire, and ReferralHero. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of WhatsWOM?
AssemblyAI— Speech-to-Text API with superhuman accuracy
Referlist is a simple way to increase sign-ups on your landing page for pre-product launches. Give your users early access to your product when they share it with their friends!
CrewFire is a brand ambassador platform that helps e-commerce brands drive more referrals, word-of-mouth, user-generated content, and engagement, by turning their customers into their army of brand ambassadors on social media (and beyond).
Enable sharing via email, via social media, or via copy-pasting a custom hyperlink of your choice – by equipping your WordPress website with a powerful sharing interface that promotes word of mouth.