The best alternatives to Next Emoji Keyboard are Mumu, Fixmoji, and EmojiKey. If these 3 options don't work for you, we've listed a few more alternatives below.
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Emoji Go is the first Emoji Keyboard for Chrome to support Emoji v.13. Search, Copy&Paste and keep track of the last used emojis straight out of Chrome.
Emoji Key is a native iOS keyboard that lets you quickly sketch an emoji to find it. Along with sketching, by force touching on an emoji, the keyboard will present a list of similar emoji so you can find the exact emoji you want. Emoji on hunters๐