The best alternatives to Hiro & Shino are Party Parrots, Sticker Pricing, and Stickmoji. If these 3 options don't work for you, we've listed a few more alternatives below.
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Sticker Pricing is a cute little app for app creators, brands or business owners to communicate with users in messaging apps. Sticker packs can be created for iMessage, Telegram, Kik, Line, and other messaging apps, as well as custom keyboards for iOS and Android.