The best alternatives to Humin are RelateIQ, 6degrees, and Interact. If these 3 options don't work for you, we've listed a few more alternatives below.
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Notion— Get over $6,000 worth of Notion + unlimited AI, for free
Sparkbook is a smart phonebook that sparks rich personal or business relationships. The app gives you a social check-up, focusing you on a few people at a time that you're losing touch with. Shuffle your favorites, send pre-written messages, and take notes.