# I built an AI for relationships — here's why nobody else has > Source: > Published: 2026-06-12 09:31:24+00:00 Every developer I know has built something for themselves. A productivity tool. A habit tracker. A personal finance app. An AI that makes *them* smarter, faster, calmer. I did the same thing for 2 years. Then I had a conversation with someone close to me that I completely mishandled — and I realised no amount of personal productivity tools would have helped me there. The problem wasn't me, individually. The problem was the space *between* us. So I started asking a weird question Why has all of AI been built for individuals? Copilot helps *you* code faster. ChatGPT makes *you* smarter. Notion AI organises *your* thoughts. Calm helps *you* sleep better. Not one of them is built for what happens when two people try to understand each other. That's a massive gap. And it's one I couldn't stop thinking about. What I built Mendle — an AI-powered Relationship Intelligence platform. Not a therapy app. Not a chatbot companion. Not another journaling tool with an AI skin on top. The core idea is **shared emotional memory. Most relationship apps are built around one person's perspective. You log your feelings. You get insights. Your partner is an afterthought in the architecture. Mendle is different at the data model level. Both people contribute. Both people benefit. The AI builds an understanding of the relationship not just an individual. Over time it surfaces patterns. Communication loops. Emotional triggers. The things you keep missing because you're too close to them. The technical challenge that surprised me Building AI for two people is fundamentally harder than building it for one. Single-user AI: one context window, one set of preferences, one voice to understand. Relationship AI: two different communication styles, two different emotional vocabularies, shared history that neither person has complete visibility into, and privacy boundaries that have to be respected even between partners. The shared memory architecture was the hardest part to get right. How do you build something that feels collaborative without violating either person's sense of privacy? Still iterating on this. Would genuinely love input from anyone who has thought about multi-user AI contexts. Where it's at Mendle is live at mendleapp.com — early stage, free tier available, actively looking for feedback. If you've ever thought about the multi-user AI problem or built anything in the emotional/relationship tech space, I'd love to talk. Community → t.me/Mendlecommunity What's the most interesting unsolved problem you've seen in human-AI interaction? Especially curious about the multi-person context challenge.