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Hi HN, I'm Kai Wang, one of the creators of Yuanzai World.<p>We built a simulation engine (currently on iOS & Android) that allows the community to create and share text adventures populated by multiple LLM-based agents. Unlike standard chatbots, our focus is on community co-creation—users define the worldviews, and our agents (with persistent memory and social relationships) bring them to life.<p>The cool part:<p>We implemented a system we call "World-Line Divergence" (inspired by visual novels like Steins;Gate). Usually, AI RPGs feel random or infinite loop. We built a state machine that tracks "World Deviation." If players interact with NPCs in specific ways (e.g., convincing an artist to change their style), it triggers a graph switch, leading to a completely different generated ending, effectively breaking the original script.<p>Tech Stack:<p>- Backend: Python / Java with a custom AI orchestration framework (to handle agent concurrency).<p>- Models: Hybrid routing between Gemini, GPT, and DeepSeek (optimizing for cost/performance based on task).<p>- Vector DB: Milvus (for handling long-term agent memory).<p>We are currently live on App Store and Google Play. Since it's a mobile-first experience, the link leads to our landing page where you can see the demo flow.<p>Would love to hear your feedback on the "World-Line" concept: Does this state-machine approach solve the aimlessness of AI RPGs?
Are you coding more or less, managing people differently, or making decisions in new ways because of AI tools? Which tools (LLMs, copilots, internal agents, analytics, etc.) have meaningfully stuck, and which turned out to be hype? I’m especially interested in concrete changes to how you plan, review work, and support teams.
I’m a solo founder running a two-sided marketplace app on the typical Vercel free tier + Supabase stack. It’s live with low-traffic right now. My concern is the 'cliff' I keep reading about—where Vercel becomes prohibitively expensive at scale. For those who migrated to a $5 Hetzner/DigitalOcean VPS:<p>What was the specific metric that forced the move? (Bandwidth, Function execution time, Cost?)<p>How much 'DevOps' time do you actually spend maintaining the VPS vs. building product?<p>I want to avoid premature optimization, but also don't want to be locked into a platform that will bankrupt the project if it takes off.
I've been running my own email server for the past month (https://github.com/fenilsonani/email-server) and I'm curious what the actual barriers are for people.<p>From my conversations, I keep hearing:
- "Email is hard" (deliverability, spam, etc.)
- "I don't want to manage another server"
- "What if I lose my emails?"
- "Google/Microsoft just works"<p>But I'm also seeing people frustrated with:
- Rising costs ($12/user/month for Google Workspace)
- Privacy concerns
- Account suspension risk
- Vendor lock-in<p>For those of you still on Gmail/Outlook/etc. - what would it actually take for you to self-host?<p>Not trying to convince anyone, genuinely curious about the decision-making here.