We built ZenCalcs - practical and modern-looking calculators. Should we add AI or more calculators?

We were tired of the calculator graveyard online -- slow sites, intrusive ads, unnecessary complexity. We wanted something that just works, looks good, and respects your time. So, we built https://zencalcs.com Where we need your help: We’re at a crossroads and would love the community’s input on what direction to take next: 1. Expand the calculator library – add more niche/specialized tools (what would you use?) 2. Add AI-powered natural language input – imagine typing “If I save $400/month for 5 years at 6% interest, how much will I have?” and getting instant results with step-by-step explanations 3. Optional user accounts – save your calculation history and favorite tools (still no signup required for basic use) 4. Multi-step calculation workflows – chain calculators together (e.g., calculate gross profit → then ROI → then tax implications) 5. Something we haven’t thought of? Feedback we’re looking for: • Does the design/UX feel intuitive? • Any bugs or issues you encounter? • What would turn this from “nice to have” into a daily tool for you? • Which direction (above) excites you most?