Built Marvin because nothing else worked for my brain. Started as my own HUD on Claude, shipped when it stuck.

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Cody Blair  • Peerlist

If you've installed more than three productivity apps in the last year and you're still running everything in your head, Marvin was built for you.Most habit trackers wait for you to show up. They're glorified checkboxes with streaks. The 77% of users who quit by day 3 didn't fail. The tools did. They couldn't see when patterns broke, couldn't connect domains, couldn't surface anything useful from the data they collected.Marvin is an AI accountability dashboard that does the opposite. The AI watches your real data (habits, streaks, daily logs) and messages you first when patterns shift. Detects a 3-day skip and surfaces a lighter version. Reads 2 weeks of your history and tells you what's actually breaking. Weekly AI review every Sunday that synthesizes your week and gives you one thing to focus on.22 modules, all toggleable. Pick what matters: fitness, fasting, habits, sleep, food, journaling, meditation, supplements, daily priorities, focus timers, cold exposure, weekly review, and more. Arrange them in a grid. Talk to Marvin in chat to log anything, ask why something matters, get a science-backed answer.The differentiator is the AI doesn't wait. Most "AI productivity" apps are a chat window bolted to a tracker. Marvin's coach is proactive. It sees what you log (and what you don't) and reaches out when behavior shifts.Built solo. Stack: Next.js + Supabase + Claude (Anthropic API) + Stripe + Vercel. The whole architecture started as my actual personal HUD and got fleshed out into a product when other people kept describing the same problem.Pricing: $10/mo or $79/yr. 7-day free trial, no credit card. If it sticks, keep it. If it doesn't, tell me what broke and I'll fix it.<a target="_blank" rel="noopener noreferrer" class="break-all link-break text-gray-500 hover:underline" href="http://marvinapp.co">marvinapp.co</a>