Zero-knowledge habit tracking. Your growth belongs to you.

Hi Product Hunt! 👋

I'm Mark, solo dev and co-founder of Moss Piglet — a privacy-first public benefit company.

Habit tracking is personal. Your goals, your struggles, your progress — that's some of the most intimate data you can generate about yourself. So why does every habit tracker out there store it in plaintext on their servers?

Metamorphic is a zero-knowledge encrypted habit tracker. Your data is encrypted in your browser before it ever leaves your device. The server never sees your habits, your goals, or your progress. Not even we can read it.

How it works:

• Password-derived public-key cryptography runs entirely in the browser

• End-to-end encryption by default on every plan — not a premium add-on

• The server stores only encrypted blobs it can never decrypt

What you get:

• Habits & streaks — build consistency and track your check-ins

• Reflections — journal on your progress privately

• Goals & milestones — set targets and track meaningful progress

• Schedule / calendar — plan your habits around your life

• Progress insights — see how you're actually doing over time

• Family groups — up to 6 people with shared habits, shared goals, and a group dashboard

• Data export — your data, your way out. Always.

Every plan gets E2E encryption. The free tier gives you 5 habits with 7 days of history and full streak tracking — no credit card, no catch. Paid plans unlock unlimited habits, full history, reflections, goals, insights, and family features.

Why I built this:

I believe privacy is foundational to how we grow as people. You can't reflect honestly or push yourself if you know someone's watching. Metamorphic is built to give you that space.

It's built with Elixir and Phoenix LiveView, bootstrapped with zero investors, and run as a public benefit company — so the incentive is always the product, never your data.

I also built MOSSLET, a privacy-first social network with E2EE messaging and Bluesky interop, using the same encryption architecture that inspired Metamorphic.

Launch offer: Use code PH20SAVE for 20% off 6 months (good until April 30, 2026 at 11:59pm).

Would love to hear what you think — happy to answer any questions about the zero-knowledge architecture or anything else. 🙏