000 — Planning the MVP

Date: 2026-09-09

Prompt

Build a simplified planning app like the old Reddit /r/steroids plotter. Notes from a conversation:

• Peaks and troughs and plotting for steroids
• Different compounds have different esters
• Half-lives
• For GLPs and steroids

Also log the prompting journey in the repo so a friend can learn how to make a similar web app.

Target: a simple Next.js SPA on Vercel, same shape as early PedsCalc — one shared form, routes that load different compounds. localStorage now, maybe a later ad-free cloud save. Stack: Next.js + Tailwind + shadcn. Keep it lean. Plan first.

What we decided

• The old tool people remember is steroidplot → steroidcalc → steroidplotter.com. We rebuild the classic model, not the commercial Tmax/Cmax/ng-dL suite.
• Copy early PedsCalc architecture (shared form + catalog + /[slug] routes), not current PedsCalc (Clerk/Stripe/Mongo).
• Y-axis is estimated remaining active milligrams after ester weight. Not fake blood units.
• v1 catalog is eight compounds: four testosterone esters, NPP vs deca, semaglutide, tirzepatide.
• Recharts is the one extra library because a plotter without a chart is a form.
• Persistence is localStorage plus a shareable ?p= query string.
• Journey markdown is a first-class route, not leftover notes.
• GitHub repo starts private.

What we shipped

This planning note. Implementation is the next entry.

What we skipped

Auth, ads, orals, Sustanon, tren, vial math, compare-two-protocols mode, and any backend.