Changelog

The classic orange % icon is back — the favicon and social-preview image now carry over from the previous site, in the top bar too.
Copy confirmations now pop up right next to the number you clicked instead of at the bottom of the screen.
Duplicated rows are visually grouped with their original — indented, tinted, and joined by a connector — and results in every row now align to the same right edge.
Added a share row above the footer: post any calculator page to Facebook, X, Reddit, LinkedIn, WhatsApp, Telegram or Threads, grab a QR code, or copy the link.
Simplified the precision control to just .0← / .00→; Reset returns to automatic decimals.
Article and explainer text now uses the full content width, and the homepage shows Articles and Changelog as their own full-width sections.

Rebuilt the entire site as prerendered static HTML — no rendering shell, instant first paint, full content visible to every crawler. (The previous vendor-built site is the implicit 1.x.)
New exact-decimal engine: results are computed as exact ratios and rounded once at display — no floating-point artifacts, ever. Method on the about page.
Two new modes: percentage difference and reverse percentage, joining the original five rows.
Shareable calculations: Copy link encodes your rows into the URL.
Spreadsheet-style precision: .0← / .00→ set 0–8 fixed decimals; auto mode shows exact results in full and rounds repeating ones.
Dark mode with a top-bar toggle; light remains the default.
New FAQ (15 questions), articles with DOI-cited research, this changelog, and a blog.
Dedicated pages for each intent: increase, decrease, change, difference, percent off, and reverse.
Every legacy URL 301-redirects to its successor in a single hop; legacy locale pages consolidate to the English site while proper localization is prepared.

2.0.1 — Launch-feedback polish