0-suite

Privacy-first browser tools. Every tool runs entirely client-side — nothing is uploaded, no API keys, no accounts, no tracking. Open DevTools → Network and watch: your data never leaves the page.

One integrated Astro app. Each hub is a route group with its own accent and theme, sharing a single semantic-token design system.

Hubs

Hub	Accent	What it does
dev0	blue	13 developer utilities — JWT decoder, regex tester, cron parser, base64, epoch converter, JSON→types, jq playground, ERD generator, UUID/ULID, cert inspector, JSON formatter, SHA hash, diff checker
web0	teal	6 network tools — DNS-over-HTTPS lookup, RDAP, HTTP header audit, WebSocket tester, email-header analyzer, CIDR calculator
data0	violet	7 data tools — DuckDB-WASM SQL workbench (CSV / Parquet / JSON) plus CSV⇄JSON, YAML⇄JSON, SQL formatter, Markdown-table generator, base converter and chart maker
privacy0	emerald	7 privacy tools — PII scrubber, file metadata stripper, encrypted local notes, browser-fingerprint check, password generator, file-hash checker, image steganography
ui0	amber	7 design & web tools — color picker (+ WCAG contrast), CSS gradient maker, meta / Open-Graph preview, favicon generator, QR code, URL encoder, lorem ipsum
media0	fuchsia	6 media tools — FFmpeg + Whisper in WebAssembly: transcribe, convert, trim, compress, GIF maker, extract audio
ai0	cyan	4 local-AI tools — LLM chat (WebGPU), PDF Q&A (local RAG), prompt playground, OCR

hub0 is the unified landing page that links them together — 50 tools across seven hubs, one real URL each.

Why client-side matters now: the safest way to use these alongside AI tools is to never hand your data to anyone's servers. Scrub it, decode it, query it — locally, in the tab.

Develop

Requires Node 18+.

npm install
npm run dev       # local dev server
npm run build     # static build to dist/
npm run preview   # serve the production build
npm run check     # astro check (type/diagnostics)
npm test          # vitest unit tests (media0/ai0 pure libs)

Architecture

Single Astro 5 app, output: 'static' (MPA) — every route ships its own CSS bundle, so per-hub themes never collide.

src/
  pages/
    index.astro        # hub0 landing
    <hub>/*.astro      # one route per tool (dev0/, web0/, data0/, privacy0/, ui0/, media0/, ai0/)
  hubs/
    <hub>/             # per-hub components, styles, lib

• Stack: Astro + Tailwind + TypeScript, all hubs (data0 included — it's Astro, not Vite).
• Theme: paper (light) / nocturne (dark) via data-theme, persisted to localStorage['0-theme'].
• Token contract: hubs use semantic CSS vars (--bg, --ink, --accent, …) — never raw colors. Accent is the only per-hub differentiator.
• Heavy deps run in-browser: DuckDB-WASM (data0), exifr + pdf-lib (privacy0 metadata), jq-web / quicktype-core / dagre (dev0), FFmpeg.wasm + Whisper via Transformers.js (media0), WebLLM + Transformers.js + pdf.js (ai0).
• Cross-origin isolation: /media0/* documents get COOP/COEP headers (vercel.json in prod, a dev-server middleware locally) so multithreaded FFmpeg.wasm can use SharedArrayBuffer; other hubs are untouched. Without isolation media0 falls back to single-thread FFmpeg.
• SEO: static URLs, unique titles + meta, SoftwareApplication JSON-LD, sitemap, robots.txt.

The canonical site URL is a placeholder in astro.config.mjs (site:) — set it once a domain is chosen.

Licensing scaffold

Everything is free. An optional offline license-verification path (ECDSA P-256, public-key-only, no network calls) is wired in so paid features can be added later without refactoring — it gates nothing today. See docs/MONETIZATION.md in the parent project for the design. No signing keys live in this repo.

License

MIT