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Title: Your Life in Weeks — a free tool that shows your entire life on one grid, inspired by Wait But Why Body: I built weeknumber.cc/life-in-weeks.html — a free interactive tool that visualizes your entire life in weeks. Enter your birth date and it shows: • How many weeks you've lived (colored dots) • How many weeks remain (based on life expectancy you choose) • What percentage of your life you've lived • Your current week highlighted in green It's completely free, no signup, no ads. Works on mobile. I also built a few other free tools on the same site: • "What week were you born?" calculator • Week number countdown (real-time) • Week comparison tool • 2026 printable week calendar Would love to hear what you think! Link: https://www.weeknumber.cc/life-in-weeks.html

Title: [OC] I built a "Life in Weeks" visualization — your entire life in one grid of dots Body: Source: weeknumber.cc/life-in-weeks.html Tool: Custom HTML/CSS/JS Each dot = 1 week of your life. Enter your birth date, and it calculates: - Weeks lived (blue dots) - Weeks remaining (gray dots) - Your current week (green dot) - Life percentage completed The idea is based on Tim Urban's Wait But Why article "Your Life in Weeks." I built this as a free interactive version. Also includes week number tools, countdown timer, and printable calendars. Feedback welcome!

Show HN: WeekNumber.cc — Free week number calculator with API, widget, and viral tools I built a free week number calculator site. Features: - Instant current week number - 18,000+ programmatic SEO pages across 15 languages - Free JSON API (no key, CORS enabled) - Embeddable widget for any website - Viral tools: Life in Weeks, Birth Week, Countdown, Comparison - Printable week calendars (2025-2027) - Chrome extension ready - ISO 8601 complete reference guide Tech: Pure HTML/CSS/JS, hosted on Cloudflare Pages (free tier), Cloudflare Functions for API. Built this as a side project. Would love feedback from the HN community!

Tagline: Free week number calculator with API, viral tools & 15 languages Description: WeekNumber.cc is a free online week number calculator that instantly tells you what week of the year it is. ✨ Features: • Instant current week number on homepage • 18,000+ pages across 15 languages (Chinese, English, Japanese, Korean, Spanish, French, German, Portuguese, Russian, Arabic, Hindi, Thai, Vietnamese, Indonesian, Turkish) • Free REST API (no key, CORS enabled) • Embeddable widget for websites • Viral tools: Life in Weeks visualization, Birth Week calculator, Countdown timer, Week Comparison tool • Printable week calendars • ISO 8601 complete guide • Chrome extension 🔧 Built with vanilla HTML/CSS/JS, hosted on Cloudflare Pages. 100% free, no ads. First comment: Hey PH! I built this because I kept Googling "what week is it" and wanted a simpler solution. The "Life in Weeks" tool was inspired by Tim Urban's Wait But Why article. Would love your feedback!

I built a free "Life in Weeks" tool — see your entire life on one grid of dots 🟦⬜🟩 Enter your birth date to see: • Weeks you've lived • Weeks you have left • Your current week highlighted Completely free, no signup → weeknumber.cc/life-in-weeks.html

我做了一个免费的人生周数可视化工具 🟦⬜🟩 输入你的出生日期，一张图看完你的一生： • 已经度过多少周 • 还剩多少周 • 当前处于人生哪个阶段 完全免费，无需注册 → weeknumber.cc/life-in-weeks.html 灵感来自 Wait But Why。还做了周数计算器、倒计时、对比工具等。

标题：我做了一个免费周数计算器，18000+页面，15种语言，免费API 网址：https://www.weeknumber.cc 功能： • 打开即显示今天是今年第几周 • 18,000+ 页面覆盖 2015-2035 年所有周数 • 15 种语言（中英日韩西法德葡俄阿印泰越土） • 免费的 JSON API（无需密钥，支持 CORS） • 可嵌入网站的小部件 • 人生周数可视化工具（一张图看完你的一生） • 周数倒计时、对比工具、可打印周历 • ISO 8601 完整指南 • Chrome 扩展 纯静态 HTML，部署在 Cloudflare Pages 上。完全免费，无广告。 欢迎大家试用和提建议！

Title: I Built a Free Week Number API (No Key Required) — Here's How I built a free REST API for week number calculations. No API key, CORS enabled, runs on Cloudflare's edge network. GET /api/week → Current week GET /api/week?date=2026-12-25 → Week for Christmas GET /api/week?year=2026&week=53 → Date range for Week 53 The entire site is 18,000+ static HTML pages generated programmatically across 15 languages. All hosted on Cloudflare Pages free tier. Tech stack: - Pure HTML/CSS/JS (no framework) - Cloudflare Pages + Functions for the API - Programmatic SEO with structured data (hreflang, BreadcrumbList, FAQ schema) - 10+ interactive tools Check it out: weeknumber.cc API docs: weeknumber.cc/api-explorer.html GitHub: (coming soon) Would love feedback from the dev community!