Downloaders
Paste a link to fetch and download — YouTube, Xiaohongshu, X and WeChat Channels supported.
YouTube Video Downloader Video
Paste a YouTube link to download MP4 video (multiple qualities) or extract M4A audio.
YouTube Subtitle Downloader Subtitles
Download subtitles in many languages, in SRT / TXT / VTT.
Xiaohongshu Video Downloader Xiaohongshu
Paste a Xiaohongshu note link to grab the watermark-free video.
X Video Downloader X / Twitter
Paste an X (formerly Twitter) post link and download its video.
Page Asset Downloader Page Assets
Enter a URL to parse every image, document and archive on the page — pick and download as one ZIP.
Channels Downloader Channels
Paste a WeChat Channels share link to grab the watermark-free video.
File Tools
Everyday PDF & image tools, 🔒 Everything runs locally in your browser — files never leave your device
File Toolbox FileTools
Compress, merge, split and convert PDFs; compress, convert, crop and watermark images — all in one place.
Temporary Drop Paste
Hand text and files between your devices: paste or pick a file here and open it on the other device. You pick the self-destruct time (1 minute to 3 hours), no sign-up.
Network & Telecom
Look up IPs, DNS and domains, test speed, identify phone numbers.
Network Toolbox Network Tools
Your IP info, DNS record lookup, domain WHOIS, subnet calculation and HTTP header inspection — one page.
Speed Test Speed Test
Measured from the nearest Cloudflare edge: download, upload, latency and jitter, plus your IP and carrier.
Phone Tools Phone
Smart global number lookup: with a country code it detects the country and number type; without one, pick a country. Chinese numbers include carrier and tail-pattern notes.
Japan Toolbox Japan Tools
Corporate Numberの検証、Full / Half WidthConvert、Postal Codeから住所、Katakana Converter、JIS 漢字水準チェック。
Dev Tools
Everyday small tools for site owners and developers — all run locally.
Dev Toolbox Dev Tools
Domain name ideas with availability checks, sitemap generation, encoding conversion and hashing — everyday tools for builders.
Keyboard Tester Keyboard
Test every key one by one — pressed keys change color. 12 layouts: Apple, US, Japanese, Chinese, Korean, UK, German/French/Spanish/Russian, Dvorak and Colemak.
Generators & Makers
Generate identities, random numbers, QR codes and charts; typeset WeChat posts.
Fake Identity Generator Fake Identity
Generate full fake identities by country — name, address, phone, email — for 67 countries. Generated locally, nothing stored; keep your real info private when trying services.
WeChat Typesetting WeChat MP
Typeset WeChat articles with a phone preview; copy and paste to publish.
Practice & Reading
A little every day, for the long run: daily Stoic practice, a blog, a keyword map for the AI era, and daily AI news.
Stoa · Daily Stoic Practice Stoa
Built on Seneca's five essays, one practice a day, Monday to Friday: time audit, no running away, renaming adversity, stepping back, master-servant check. Weekly and monthly reports included.
Keyword Atlas
18 个领域、450 个行业黑话与专业概念，每个词一句人话解释。说出这个词，AI 就懂一整套。
What Does Claude Know About You
组合注册、购买、Persona 验证、客户端与Remote-control activity，实时推演哪些信息会流到 Claude 那边。
Daily AI News AI News
The day's important AI developments, folded by date. Click through to the source; RSS available.
Fish · Personal Blog Fish
A minimal Unix-style personal blog: tech, life and thinking.
Games & Creations
Hands-on mechanical 3D simulations, a run-a-company-in-Japan game, and a clay character asset library.
72 · Clay Character Asset Library 72
Clay turnarounds, asset cards and generation prompts for 69 comment-section characters, plus a map of the clay world.
Mechanical 3D Simulation Machine
Interactive 3D simulations of the Inter-3 three-speed hub and the Wooden Ox — open them up, take them apart, shift gears.
I Actually Run This Game
Run a company in Japan: start with ¥5M and juggle operations, organization, compliance and residency over 36 months.