Swiftener
Swiss-army toolkit of free web utilities — no login
What it does
Swiftener is a free suite of browser and server-side tools for media, data, office, and code—CSV/JSON converters, PDF tools, YouTube downloader, and more. No account required for most tools.
Free online tools for media, data, office, productivity, and code — browser and server suites plus reference libraries. No account required for most tools.
Built for students, freelancers, and anyone who needs a quick edit, convert, or calculate — open a suite below and use it in your tab. Most tools need no account. A real spreadsheet, plus charts, pivots, and Parquet export. Units, KaTeX, a hundred solvers — all offline in the browser. Invoices and day-to-day admin. Dispatch needs an account for mail. Learn Python, JavaScript, TypeScript, HTML, SQL, Ruby, PHP, Lua, Perl, R, Scheme, AssemblyScript, computer science, data structures, software engineering, DevOps, cron, HTTP, JWT, hashing, diffs, subnets, regex, SQLite, NumPy, SciPy, SymPy, matplotlib, pandas, seaborn, data visualization, pandas plotting, Plotly, Altair, Bokeh, WordCloud,…from swiftener.com
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Hello HN! I found that picking out plausible but diverse skin tones for my digital art and game development projects was kind of difficult, and I got curious about if there was a way to define a color space that made it easy. I've built a color picker and procedural generation algorithm based on the space as well as a bunch of other fun js features and demos throughout the page that use the equations. If you find it interesting, I have lots of explanations of how I built it and what properties the space has. The methodology might be a bit shaky, but hopefully the result is as helpful for…
Life & fun · Aug 2026 · toneyalexander.github.io
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