Articles · Guides · Tutorials
In-depth articles on AI tools, NLP, data science, bio-signal analytics, and machine learning — written for developers and data enthusiasts.
Learn how to format, validate, and minify JSON the easy way. Understand JSON syntax rules, the most common JSON errors, and how to fix them in seconds with a free online formatter.
Learn what actually makes a password strong, how password entropy and crack time work, why length beats complexity, and how to check your password safely in your browser.
Learn how to calculate your 5 heart rate training zones using the Karvonen formula, what each zone is for, and how to train smarter for fat loss, endurance, and performance.
Learn how to calculate Body Mass Index in metric and imperial units, what the BMI categories mean, the limitations of BMI, and how to interpret your result sensibly.
Understand WCAG color contrast ratios, the difference between AA and AAA, the rules for normal vs large text, and how to test and fix contrast for accessible, readable design.
Learn how to visualise CSV data as line, bar, or area charts in your browser — pick your axes, handle quoted fields, and build a clean chart in seconds without Excel or code.
Understand what Base64 encoding is, how it works, when to use it, why it is not encryption, and how to encode or decode text and data safely in your browser.
Learn what readability scores measure, what a good Flesch Reading Ease score is, and seven practical edits that make your writing clearer and easier to read.
Learn which meta tags actually matter for SEO and social sharing — title, meta description, Open Graph, and Twitter cards — with ideal lengths and a free preview tool.
A practical Markdown cheat sheet: headings, bold, italics, links, images, lists, code blocks, tables, and blockquotes — with examples you can preview live in your browser.
Learn how 90-minute sleep cycles work, why waking between cycles feels easier, how many cycles you need, and how to find your ideal bedtime and wake time.
How many words fit on a page? See word-count estimates by font, spacing, and document type, plus how to count words, characters, and reading time accurately.