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Free .htaccess and nginx config generator for redirects, HTTPS, SPA fallbacks, and caching — copy-ready snippets.

Estimate your daily water needs from body weight, activity level, climate, and exercise duration.

Convert HEX color codes to HSL and HSLA values with hue, saturation, lightness, and a live preview.

Calculate cosmological redshift from wavelengths or recession velocity. Convert z to velocity, Hubble distance, and scale factor. Free, browser-based astronomy tool.

Free YouTube transcript tool — get timestamped captions from a video URL, search the text, and download TXT, SRT, or VTT. No signup.

Build linear and radial CSS gradients with multiple color stops, live preview, and copy-ready code.

Generate SEO-friendly blog posts with title, meta description, and markdown content using your own AI API key.

Find the least common multiple (LCM) and GCD of two or more positive integers with prime-factor and step-by-step GCD methods.

Calculate ultimate and allowable soil bearing capacity using Terzaghi's equation for strip, square, and circular footings. Enter cohesion, friction angle φ, unit weight, depth, and footing width. Compare applied pressure to q_allow. Metric and imperial units. Free, browser-based.

Fit a linear regression line to (x, y) data — slope, intercept, equation, correlation r, R², and predictions with step-by-step work.

Best font websites for Instagram Reels, Shorts, TikTok, CapCut & Canva — free and premium providers with license notes.

Calculate sunrise, sunset, solar noon, and day length for any location and date. Enter latitude, longitude, and UTC offset. Free, browser-based astronomy tool.