Gratis online tools

Generate formatted lab notebook entries from your experiment details. Full entries, procedure logs, or formal experiment reports with objective, materials, procedure, observations, results, and conclusions. Copy and paste into your notebook. Free, browser-based.

Compute 2D and 3D vector operations — add, subtract, dot product, cross product, magnitude, unit vector, angle, and projection — with steps.

Convert raw scores to z-scores and back using z = (x − μ) ÷ σ, with percentile and step-by-step work.

Free crosshair designer — adjust gap, length, thickness, outline, and center dot. Live preview plus copyable CSS and settings codes.

Free running track distance calculator — start GPS tracking, see live distance and estimated steps. Private, in-browser.

Solve linear and quadratic equations step by step. Enter expressions like 2x + 3 = 7 or x^2 - 5x + 6 = 0.

Assess exoplanet habitability with habitable zone, equilibrium temperature, and Earth Similarity Index (ESI). Presets for Earth, Proxima b, and Kepler-186f. Free, browser-based.

Free BPM tap detector — tap along to a song to find its tempo in beats per minute. Instant, private, and works offline in your browser with no signup.

Analyze password strength with entropy estimates, crack-time projections, and improvement tips.

Calculate restaurant net profit, food and labor costs, prime cost ratio, and profit margins from sales and operating expenses.

Free PDF page organizer — rotate, reorder, and delete pages in your browser, then download the updated PDF. No signup.

Find the prime factorization of any integer, list all divisors, and see trial-division steps with copy-ready output.