Ferramentas online gratuitas

Calculate escape velocity from mass and radius or surface gravity. Presets for Earth, Moon, Mars, Jupiter, and more. Results in km/s and m/s. Free, browser-based.

Check DNS record propagation across global public resolvers. Compare answers from Google, Cloudflare, Quad9, and more.

Free backpack Tetris fitter — pack rectangular items into a grid inventory like extraction shooters. See fit results and a visual bag layout.

Convert CMYK print color values to on-screen RGB and HEX for web and digital design.

Estimate daily calories from BMR and activity level, with targets for weight loss, maintenance, or gain.

Search Linux, Windows CMD, PowerShell, Conda, and GitHub CLI (gh) commands with syntax, examples, and shell filters.

Free speedrun pace calculator — compare current segment times to gold splits and PB, see pace delta and time you need to save.

Add password protection and permission restrictions to PDF files entirely in your browser.

Create soft neumorphic UI shadows for raised, pressed, and flat surfaces with copy-ready CSS and Tailwind classes.

Calculate DNA primer melting temperature (Tm) — Wallace rule, salt-adjusted, and long-oligo formulas with adjustable Na⁺. Free, instant, browser-based.

Generate a full Tailwind CSS shade scale (50–950) from a base color with copy-ready v3 config and v4 @theme exports.

Calculate steel weight for round bar, rebar, square bar, flat bar, plate, and pipe. Enter dimensions and quantity — get total kg or lb, weight per meter, and volume. Carbon steel density 7850 kg/m³. Metric and imperial units. Free, browser-based.