Rolls d4 to d100 with modifiers and keep-highest or keep-lowest rules, all from a seeded generator you can pin to a single repeated face.
Each face comes from a seeded mulberry32, so a seed reproduces a roll exactly.
How it works: a face is 1 + floor(random x sides); keeping only the highest or lowest is applied after the roll, and the modifier lands on the total rather than on each die.

Fit widths and heights at any ratio.

Compound interest and repayment schedules, charted.

Body mass index with healthy-range context.

Semester GPA from your grades and credit units.

Drag the two control points on a curve, watch the easing play and copy the cubic-bezier CSS.

Millisecond stopwatch with lap splits, fastest lap and keyboard start/stop.

Open Graph and Twitter cards with a live link preview and character counts.

Strip repeated lines, keep first or last, case-fold, trim and sort the result.