The toolbox.
Ten calculators that earn their drawer space.

Pick band colors, get resistance, tolerance, and tempco. Reverse-lookup also works.

Enter any three values, solve for the fourth. Duty cycle, frequency, and component values.

Solve Vin, Vout, R1, R2 (and RL). Currents and power dissipation included.

Resistor for 1 to N LEDs in series. Power rating suggestion baked in.

Generate memorable passphrases with digits + symbols. One-click copy.

Drop a CSV, preview rows, filter columns, export the slice you actually wanted.

Load a CSV in your browser, then explore it as a searchable app with filters, sorting, and a record view.

Load a JSON file in your browser, edit it as a sortable, editable grid with one level of nested sub-tables, then download the result.

Enter any two of voltage, current, resistance, or power — get the other two.

Track projects, bugs, features, tasks, and notes. File-based or browser-based.