The toolbox.
Fourteen tools that earn their drawer space.

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

Decode the tiny numbers on chip resistors, from 472 and 4702 to 01C and 4R7, with the full EIA-96 table. Works backwards too.

Type the code printed on a ceramic or film cap, get pF, nF and µF with the tolerance range. Works backwards too.

Enter any three of R1, R2, C and frequency, solve for the fourth. Period, high/low time, and duty cycle.

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, 1 to 50 at a time. One-click copy.

Open a CSV, preview rows, search and pick columns, export the slice you actually wanted as CSV or Excel.

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.

A wordmark, a geometric shape, a couple of rules — out comes an SVG. Good enough to hold the space until branding gets serious.

Track projects, bugs, features, tasks, and notes. Saved to a JSON file or browser storage.

Set dimensions, choose square or rounded corners, copy the OpenSCAD code or render an STL on the server.