Ratio, speed and torque multipliers, and centre distance for a spur gear pair.
Driver
Driven

Union, intersection, difference, symmetric difference and unique elements over two number lists, sorted ascending with a count for every result.

Solve the internal rate of return for any cash-flow table with Newton-Raphson and a bisection fallback.

Monthly payment plus a full amortisation table with principal, interest, extra payments and the running balance.

Turn system size, peak sun hours and installed cost into annual kWh and a lifetime saving against a rising grid price.

Pull the text layer out of any PDF.

Read text aloud with the voices on your device.

Record, trim and download clips locally.

Record or upload audio and change your voice with 12 DSP presets, then save a WAV.