Corrections, bug reports, and quiet suggestions are welcome. There is no form here — please send a note to the address below and you will get a reply within a few days.
What helps
- If you found a number that converts incorrectly, include the input value and what you expected.
- If something looks wrong visually, your browser and device size make it much easier to reproduce.
- If you have a request for a new feature, a sentence about how you would use it is more useful than a long specification.