What to write about
So your message gets to the right place.
- Books and ordersQuestions about the books, the PDF edition or a purchase. For refunds, see the refund policy; include your order email.
- ToolsFound a bug, got a wrong result, or have an idea for a new free tool? Tell me which tool and what you expected.
- CorrectionsSpotted an error in a news post or guide? Send the page link and the source, and I will correct it.
- Partnerships and sponsorshipsBrand collaborations, sponsored tools or press requests. Include your company, what you have in mind and your timeline.
- Your dataTo ask about or delete information you have shared with this site, see the privacy policy or email me.
Please don't send passwords, card numbers or other sensitive details by email.