Contact

Have a question, found a bug, or want to suggest a tool? Send a message below and we'll reply to the email address you enter.

What to write about

• Bug or wrong result. Name the tool, what you entered, what you expected, and what you got. Your browser and device help too.
• Tool suggestion. Describe what it should do and when you would use it. Suggestions shape what gets built next; browse the full catalog first to see if it already exists.
• Question or feedback. Anything about how a tool works or how to use it.
• Privacy or terms. See the Privacy Policy and Terms of Use, then write if something is unclear.

Before you write

The FAQ answers the common questions about cost, privacy, offline use, and which tools need a server. To learn more about the site, read the About page.

What happens to your message

Your name (optional), email address, and message (up to 5,000 characters) are emailed to the site operator and used only to reply to you. They are not added to a mailing list or shared. There is no sign-up and no newsletter. This is a one-person project, so we aim to reply within 24 hours.