Yours Sincerely

Anonymous love letters written in disappearing ink.

Yours Sincerely is a free, open-source space for anonymous letters written in disappearing ink: anyone can publish a short letter without an account, and every letter fades from the public feed after 21 days.

Writers publish as "Anonymous" or under any name they pick. Readers can like and reply to letters. Each letter shows how much of its 21-day life is left, then disappears from the feed.

It is a public art project with optional anonymity — a direct channel to the inner lives of other people who, in other contexts, rarely reveal such vulnerability. Think of it as a magical graffiti wall in a busy part of town: notes to no one, tiny beautiful letters to each other, signed "Yours Sincerely, Anonymous".

Yours Sincerely runs on the web at https://yourssincerely.org and as native apps for iOS and Android. It is built and maintained by Kaiyu Hsu (https://kyh.io), and the source is open at https://github.com/kyh/yours-sincerely.

• About: what the project is and why it exists
• Contact: email and GitHub
• Privacy: what is collected and who processes it
• Terms: rules for using the service
• llms.txt: a guide to this site for agents