Introducing Letter: the free text editor designed to be human.

No account, no sign-up. Your documents live on your device, and one switch adds them to iCloud Drive or OneDrive. Spelling and grammar are checked right on your computer, in German, English, French and Spanish.

Need to calculate something mid-sentence? Type “four to the power of two times three” and Letter writes it perfectly formatted, in real math notation: 4² × 3. It even works out the 48 as you go.

And when something is private, send it as a .letter file: double-encrypted with AES-256 and XChaCha20, signed by you, and marked with a moiré pattern that carries the recipient’s identity, so even a photo of the screen can be traced back to its source. Add a password, and nobody gets in without it.