One Envelope: Typed Letters
%ED%85%8C%EC%98%A4%EC%8A%A4%ED%8A%9C%EB%94%94%EC%98%A4 Communication Contains ads
Type a letter on a typewriter, seal it, and send it as a private link.
- Downloads
- 9+
- on Google Play
- Price
- Free
- No in-app purchases
- Updated
- Oct 15
- 2026 · v1.0.6
Screenshots
About One Envelope: Typed Letters
Lighter than a handwritten letter, more thoughtful than a quick message.
Type your words on a mechanical typewriter, add a stamp, and seal the envelope. Send it as a link, and the recipient opens it like tearing open an envelope. If they have the app, it stays in their inbox. You can also set an opening day, so it opens on a birthday or a holiday morning.
Links work anywhere in the world. Only the first device that opens a link can open it again, and you can recall a letter at any time.
When you'd like it on paper, we can print it and send it by post. Physical letters can only be sent to addresses in Korea. Don't know their address? The recipient can write it from the letter link. We hand the letter to Korea Post within 2 business days once the address is in, and delivery time depends on the post office.
- Type on a typewriter with Korean and English keyboards
- Key sounds, a return lever, and a bell at the end of the line
- Decorative stamps inspired by Korean folk art
- Send a link right away, or keep it sealed until a date you choose
- Received letters are kept in your app inbox
- When you reply, the recipient's name is filled in for you
- Mail a real paper letter, even without their address
- Physical letters to addresses in Korea by standard or tracked mail
Made by Teo Studio (Taeyoung Park)
Contact: [email protected]
Type your words on a mechanical typewriter, add a stamp, and seal the envelope. Send it as a link, and the recipient opens it like tearing open an envelope. If they have the app, it stays in their inbox. You can also set an opening day, so it opens on a birthday or a holiday morning.
Links work anywhere in the world. Only the first device that opens a link can open it again, and you can recall a letter at any time.
When you'd like it on paper, we can print it and send it by post. Physical letters can only be sent to addresses in Korea. Don't know their address? The recipient can write it from the letter link. We hand the letter to Korea Post within 2 business days once the address is in, and delivery time depends on the post office.
- Type on a typewriter with Korean and English keyboards
- Key sounds, a return lever, and a bell at the end of the line
- Decorative stamps inspired by Korean folk art
- Send a link right away, or keep it sealed until a date you choose
- Received letters are kept in your app inbox
- When you reply, the recipient's name is filled in for you
- Mail a real paper letter, even without their address
- Physical letters to addresses in Korea by standard or tracked mail
Made by Teo Studio (Taeyoung Park)
Contact: [email protected]
What’s new
Version 1.0.6 · Updated October 15, 2026
You can mail a paper copy even if you don’t know the address yet. We’ll ask the recipient from the letter link, then print and send it. After you send — or when they open it — you can still choose to leave it on paper.