New Web App 'fog mail' Released: Send Messages by Writing on Fogged Windows – A 10-Minute Ephemeral Experience Unlike LINE
Ciraf Inc. has launched "fog mail," a new web application that recreates the experience of writing messages on a fogged window with a finger. Messages disappear automatically after 10 minutes, offering a unique ephemeral communication experience accessible directly through a smartphone browser without installation.
📋 Article Processing Timeline
- 📰 Published: April 28, 2026 at 14:50
- 🔍 Collected: April 28, 2026 at 08:01
- 🤖 AI Analyzed: April 28, 2026 at 08:33 (31 min after Collected)
## What is fog mail?
"fog mail" is a new web application that allows users to send messages by blowing breath onto a fogged window and writing with their finger, all within their smartphone browser.
Users can press a "Haaaa" button to fog up the screen, and then trace with their finger to clear the mist and reveal text. Once finished, a unique URL can be sent via email or LINE. When the recipient opens the URL, the same message is reproduced on the same type of fogged window on their device. The message automatically disappears after 10 minutes.
No installation is required. It can be experienced solely through a browser.
URL: https://ciraf.jp/fogmail/ (Smartphone exclusive)
## Screen Image
## Background of Development
The starting point was the idea of recreating the experience everyone has had at least once: blowing breath onto a train window and writing words on the fogged surface – but on the web.
The concept behind this service is the constraint of "disappearing" messages, which LINE and email lack, and the "symmetry" where "the receiver also shares the same experience." By saving the sender's tracing data on the server and redrawing it exactly on the receiver's screen, the same message appears on the same window, regardless of the device.
## Main Features
- Screen fogs up with a "Haaaa" button (pressing multiple times increases the density of the fog)
- Trace with a finger to clear the mist and write messages
- Send a unique URL via email or LINE
- The message is reproduced when the recipient opens the URL
- Messages automatically disappear after 10 minutes
## Technical Overview
- Supported Environments: Smartphones (iOS Safari / Android Chrome)
## Technology Stack
- Next.js
- Supabase
- Canvas API
- Development Support: Claude Code (Anthropic)
## Usage Fee
- Free
## Development details published on note
The entire development process of fog mail, including its planning background, technical implementation, and development challenges, is detailed in a note article.
If you are interested in personal development using Claude Code, please take a look.
👉 https://note.com/ciraf_inc/n/n34cd1e2ff2c7
## Company Profile
Company Name: Ciraf Inc.
Location: Tokyo
Representative: Hironori Onoe
Business Activities: Web, video, and branding production
URL: https://ciraf.jp/
Note: https://note.com/ciraf_inc
## Contact for this matter
Ciraf Inc.
Email: onoe@ciraf.jp
URL: https://ciraf.jp/contact/
* fog mail is an original web content operated by Ciraf Inc.
* This service is for smartphones only. If accessed from a PC, guidance for smartphone use will be displayed.
"fog mail" is a new web application that allows users to send messages by blowing breath onto a fogged window and writing with their finger, all within their smartphone browser.
Users can press a "Haaaa" button to fog up the screen, and then trace with their finger to clear the mist and reveal text. Once finished, a unique URL can be sent via email or LINE. When the recipient opens the URL, the same message is reproduced on the same type of fogged window on their device. The message automatically disappears after 10 minutes.
No installation is required. It can be experienced solely through a browser.
URL: https://ciraf.jp/fogmail/ (Smartphone exclusive)
## Screen Image
## Background of Development
The starting point was the idea of recreating the experience everyone has had at least once: blowing breath onto a train window and writing words on the fogged surface – but on the web.
The concept behind this service is the constraint of "disappearing" messages, which LINE and email lack, and the "symmetry" where "the receiver also shares the same experience." By saving the sender's tracing data on the server and redrawing it exactly on the receiver's screen, the same message appears on the same window, regardless of the device.
## Main Features
- Screen fogs up with a "Haaaa" button (pressing multiple times increases the density of the fog)
- Trace with a finger to clear the mist and write messages
- Send a unique URL via email or LINE
- The message is reproduced when the recipient opens the URL
- Messages automatically disappear after 10 minutes
## Technical Overview
- Supported Environments: Smartphones (iOS Safari / Android Chrome)
## Technology Stack
- Next.js
- Supabase
- Canvas API
- Development Support: Claude Code (Anthropic)
## Usage Fee
- Free
## Development details published on note
The entire development process of fog mail, including its planning background, technical implementation, and development challenges, is detailed in a note article.
If you are interested in personal development using Claude Code, please take a look.
👉 https://note.com/ciraf_inc/n/n34cd1e2ff2c7
## Company Profile
Company Name: Ciraf Inc.
Location: Tokyo
Representative: Hironori Onoe
Business Activities: Web, video, and branding production
URL: https://ciraf.jp/
Note: https://note.com/ciraf_inc
## Contact for this matter
Ciraf Inc.
Email: onoe@ciraf.jp
URL: https://ciraf.jp/contact/
* fog mail is an original web content operated by Ciraf Inc.
* This service is for smartphones only. If accessed from a PC, guidance for smartphone use will be displayed.