Seylo is a fast, calm place to chat. End-to-end encryption, messages that can disappear, and AI that runs on your own device - never on a server.
Free to use. No ads. Your conversations are not the product.
The things other apps treat as afterthoughts, Seylo treats as the point.
Direct messages are encrypted so only you and the person you're talking to can read them. Not us, not anyone.
Set any chat to delete its own messages - after an hour, a day, a week. What's said doesn't have to last forever.
Summarize what you missed or clean up your writing with AI that runs in your browser. Your messages never leave your device.
Give any conversation its own look - patterns and colors, tuned for light and dark, that both people see.
Write now, send later. Line up an announcement or a reminder for exactly the right moment.
Share a guest link and someone can message you right away - no sign-up needed to say hello.
“We moved our work chats to Seylo for the disappearing messages. It just feels calmer knowing things clear themselves out.”
“The catch-up summary is the feature I didn't know I needed. I open a busy group and know what I missed in one line.”
“I send guest links to clients who don't want another app. They just click and we're talking.”
Early feedback from people using Seylo.
Direct messages are end-to-end encrypted, so only you and the person you're talking to can read them. You can also set any chat to delete its messages automatically. Seylo can't read your encrypted conversations.
The summarize and writing features run a small AI model right inside your browser. Your messages are never sent to a server for AI - everything happens on your own device. It works on Chrome and Edge, including on Android.
No. Seylo is free to use, with no ads. Your conversations aren't sold or used to train anything - they're simply yours.
Yes. Share a guest link and they can join a chat with you straight away, no sign-up needed. They can create a full account later if they want to keep it.
When its timer runs out, it's deleted for everyone - from the chat and from Seylo's servers, along with any attached media. It doesn't linger anywhere.
Every other app sends your messages to a server to run AI. Seylo runs it inside your own browser, so your conversations stay on your device - and cost you nothing.
Try Seylo