Spoiler-safe by default
Future comments stay hidden until you reach the same point in the video, episode, live event, or book.
Public Documentation
Everything you need to use Comento.
Comento is an async group chat for shows, sports, videos, podcasts, books, and live events. You create a room, comment at specific moments, and everyone else sees those comments only when they reach the same point. That keeps the conversation aligned without forcing everyone to watch live.
Overview
What Comento is
Comento is not a livestream player and not a normal group chat. It is a shared room where comments are attached to moments in a timeline, so people can react together without being present at the same time.
Built for async groups
Your friends can join now, later tonight, or next week and still follow the same shared conversation.
Works across formats
Create rooms manually or from supported YouTube, podcast, and book flows, then invite people with a code or link.
Getting Started
Quick start
Sign in
Open Comento and sign in with Google. Your account profile is created automatically the first time you enter.
Create or join a room
Create a new room for the thing you are watching, listening to, or reading, or join an existing room with a 6-character code or invite link.
Start at the shared sync point
When you tap the watch button, Comento starts your personal timeline from the room’s sync moment, like the start of a video or page 1 of a book.
Comment as you go
Each comment is saved at your current point in the timeline. Other people see it when they reach that same point.
Rooms
How to create a room
Comento supports several room types so you can start fast without manually typing every detail.
Manual
General event room
Create a room with your own title, subtitle, and sync moment for anything that does not fit a built-in source.
- Good for sports, premieres, award shows, concerts, and one-off events.
- You choose the room name, subtitle, and sync point.
YouTube
Paste a YouTube watch link
Comento fills in the room details automatically and sets the sync moment to the start of the video.
- Uses the linked YouTube video URL.
- Pulls in title and channel details when possible.
Podcast
Paste Spotify or Apple Podcasts links
Comento fetches episode metadata and starts everyone from the beginning of the episode.
- Best for episode-by-episode reaction threads.
- Artwork and publisher info are filled automatically when available.
Book
Search for a book or enter it manually
Book rooms use page progress instead of play time, so readers can react without spoilers.
- Search by title, author, or ISBN.
- If a book is not found, you can enter the title, author, and page count yourself.
Membership stays simple
Rooms are shared with invite links or 6-character room codes. People join the room first, then take part in the conversation as members.
Core Behavior
How sync works
Comento tracks where each person is relative to the shared starting point. Messages unlock when your own progress reaches the point where that comment was originally posted.
For video, podcasts, and events
Comments are attached to elapsed time from the room’s sync moment. If someone posted at 14:32, you see that comment when your own timeline reaches 14:32.
For books
Comento uses reading progress instead of a playback timer, so discussion can follow page-based milestones.
Why spoilers stay hidden
Future comments do not unlock early. You only see what matches your current place in the room, not everything that has already been posted by other people.
Using The Room
What you can do inside a room
Post comments
Send text reactions at the exact moment you are watching or reading.
Add emoji reactions
React to individual comments without adding a full reply. Reaction digests can also be emailed if enabled.
Adjust your sync
If you started a little early or late, use the sync adjustment controls to shift your own place forward or backward.
View members
Rooms track who is in them, so shared spaces stay member-based instead of becoming open comment threads.
Invite more people
Members can keep the room growing by sharing the room code or invite link with the rest of the group.
Leave or delete
Members can leave rooms. Owners can remove the room entirely.
Supported Content
What kinds of content Comento supports
- Shows, live events, sports, and anything else you want to label manually.
- YouTube watch links.
- Podcast episode links from Spotify and Apple Podcasts.
- Books, either found through search or entered manually.
Important
Comento organizes the conversation. It does not host the media itself. People still watch, listen, or read through the original source.
Account
Notifications and settings
Open the Account panel from the app to manage your profile and email preferences.
Email notifications
Get emails when new room activity happens in rooms you joined.
Reaction emails
Receive digest emails when people react to your comments.
Newsletter
Choose whether to receive product announcements and updates by email.
- Your name, email, and photo come from your sign-in account.
- Notification settings are stored on your Comento profile.
- You can sign out at any time from the same Account panel.
Help
FAQ and troubleshooting
I opened a room link and cannot get in.
Make sure you are signed in, then try the latest invite link or 6-character room code from the room owner.
I am worried about spoilers.
That is the main reason Comento exists. Future comments stay hidden until your own progress reaches their timestamp or page position.
Can I use Comento without watching live?
Yes. Async use is the default. Everyone can show up on their own schedule and still experience the conversation in order.
My YouTube or podcast details did not auto-fill.
Check that you pasted a supported URL. For YouTube, use a standard watch link. For podcasts, use Spotify or Apple Podcasts links.
Can I use it for books?
Yes. Book rooms are built in. Search for the book first, or enter the title and page count manually if needed.
Still need help?
Email info@comento.co or return to the app.