Two people, one laptop, one nickname, and a running argument about who gets to type the next line. Couples chat is its own thing: not one partner sneaking off with a phone, but both of you in the room at once, flirting with a stranger together and watching each other's face while it happens. LewdChat is free and anonymous with no accounts, which makes it about the lowest-stakes way a couple can play with a third. Nobody is coming over, nobody sees either of you, and either of you can close the tab.
The three ways couples actually use the room
The first is together, as a unit, both typing. You share a nickname, you take turns, you talk about the replies out loud in the room you're sitting in. This is the most common and the most fun, because half the entertainment is not on screen.
The second is one typing and one watching over their shoulder, which usually means one of you is more comfortable being explicit with a stranger and the other likes the view. That's a perfectly stable arrangement as long as the watcher genuinely wanted to watch.
The third is narrating for each other. The stranger is a prompt rather than a partner. They describe something, you two react to it, and what's actually happening is between the pair of you. Plenty of couples do this and never once go into a private window with anyone.
Say you're two, early
Announce it in the main room or in the first line of a private message. "We're a couple, both here" costs you nothing and saves everyone a bad surprise. Some people specifically want to talk to a couple. Some people don't, and would rather find that out now than forty minutes in when one of you says "we both think" for the first time.
Pretending to be one person and revealing it later goes badly every time. It reads as a setup, and the stranger who feels tricked will leave mid-sentence. The room has no shortage of people who are into the idea, so there's no advantage in hiding it.
Decide before you start whether you're a shared nickname or two separate ones. Two nicknames is clearer for anyone talking to you, but it also means either of you can drift into a private conversation of your own, which is a different arrangement and one you should have agreed to on purpose rather than by accident.
Agree the limits before you open the tab
Ten minutes of talking first prevents the entire class of problems that ruin this. The questions are unglamorous and worth answering out loud. Are private windows allowed, or does everything happen where both of you can see it? Does one of you get talked to more, and is that the point or a problem? Are there specific things that are off the table? Is anyone allowed back tomorrow without the other one there?
Also agree how you stop. A single word or a hand on the arm, and the tab closes with no explanation owed to the stranger and no debrief demanded of your partner in that moment. Having an exit that doesn't require a discussion is what makes people willing to try it in the first place. If you're used to negotiating scenes, this is the same instinct applied to something much smaller, and the negotiation page covers the general shape.
Jealousy shows up, and it isn't a verdict
One of you will feel something at some point. Usually it's the moment the stranger writes something to your partner that's genuinely good, and there's a lurch. That's normal and it doesn't mean the evening was a mistake or that your relationship has a problem.
What matters is what you do in the next thirty seconds. Say it. Not afterwards, not in the car the next day. "That one got me, hang on" stops everything instantly and costs nothing. The couples who do this repeatedly and enjoy it are not the ones who never feel it, they're the ones who say it early and keep going or stop, deliberately, either way. The couples who end up in a fight are the ones who sat on it for an hour to avoid spoiling the mood.
Where this sits next to swinging and poly
It's adjacent to both and identical to neither. Swinger chat is the lifestyle room, with its own vocabulary and a real-world meeting somewhere on the horizon for a lot of the people in it. Poly chat is about relationship structures, people who have more than one partner as an ongoing fact of their life. Couples chat is neither. Nobody's opening a marriage and nobody's meeting anybody.
If the fantasy has a specific shape you already know the name of, the room has pages for those: hotwife, stag and vixen, threesome chat for the scene itself. A lot of couples use text as the safe version of a thing they're curious about and have no intention of doing, which is a completely legitimate reason to be here and the one most people are here for.
One hard rule, and the practicalities
Share what's yours to share. Your partner's photos are theirs, not yours, and posting them without explicit consent is ban-worthy, including if you're married, including if they're in the room with you and you assumed. If they're sitting next to you, ask out loud. The rules are enforced by actual moderators.
Beyond that it's straightforward. No accounts, nothing installed, nothing tied to an email, so there's no profile of the two of you accumulating anywhere. If you're doing this from different places, long distance sexting is the version where the couple is the pair in the private window. Free, anonymous, adults only. Pick a nickname together and see who's about.