Informal:
* Tu vois? (Literally: "You see?") - This is the most common and informal way to say it.
* Tu comprends? (Literally: "You understand?") - This is another informal way to say it, emphasizing understanding.
* T'sais? (Literally: "You know?") - This is a very casual and slangy way to say it.
* C'est ça! (Literally: "That's it!") - This is a way of saying "Exactly!" or "You got it!"
* Capiche? (From Italian "Capisci?") - This is a slangy way to say it, similar to "Got it?" in English.
Formal:
* Vous comprenez? (Literally: "You understand?") - This is the formal version of "Tu comprends?"
* Vous voyez ce que je veux dire? (Literally: "You see what I want to say?") - This is a more formal and literal translation of "You know what I mean?".
* Vous suivez? (Literally: "You follow?") - This is a formal way of saying "Are you with me?".
Other options:
* Tu sais ce que je veux dire? (Literally: "You know what I want to say?")
* C'est clair? (Literally: "Is it clear?")
The best way to choose which phrase to use depends on your relationship with the person you are speaking to and the situation.