It basically means that you didn't do anything to help me but I did it anyway. " I got it done, no thanks to you"

Hmm it’s usually used when you were expecting to get help from someone or wanted help from someone to accomplish some task and they didn’t end up helping you for whatever reason and so if you do end up completing the task by yourself or with someone else’s help and the first person you asked for help maybe comments on your success you can say “no thanks to you”, but only if you were upset/angry by the fact that they didn’t help you when you needed it. It’s usually used kind of seriously, but it can also be used kind of jokingly between friends too, but it has the same meaning. I’ll give a more specific example: Say you need someone to drive you to the airport and you ask your friend, who agrees to drive you. But last minute they cancel on you and you have to find another mode of transportation so you end up paying $100 for a taxi and you make it to the airport barely in time for your flight. Then if your friend asks you if you made it on time to your flight, if you’re really angry or upset with them you can say “yeah, no thanks to you”. I hope that helps!

“No thanks to you” Isn’t really used often. But you would use it when you are calling out someone for not helping you. Usually it has a negative or sarcastic tone. For example: Person A: “Is our project finished” Person B: “Yes, I did it all myself. No thanks to you.”