"What is the difference between in the end and at the end?"

[hima11000]

On time = at the planned time; neither late nor early

Peter wants the meeting to start exactly on time.

In time = with enough time to spare; before the last moment

He would have died if they hadn’t got him to the hospital in time

In the end = finally, after a long time

In the end, I got a visa for Russia

At the end = at the point where something stops

I think the film’s a bit weak at the end