In the end
In the end is used mostly as an idiom that means "finally," "after a long time," or, "when everything is considered." It is often followed by a comma. Here are some sentences with this idiom:

   1. We worked hard, and in the end, we achieved our goal.
   2. In the end, what really matters in a friendship is trust.
   3. We all wanted to go to different places, in the end, we agreed to go to the beach.
   4. We waited for the bus for 2 hours, in the end, we caught a taxi.
   5. I complained about the pizza so, in the end, I didn’t have to pay for it.
   6. We waited for an hour and, in the end, we went without her.
 
At the end
At the end is used in the idiom "at the end of the day" which means something similar to in the end (= when everything is considered). However, at the end is most commonly used more literally, as a prepositional phrase followed by of, to refer to the end of a specific noun. This noun can be a physical object, a period of time, an event, a place, or something more abstract, such as one's patience. Here are some sentences with at the end + of:
   1. At the end of his life, he had no regrets.
   2. Put a period at the end of every sentence.
   3. I pay the phone bill at the end of each month.
   4. There is a brick building at the end of the driveway.
   5. The teacher set some homework at the end of the lesson.
   6. I’m going on holiday at the end of the week.

 

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