I too had often wondered about this when I did not go to reconciliation for a couple of years. I thought that would be great. But, although I get nervous about confession, I have returned to the sacrament this year and probably been more times since returning than I had before. I think reconciliation is wonderful, you can’t replace the human dialogue with a computer.
However, there are apps and websites which help you to prepare for confession through a thorough examination of conscience. I definitely feel these are worthwhile. I use Mea Culpa.
You can clear your examination of conscience after use so nothing is saved and also password protect it. From a security point of view, online confessions could have disastrous consequences. Imagine finding the information on Facebook or google one day?