Simon is about 90%-95% accurate and many users have written to us claiming it is near perfection.
Artificial intelligence technology has made huge advances but it is not perfect and not right for every situation.
The greatest determinate on accuracy is the quality of the recording. If your audio has a lot of background noise, your transcript's accuracy will suffer.
If there is little/no background noise, you use lapel mics, and one person speaks at a time: you will get better results.
See here for our guide to get accurate transcripts.
We encourage new users to use the free credit to try their file with our speech recognition system and make sure they are happy with the results first.