Spelling with dyslexia is not an easy play:

1)  It is difficult for a person with dyslexia to break words into phonemes/discrete sounds.

2)  The more phonemes/discrete sounds a word possesses, the bigger the challenge of deconstructing a word correctly to its phonemes.

3)  It is more difficult for a person with dyslexia to deconstruct the “middle” phonemes of a word, rather than the first and last phonemes.

4)  It is difficult for a person with dyslexia to associate sounds to letters that make up the sound.

5)  People with dyslexia tend to reverse letters in words (e.g. “on” instead of “no”).

6)  People with dyslexia tend to confuse letters that are visually similar (e.g. “bad” instead of “dad”).

7) People with dyslexia tend to confuse letters that sound similar. (e.g. “sity” instead of “city”).

8 ) People with dyslexia do not have strong visual memory for spelling. For example they will not be able to distinguish from memory the correct spelling of the word of “meet” versus the word “meat”.

9) People with dyslexia have difficulty to gain meaning from text.

10) Regular spell checkers are not “optimized” to understand and correct the spelling of a dyslexic.

For a solution, look at Ghotit Real Writer and Reader specifically designed for those with Dyslexia and Dysgraphia.