I find reading the text back in a different font often helps, particularly switching from mono-spaced to variable or vice-versa, though I'm not sure why. Perhaps I remember the shape of the words as correct because that is what I just typed, and when all the words have a different shape I'm forced to think about it differently. It is why I often immediately spot a typo without even really looking after hitting "add comment" here, or flip down to look at the preview of a stack exchange post. The effect seems less pronounced when both texts are in view the whole time as with some markdown editors I've tried, which is why I think an unconscious "it looks like what I saw as I typed so is correct" thought is a factor.
Some time ago I tried having my posts read back to me via TTS but found the low quality voices and mispronunciations of actually correct phrases irritating enough to run any productivity gain. I should try that again, as I get the impression from posts here & elsewhere that freely available TTS options have improved significantly in recent years.