Grammarly
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$0.00
per item
This website allows you to create a free account to upload your work for an initial edit and review. The algorithms in the site detect word usage, punctuation, spelling and grammatical errors.
If you don't have a captive audience or want to save costs (and patience) on editors, this is a great way to send polished copy. Paid versions allow for more in-depth information and potential improvement suggestions.