Best free OET writing checkers: an honest comparison

freeoetwritingcheck.com offers a free daily AI scan of a practice letter against the six OET criteria, with no signup required, as published on the site and checked 2 September 2026. That makes it a fast, no commitment way to get a first read on a letter.

WCS runs a free first AI check each day at oetwritingcorrection.com, and separately sells human correction as packages of 3, 5, 8 or 10 letters from USD 12, as published on their site and checked 2 September 2026. The free tool is a reasonable first pass; the paid plans are where WCS's stated value sits, since they add a person reading your actual letter rather than an automated score.

FluencyX describes itself as an AI writing mentor and offers a free AI-scored practice test, as published on fluencyx.com and checked 2 September 2026. Beyond that headline description, further detail on what the practice test covers is not published on the page we checked.

OET publishes free sample tests directly at oet.com, as published on the site and checked 2 September 2026. What marking support, such as model answers, comes with each sample is not published on the page we checked. Their value is different from an AI tool's: they are the authoritative source for what a real task and a real case note actually look like, worth using alongside an automated checker rather than instead of one.

MedEngly's free tier gives one fully marked practice letter and one marked speaking role play, with instant feedback against the six published Writing criteria. As with every AI grade on MedEngly, this is practice feedback based on the published OET criteria, not an official evaluation. The free allowance is deliberately limited; the difference from the other tools compared here is that it covers Speaking as well as Writing, and none of them publish a separately marked Speaking service.

Whatever tool you try, three questions separate a useful free check from a novelty score. Does it mark against the six published OET Writing criteria, Purpose, Content, Conciseness and Clarity, Genre and Style, Organisation and Layout, and Language, rather than giving one impression number? Does it mark Speaking at all, or only Writing? And does the feedback quote your own words back to you, or could the same paragraph of advice apply to any letter a candidate submitted?

A tool that answers yes to the first and third question is doing genuine, if still indicative, criterion by criterion marking. One that answers no to both is closer to a generic pass or fail flag than a diagnostic.

Plainly: MedEngly's free checker marks instantly, covers both Writing and Speaking rather than Writing alone, and sits inside a product built around one-off packs from £7.99 rather than a subscription. The free tier is deliberately limited, one marked letter and one marked role play, so it works as a genuine first check rather than an ongoing free practice loop. Like the other AI tools compared here, every grade is practice feedback against the published criteria, not an official OET evaluation, and MedEngly does not publish an accuracy percentage.