The site https://languagetool.org states that in the free version you can check 20 000 characters. The website https://languagetoolplus.com/ states: “2500 characters per check (instead of 1500)”
Tell me, how many characters can I check in the free version?
The limits are exactly what the sites say. The sites have different limits.
I’m using this API https://languagetool.org/api/v2/check
It is listed on the site https://languagetool.org, where the limit of 20 000 characters is specified