Edit: Opps. I should have googled it first. Sorry. Someone already made a grammar and spelling checker. Here is the link

Original Message: If someone is a programmer, I have a really good idea for you. How about an app/website that checks Esperanto grammar.

For example, I always make mistakes with the accusative. The app could check to see if two nouns are present in a sentence. If the sentence doesn't not have a comparative like "estas" then one of the nouns should take the N ending.

Maybe, I will do it myself if I feel ambitious one day.

The one I use is Lingvohelpilo

Alkanadi:Original Message: If someone is a programmer, I have a really good idea for you. How about an app/website that checks Esperanto grammar.

You can try Lingvoilo (=LanguageTool): a multi-lingual and free (LGPL) grammar+spelling checker.

https://languagetool.org/eo/

It works on the web, and there are also plugins for LibreOffice, Firefox, Vim etc:

I maintain the Esperanto version, so feedback to improve it is welcome.