Currently there is no full time team who is working to develop new features and improve the service. But you can already contribute by making donations, and a first version is already online on F-Droid and Codeberg. The last 2 months have also been spent choosing the name and logo. You can read all about them on the comaps.app website and on mastodon : @CoMaps@floss.social
I use Gammalecte. It’s like LanguageTool but it’s Ukrainian and I recognise myself in it more because LanguageTool is a bit more limited in its fremium version. Grammalecte is just a few Chrome, Firefox/thunderbird or LibreOffice extensions. Simple is exclusively for spell checking and dictionaries.