wwriteLite is a plain-text application that allows you to create and save files from templates. wwriteLite is available supports iPhone, iPod Touch, and iPad.
wwriteLite is full of features like templating, emailing, archiving, importing, and exporting files.
wwriteLite does not keep your files on any servers, all of the files are local-only. If you want you can lock the files which will require either Face ID or Touch ID to unlock, which will prevent someone from being able to read your files.
wwriteLite requires iOS 12.2, it is free, but ad-based. The ads are first-party, meaning they do not rely on any other party to deliver the ads.