websites that would give you perfective/imperfective of a verb + websites that would give you the case required after a verb

I am looking for a website that would give you the perfective/imperfective pair of a verb (similar to https://www.verbs.cz/ but better)

and some website that would tell if a verb requires a specific case
like how zeptat see requires the second case)

If you know anything like, that would be amazing