Proton Pass is a free alternative to Dashlane with no password limits | Proton
proton.me
Unlike Dashlane’s restrictions on password storage, Proton Pass offers unlimited passwords and devices for free.

Title; Seems like they are giving out a free 1-year plan, as long as you claim the offer before October 31st.

Seems to be legit, as it’s coming from their own website. I am currently using their offered plans too, and it works.