Depend on your platform. MacOS/iOS/iPadOS come with a more than decent integrated password manager for free. It almost never fail to identify password field and work both for web site and compatible applications.
The paying part is when you want to sync key-chain between device and require an iCloud subscription which start at $0,99 and bundle other features.
While I would never trust a "free service" (fremium backed with pro account/bundling is still ok AFAIC), it's still hard to consider $4/month for a syncing service cheap. It's literally the price of a cheap VPS service!
PS: From another angle if security is really your priority maybe $4 is not expensive enough. Password manager don't protect you from an hostile OS vendor and on top of that you now have to trust another entity. High levels of security require a global approach and paying more for a Password manager might provide a false sense of security.