Thanks for your response.Strongbox either now has- or will have extensions for other browsers. macOS version has those extensions now. iOS either now, too, or coming soon.
[I like Strongbox. I don't yet use Strongbox. I'm looking to switch--soon--from 1Password v7.]
Strongbox appeals to me for two reasons: (a) KeePass file format (kdbx) works with several apps in addition to Strongbox. (b) KeePass has a critical mass and Strongbox is on the rise.
Lots and lots of people are buying- and using Strongbox. I think it'll be around for a while and I think the developer will put good effort in to development. In my opinion: Codebook is obscure--fewer users? slower growth?--so if you're looking for it to gain features, well that's not a sure thing. I want my password manager to be an app that very many other people use. I want my password-database file format to be one that more than one app uses.
[N.B. These priorities of mine come directly from the 1Password change to sub-only pricing. I've got a lot of data in 1Password and it feels as if I'm being held hostage. Maybe some apps are flashier than is Strongbox/KeePass but after this 1Password debacle I want to always have options when it comes to apps managing my data.]
It's my opinion that all current apps have one shortcoming or another. For instance macOS autofill apps (e.g., Strongbox, Minimalist) are limited by Apple constraints (e.g., no creating a new password-manager item by right-clicking in a password field?)... 1Password v7 is great but it's no longer buyable... 1Password v8 takes away features such as smartfolders... Secrets has good featureset and it's not tied to macOS autofill but still it, too, has no functionality for creating database items on the fly... I've looked at Codebook but I've not ever used the app; it's my understanding that Codebook does not allow for creating smartfolders (saved searches based on multiple criteria), which for me, is a dealbreaker... In summary: They're all bad, but in different ways.
I don’t know what your reference is for “KeePass has a critical mass and Strongbox is on the rise.” Additionally, it seems like you should be considering Bitwarden if want an app that a lot of people use.
Codebook is indeed obscure, but the developer has been around a long time, and they seem to have a solid business. As they supply regular updates, and provide good support, I am not worried that they are going to go away anytime soon. Furthermore, I am not looking for new features, as I just using Codebook as a password manager.
My number one concern with a password manager is how secure it is. Codebook allows you to keep your vault on just your local hard drive, instead of it floating out on the Internet where hackers could conceivably get access to it. Additionally, the program can operate with a minimum of plug-ins and extensions, which I also think helps keep it secure. That it is available for a nominal one-time cost is also a big plus.
Finally, I don’t get why complex searches are needed in a password manager, as I only have a few dozen passwords, and can always easily find what I am looking for.
Please let us know how it goes with Strongbox if you decide to start using it.