Straight answers about Saibre: it is fully local with a published domain allowlist, there is no Saibre server in the content path, it protects the whole machine rather than one browser tab, it blocks known and obfuscated injection and jailbreak attacks, certificate-pinned apps are blocked rather than leaked, Linux is in beta via pip, and billing is self-serve with a 14-day money-back guarantee.
Saibre requires JavaScript for the interactive site. Every page is listed below.