Standard Notes is a phenomenal note taking app and one of the first to bring encryption in note taking. They take security very seriously and have multiple third party audits. With that said, the bad outweigh the good. I don't mean to be a pessimist here (SN is inspirational) but: 1. Their free plan is extremely lacking. You can't even try out many of their editors. 2. Their pro plan mostly only offers editors. I am…
Is the cryptography protocol documented anywhere? The link on your website under the end-to-end heading leads to the Privacy Policy, that only mentions "XChaCha20-Poly1305-IETF & Argon2" which is far from enough details, especially for a closed source app with no audits. From the names it sounds like you use libsodium, which is good, but it doesn't make rolling your own protocol safe.
I'll write up a doc on how encryption + syncing works though. And I have full plans to open source the security related parts of the app.