I am a long time ProtonMail customer, but I admit to switching back to Gmail every few months, then a while later switching back. I mostly use Apple's Calendar.

I am a long time ProtonMail customer, but I admit to switching back to Gmail every few months, then a while later switching back. I mostly use Apple's Calendar. Because of the nature of their encryption, you can only search using email subject lines with their web clients. I run the Proton Bridge on my laptop just in case I need to search my email. Since most cellphones now have a lot of storage, I really wish the ProtonMail web client would optionally maintain a search index in local device storage (as an option). This would allow me to search my emails on any device. Or, they could make the Bridge available on iOS and Android - this would allow the use of any email clients on mobile and fix search.