I use iPhone, Windows (work laptop) and Linux (personal laptop), so keep that in mind when looking at my suggestions. I have also a Proton unlimited subscription.
- Email: Proton Mail + Simplelogin aliases / Tuta as backup
- Cloud storage: Proton Drive / Filen
- Maps: Magic Earth / OpenStreetMap
- Search engine: Qwant
- Web browser: Zen browser (Firefox fork) / Quiche browser (iOS)
- Calendar: Apple Calendar (our family calendar is here, hard to use something else) / Thunderbird (apple calendar caldav imported)
- Contacts management: Proton / iOS
- Notes / to-do lists: Notesnook / iOS
- Office suite (docs, spreadsheets, etc.): MS Office (work) / Libreoffice (personal)
- Messaging / chat: Signal / SimpleX
- Video calling: Signal
- Social media / microblogging RSS reader / news: Mastodon / Bluesky / Reddit / Lemmy
- Music streaming / podcast app: Tidal (pays artists more and Spotify donated to Trump) / Pocket Casts
- Video streaming / YouTube alternative: Grayjay (Windows/Linux) / Unwatched (iOS)
- Password manager: Proton Pass
- VPN / DNS / Firewall: Proton VPN
- Launcher / Android OS (if you use custom ROMs): iOS
- App store / APKs: iOS
- Photo backup / gallery: Proton Drive
- Weather: iOS
- Smart assistant (if any): Nope
- Anything else you’ve replaced? MS authenticator -> Ente Auth Reddit iOS app -> Hydra Notion -> Anytype
I know that some of my solutions are bonded to Apple, but I am also regularly searching for Apple alternatives and focus on apps that are cross platform to make a possible deApple process smoother in the future.