Alternatives to Google Calendar
(for Sovereign Cloud & Privacy-Focused Users – 2026)
Google Calendar is convenient, free, and feature-rich — but it comes with full visibility into your schedule, events, locations, and habits by Google. If you want more privacy, data ownership, or independence from Big Tech, here are the most practical alternatives — split into hosted privacy-friendly services and self-hosted / open-source options.
Hosted Privacy-Focused Alternatives
These are managed services that emphasize encryption and privacy (no Google/Microsoft-level data mining).
| Service | Encryption | Free Tier Limits | Custom Domain | Sharing / Collaboration | Best For | Approx. Paid Price |
|---|---|---|---|---|---|---|
| Proton Calendar | End-to-end (E2EE) | Unlimited events, basic sharing | Yes (paid) | Yes (with contacts) | Best privacy + clean UX | ~€4–5/mo (Plus) |
| Tuta Calendar | End-to-end + quantum-safe | Good free storage & events | Yes (paid) | Yes | Maximum security focus | ~€3–8/mo |
| Nextcloud hosted | Server-side (can be E2EE) | Depends on provider | Yes | Excellent | All-in-one cloud feel | Varies (~€5–10/mo) |
Top recommendation (hosted): Proton Calendar → if you already use or plan to use Proton Mail/VPN/Drive. It offers excellent privacy, a modern interface, and reliable mobile/web apps.
Self-Hosted & Open-Source Alternatives
These give you full control over your data. They run on your own VPS or home server (fits well in a 10–20 GB sovereign setup). Most use the standard CalDAV protocol so any client (Thunderbird, Android DAVx⁵, iOS built-in, etc.) can connect.
| Solution | Type | Ease of Setup | Web Interface | Mobile Sync | Resource Usage | Standout Feature | Recommended For |
|---|---|---|---|---|---|---|---|
| Nextcloud + Calendar | All-in-one suite | ★★☆☆☆ | Excellent | Native apps | 500 MB–2 GB RAM | Rich features, file sync, contacts | Most people (best balance) |
| Radicale | Lightweight CalDAV | ★★★★☆ | Basic / none | Any CalDAV | <100 MB RAM | Extremely simple & stable | Minimalists |
| Baïkal | Lightweight CalDAV | ★★★★☆ | Simple web | Any CalDAV | <200 MB RAM | Clean admin interface | Simple calendar + contacts |
| Xandikos | Very lightweight | ★★★★☆ | None | Any CalDAV | <50 MB RAM | Pure CalDAV server | Ultra-minimal |
| Mailcow / iRedMail | Full groupware | ★★☆☆☆ | Good (SOGo) | Any CalDAV | 1–3 GB RAM | Email + calendar bundle | If you're already self-hosting mail |
| SOGo | Groupware | ★★★☆☆ | Very good | Native | ~500 MB–1 GB | Professional look & feel | Team / family sharing |
Quick Recommendations by Use Case (2026)
| Your Priority | Best Choice | Why |
|---|---|---|
| Best overall self-hosted experience | Nextcloud Calendar | Modern web UI, mobile apps, sharing, tasks, contacts — closest Google Calendar feeling |
| Ultra-minimal resource usage | Radicale or Xandikos | Runs on tiny VPS slice, almost no overhead |
| Privacy + no server management | Proton Calendar | E2EE, zero hassle, great apps |
| Already self-hosting email | Mailcow or iRedMail (with SOGo) | One service for mail + calendar |
| Family / team sharing | Nextcloud or SOGo | Strong multi-user support |
Typical Self-Hosted Setup Tips
- Use CalDAV → install DAVx⁵ (Android) or use built-in clients (iOS, Thunderbird, Evolution)
- Add HTTPS → Let’s Encrypt (automatic with most setups)
- Backup → Regular database + data folder rsync or export to your sovereign storage
- Clients → Most people use:
- Android → DAVx⁵ + any calendar app (e.g. Simple Calendar)
- iOS → Built-in Calendar (add CalDAV account)
- Desktop → Thunderbird, Evolution, or web interface
Size & Resource Reality Check
Even with years of events, calendar data is tiny:
- Nextcloud Calendar database → usually < 50–200 MB even for heavy users
- Pure CalDAV servers (Radicale, Baïkal) → < 10–50 MB in most cases
Fits easily inside your 10–20 GB sovereign budget.
Bottom line for sovereign cloud users in 2026:
- Want privacy + zero effort → Proton Calendar
- Want full control + nice interface → Self-host Nextcloud Calendar
- Want maximum minimalism → Self-host Radicale
All of these options keep your schedule out of Big Tech surveillance while maintaining (or exceeding) the core functionality you expect from Google Calendar.