Google Calendar 代替ツール比較
5サービスを4軸で評価。総合点の高い順に並べています。詳細は各ツールページへ。
| ツール | プライバシー | 使いやすさ | 機能の豊富さ | コスパ | 総合 |
|---|---|---|---|---|---|
| Proton Calendar | ★★★★★ | ★★★★★ | ★★★★★ | ★★★★★ | 16/20 |
| Nextcloud Calendar | ★★★★★ | ★★★★★ | ★★★★★ | ★★★★★ | 18/20 |
| EteSync | ★★★★★ | ★★★★★ | ★★★★★ | ★★★★★ | 16/20 |
| Fastmail Calendar | ★★★★★ | ★★★★★ | ★★★★★ | ★★★★★ | 17/20 |
| Radicale | ★★★★★ | ★★★★★ | ★★★★★ | ★★★★★ | 14/20 |
詳細比較マトリクス
| 項目 | Proton Calendar | Nextcloud Calendar | EteSync | Fastmail Calendar | Radicale |
|---|---|---|---|---|---|
| 料金 | Free + paid | Self-hosted | Free + paid | Paid | Self-hosted |
| 難易度 | Easy | Advanced | Moderate | Easy | Advanced |
| OSS | — | ✓ | ✓ | — | ✓ |
| データ保存 | Switzerland (Proton AG); zero-access—servers hold ciphertext only. | Your self-hosted server location. | EteSync cloud (UK) or self-host; E2EE—server sees ciphertext only. | Australia (Fastmail Pty Ltd). | Your self-hosted server. |
| Privacy | 5/5 | 5/5 | 5/5 | 4/5 | 5/5 |
| Ease of use | 4/5 | 3/5 | 3/5 | 5/5 | 2/5 |
| Features | 3/5 | 5/5 | 4/5 | 4/5 | 2/5 |
| Value | 4/5 | 5/5 | 4/5 | 4/5 | 5/5 |
総合ランキング
- 1 Nextcloud Calendar
Self-hosted CalDAV calendar
18 /20 - 2 Fastmail Calendar
High-quality CalDAV calendar
17 /20 - 3 Proton Calendar
End-to-end encrypted calendar
16 /20 - 4 EteSync
E2EE CalDAV synchronization
16 /20 - 5 Radicale
Minimal CalDAV server
14 /20