Calendar extension comparison
| Extension | Checker Plus | Google Calendar website | Button for Google Calendar |
| Ratings | ★★★★★ | ★★★★★ | |
| Notifications | • | • | • |
| Notification sounds | 15 | 1 | 1 |
| Push Notifications | • | • | |
| Month view | • | • | |
| Week view | • | • | |
| Agenda view | • | • | • |
| 4 Week view | • | • | |
| Event time on button | • | • | |
| Click day to add events | • | • | |
| Add the current browser tab to your calendar | • | ||
| Notifications with buttons | • | • | |
| Multiple snooze times | • | ||
| Options | 100 | 20 | 5 |
| Forum support | • | • | |
| Run in background | • | ||
| Customizable icons | • | ||
| Voice Notifications | • | ||
| Do Not Disturb (DND) | • | ||
| How to videos | • |
