Google Calendar Event Checker

Tracking since Apr 5, 2026.

Changelog

• Jun 12, 2026
  description

  Mark Google Calendar events as completed with checkmarks, emojis, or strikethrough and turn your calendar into a task tracker.
  
  It’s the perfect tool for professionals, students, and anyone who wants to mark events as done or canceled and boost productivity.
  
  🆓 Free Version Features 🆓
  Available immediately after installation - no sign-in or subscription required:
  ▸ Customizable completion marks: choose between emojis (✅ or ❌), unicode checkmark (✓), or strikethrough effect (title crossed off).
  ▸ Automatic timestamps: save completion date/time in event description for easy reference.
  ▸ Edit-page marking: mark events as done from the calendar event edit page.
  ▸ Minimal and Privacy-Oriented: the extension is designed to be minimalistic and don’t track any user data. 
  
  
  ⭐ Premium Version Features ⭐
  Unlock advanced productivity and simplicity features:
  ▸ Quick-mark from event dialog: complete events with one click from the event popup.
  ▸ Daily events dashboard: view all today's events in the extension popup with completion status.
  ▸ Mark from any tab: complete calendar events without opening Google Calendar.
  ▸ Custom checkmark slots: add up to 5 emojis or unicode symbols as completion markers.
  ▸ Still Minimal and Privacy-Oriented: we don't see or store any of your events and never share your data.
  
  💡How to Use 💡
  All demo videos available in ➡️ https://calcheckr.com ⬅️
  
  How to use free version:
  ▸ Install the extension, no sign in needed
  ▸ Open any Google Calendar event for editing
  ▸ Click the completion mark button (✅)
  ▸ Save the event
  ▸ Go to the extension's options to configure the completion marks and a strike-through effect.
  
  How to use premium version:
  ▸ Pin extension and sign in with your Google account
  ▸ Start free trial (no credit card needed)
  ▸ Mark events as completed from an event dialog
  ▸ Mark events as completed from "Today events" view
  ▸ Configure custom checkmarks and a strike-through effect in ⚙️ User Settings page (available after sign in).
  
  All demo videos available in ➡️ https://calcheckr.com ⬅️
  
  🚀 Supported browsers 🚀
  ▸ Google Chrome
  ▸ Microsoft Edge
  ▸ Any other chromium-based browsers: Brave, Opera, Yandex
  
  ⚠️ Troubleshooting ⚠️ 
  If something isn't working properly, here's what you can try:
  ▸ Make sure you can edit event title from an event edit page - some events are not editable at all - for example: working locations, contacts’ birthdays calendar, shared calendars if you don’t have proper permissions.
  ▸ Sign out and sign back to the extension (for premium users).
  ▸ Reinstall the extension.
  ▸ Report an issue to [email protected], include screenshots if possible as it might help to resolve your case more quickly, make sure to mention what browser you’re using.
  
  ❓Frequently Asked Questions❓
  Q: How do I mark Google Calendar events as completed? 
  A: Install the extension, open any event, and use the completion button or choose your preferred visual mark (checkmark, emoji, or strikethrough).
  
  Q: Will other people see my completion marks? 
  A: Yes! Since changes save directly to Google Calendar, anyone with calendar access sees the completion marks. Great for team collaboration.
  
  Q: Does this work with Google Workspace? 
  A: Absolutely! Works with personal Google accounts and Google Workspace (formerly G Suite) accounts.
  
  Q: Does it work with recurring events? 
  A: Yes! Mark individual instances or the entire series.
  
  Q: Can I use the free version forever? 
  A: Yes! The free plan includes core features. Upgrade to Premium only if you want one-click marking, daily views, and custom checkmarks.
  
  Q: Is my calendar data secure? 
  A: Absolutely! We use only Google infrastructure. Authentication tokens are encrypted, and we never see, store, or share your calendar events data.
  
  Q: How do I cancel Premium? 
  A: Cancel anytime from the Stripe customer portal. Premium features remain active until your billing period ends, then you automatically return to the free plan.
  
  📧 Contacts 📧 
  For any questions, comments and ideas please reach out to [email protected]
  
  ================================================
  Changelog
  2.4.0 - 02/04/2026:
  - internal fixes, feedback tab, trial clarifications
  
  2.3.1 - 01/04/2026:
  - internal fixes
  
  2.3.0 - 12/24/2025:
  - workspaces support
  
  2.2.1 - 12/18/2025:
  - internal fixes
  
  2.2.0 - 12/10/2025:
  - premium: strikethrough effect in popup view
  - premium: date picker for quick navigation
  
  2.1.2 - 12/06/2025:
  - internal fixes: make completion detection to be based on the default + custom checkmarks only
  
  2.1.1 - 12/03/2025:
  - internal fixes
  - options page UI refactoring
  
  2.1.0 - 12/01/2025:
  - internal fixes
  - add unicode symbol (✓) in free version
  - custom checkmarks in premium version
  
  2.0.2 - 11/24/2025:
  - internal fixes
  - add support id in extension options
  
  2.0.1 - 11/18/2025:
  - internal fixes
  - show onboarding page once
  - start introducing premium version
  
  2.0.0 - 11/12/2025:
  - strikethrough effect fixes
  - performance improvements (button should appear faster)
  - preview of premium version
  
  1.6.5 - 02/09/2024:
  - Internal improvements in error reporting
  
  1.6.4 - 05/26/2023:
  - fix button size
  
  1.6.3 - 01/06/2023:
  - Internal improvements in error reporting
  
  1.6.2 - 12/13/2022:
  - Fix issue with not showing button (input selector got updated)
  
  1.6.1 - 10/09/2022:
  - Minor internal fixes
  
  1.6.0 - 10/09/2022:
  - Add error and usage reporting option
  
  1.5.0 - 09/16/2022:
  - Internal improvements in rendering button
  
  1.4.0 - 02/26/2022:
  - add crossed mark button ❌  (as a visual cue of canceled event)
  
  1.3.1 - 01/02/2022:
  - removed redundant permission 'activeTab'
  
  1.3.0 - 10/07/2021:
  - the strikethrough effect is now configurable in options
  
  1.2.0 - 10/05/2021:
  - issue with search was fixed by saving origin event's title in the description area (configurable in options)
  - add date and time label when it was completed to the description textarea (configurable in options)
  
  1.1.0 - 10/04/2020:
  - add check emoji in the beginning (configurable in options)
  - fix issue for event titles with emojis

  Mark Google Calendar events as completed with checkmarks, emojis, or strikethrough and turn your calendar into a task tracker.
  
  It’s the perfect tool for professionals, students, and anyone who wants to mark events as done or canceled and boost productivity.
  
  🆓 Free Version Features 🆓
  Available immediately after installation - no sign-in or subscription required:
  ▸ Customizable completion marks: choose between emojis (✅ or ❌), unicode checkmark (✓), or strikethrough effect (title crossed off).
  ▸ Automatic timestamps: save completion date/time in event description for easy reference.
  ▸ Edit-page marking: mark events as done from the calendar event edit page.
  ▸ Minimal and Privacy-Oriented: the extension is designed to be minimalistic and don’t track any user data. 
  
  
  ⭐ Premium Version Features ⭐
  Unlock advanced productivity and simplicity features:
  ▸ Quick-mark from event dialog: complete events with one click from the event popup.
  ▸ Daily events dashboard: view all today's events in the extension popup with completion status.
  ▸ Mark from any tab: complete calendar events without opening Google Calendar.
  ▸ Custom checkmark slots: add up to 5 emojis or unicode symbols as completion markers.
  ▸ Still Minimal and Privacy-Oriented: we don't see or store any of your events and never share your data.
  
  💡How to Use 💡
  All demo videos available in ➡️ https://calcheckr.com ⬅️
  
  How to use free version:
  ▸ Install the extension, no sign in needed
  ▸ Open any Google Calendar event for editing
  ▸ Click the completion mark button (✅)
  ▸ Save the event
  ▸ Go to the extension's options to configure the completion marks and a strike-through effect.
  
  How to use premium version:
  ▸ Pin extension and sign in with your Google account
  ▸ Start free trial (no credit card needed)
  ▸ Mark events as completed from an event dialog
  ▸ Mark events as completed from "Today events" view
  ▸ Configure custom checkmarks and a strike-through effect in ⚙️ User Settings page (available after sign in).
  
  All demo videos available in ➡️ https://calcheckr.com ⬅️
  
  🚀 Supported browsers 🚀
  ▸ Google Chrome
  ▸ Microsoft Edge
  ▸ Any other chromium-based browsers: Brave, Opera, Yandex
  
  ⚠️ Troubleshooting ⚠️ 
  If something isn't working properly, here's what you can try:
  ▸ Make sure you can edit event title from an event edit page - some events are not editable at all - for example: working locations, contacts’ birthdays calendar, shared calendars if you don’t have proper permissions.
  ▸ Sign out and sign back to the extension (for premium users).
  ▸ Reinstall the extension.
  ▸ Report an issue to [email protected], include screenshots if possible as it might help to resolve your case more quickly, make sure to mention what browser you’re using.
  
  ❓Frequently Asked Questions❓
  Q: How do I mark Google Calendar events as completed? 
  A: Install the extension, open any event, and use the completion button or choose your preferred visual mark (checkmark, emoji, or strikethrough).
  
  Q: Will other people see my completion marks? 
  A: Yes! Since changes save directly to Google Calendar, anyone with calendar access sees the completion marks. Great for team collaboration.
  
  Q: Does this work with Google Workspace? 
  A: Absolutely! Works with personal Google accounts and Google Workspace (formerly G Suite) accounts.
  
  Q: Does it work with recurring events? 
  A: Yes! Mark individual instances or the entire series.
  
  Q: Can I use the free version forever? 
  A: Yes! The free plan includes core features. Upgrade to Premium only if you want one-click marking, daily views, and custom checkmarks.
  
  Q: Is my calendar data secure? 
  A: Absolutely! We use only Google infrastructure. Authentication tokens are encrypted, and we never see, store, or share your calendar events data.
  
  Q: How do I cancel Premium? 
  A: Cancel anytime from the Stripe customer portal. Premium features remain active until your billing period ends, then you automatically return to the free plan.
  
  📧 Contacts 📧 
  For any questions, comments and ideas please reach out to [email protected]

Permissions & access

Permissions

storagewebRequest

Host access

https://calendar.google.com/*

Screenshots

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