About Google Calendar
You don't need a dedicated app to time-block — Google Calendar does it for free. Create colour-coded blocks for deep work, admin and breaks, set them to repeat, and you have a working time-blocking system. Add the Tasks sidebar and you can drag to-dos onto the day directly.
The best free, no-frills option. Manual time blocking in Google Calendar is how most people should start before paying for anything fancier.
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The honest list
What we love
＋Completely free
＋Universally compatible
＋Colour-coded repeating blocks
＋Built-in Tasks integration
Watch out for
−Fully manual — no automation
−No task durations or estimates
−Easy to abandon without discipline