To-Do Calendar Planner

In-app purchases
4.2
35.4K reviews
1M+
Downloads
Content rating
PEGI 3
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About this app

The ultimate personal organizer!

• Use a powerful task list that supports batch operations
• Enjoy a fully scrollable calendar with daily, weekly, monthly and agenda view
• Define your personal goals and add tasks to them
• Set multiple reminders for tasks and events
• Divide your tasks into subtasks
• Set repeating tasks and events
• Use resizable Widgets in 4 different formats
• Attach files and photos to your tasks and appointments
• Sync your data between devices without effort
• Attach Google Maps locations to your tasks and events
• Use a daily journal to keep track of your life
• Never forget the birthdays of your friends
• Apply GTD principles to your daily life
• Schedule your tasks directly on the calendar
• Draw your own notes and attach them to tasks and events
• Convert your tasks, goals, notes and events into each other
• Create audio recordings and attach them to your tasks and events
• Access your data from a PC (web version www.isotimer.com)

Advanced features (Premium Upgrade):
- Plan your goals in project view
- Collaborate on tasks, projects, events.
- Track your progress with detailed progress reports
- Get organized with a daily step-by-step routine
- Use the Clean-Up feature to easily prioritize your task list
- Create backups and restore them
- Protect your data with a password
- Export your data to CSV files


With isoTimer you can:

...orient yourself toward your goals
...prepare each day with care using a calendar and a to-do list
...balance your professional and your private life
...focus on the most important tasks
...never forget ideas or events

IsoTimer organizer is the ideal companion for planning all parts of your life!
The perfect ToDo Calendar Planner for personal and business use.
Updated on
May 23, 2025

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Personal info, Calendar and 3 others
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

4.2
32K reviews
cheryl bowens
March 24, 2021
This calendar is almost perfect for my needs. The journal, task, color coding and notes. The only thing I have to use another calendar for, is an ICS function were by I can share a date on the calendar and the other person doesn't have to copy and paste they just click the add button and it is added to their calendar. I do recommend this calendar
13 people found this review helpful
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Mariel
May 6, 2023
I've been noticing for a while (several months now) that I set reminders but don't get any reminder notifications (app notif are on in my phone settings and reminders are enabled in app). Please fix. I will then give it 5 stars again. The week view is EXACTLY as I like it. Free version also allows for nice customization (like dark mode). Cannot find another app that comes close. And I looked!
4 people found this review helpful
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A Google user
September 12, 2019
I have used this app for years and rated it 5 stars. Recently items added to the app are not recorded, but if I add something to other calander apps they are added to the To-Do (isotimer) app. Other items that I knew were added have disappeared. This has caused great difficulty with my schedule due to lost appointments. E-mailed developer but no response. Had to uninstall.
14 people found this review helpful
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What’s new

Bugfixes