Atlas Calendar
Atlas Calendar: A capable free web calendar for teams that need sync, permissions, and tasks. Ranked #93 of 193 in Calendar Apps by our editors (3.0/10); pricing: Free plan; best for free teams needing synced calendars and tasks.
At a glance
- Editor score3.0 / 10
- PricingFree plan
- Best forFree teams needing synced calendars and tasks
- Free planYes
- Paid fromFree
- Founded2011 · Tempe, AZ
- Facts checked22 Sep 2026
Where it wins
- Free two-way sync with Google, Outlook, and Apple iCloud
- Shared calendars with per-user read and write permissions
- Tasks, recurring events, CRM links, and file attachments
Where it doesn't
- Available only on the web
- No mobile support
- No scheduling links
Our verdict on Atlas Calendar
Atlas Calendar is a cloud-based shared team calendar for professional services businesses and other organizations. It combines event creation, shared calendars, attendee management, recurring schedules, tasks, attachments, and links to Atlas CRM contacts or entities. Teams that need a common calendar with controlled access and connected work items are the clearest fit.
The Free plan includes two-way synchronization with Google Calendar, Outlook Calendar, and Apple iCloud, along with native CalDAV support for compatible clients such as Apple Calendar and Thunderbird. Shared calendars include per-user read and write permissions, while event imports support ICS, Google Calendar, and Outlook. Atlas CRM and AtlasFS extend the calendar into contact-linked events and file attachments, making it more suitable for teams already working within that wider platform.
Calendar depth is a notable strength. Recurring events support custom RRULE patterns and per-occurrence editing, while attendee invitations track accept, decline, and tentative responses. Task lists add due dates, priorities, and completion tracking alongside calendar entries. The trade-off is a web-only experience: Atlas Calendar does not include mobile support or scheduling links. Choose it for free teams that value synchronized calendars, shared permissions, CalDAV connectivity, and task tracking. Choose another calendar app if mobile access or shareable booking workflows are central to daily scheduling.
Questions about Atlas Calendar
Does Atlas Calendar have a free plan? Yes, there is a free plan.
What does Atlas Calendar run on? Web. It runs in the cloud.
What does Atlas Calendar integrate with? 6 integrations, including Google Calendar, Outlook Calendar, Apple iCloud, CalDAV clients and Atlas CRM.
Who is Atlas Calendar built for? Small businesses, mid-market companies and enterprises (our editorial estimate).
Your product? Our editors can test Atlas Calendar in depth and publish a review, labelled as paid · from $149/mo →
Atlas Calendar pricing
All 1 Atlas Calendar plans and prices →
Atlas Calendar fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Shared calendars | Yes |
| Time blocking | Not verified |
| Scheduling links | Not verified |
| Calendar sync | Two_way |
| Mobile apps | Not verified |
| Video meeting support | Not verified |
| Deployment | Cloud |
| Platforms | Web |
| Support | Phone |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 6 integrations: Google Calendar, Outlook Calendar, Apple iCloud, CalDAV clients, Atlas CRM, AtlasFS |
| Pricing | Free plan (source) |
| Website | hyperionworks.com |
| Facts checked | 22 Sep 2026 |
Atlas Calendar integrations
Atlas Calendar lists 6 integrations on its own site.
- Google Calendar
- Outlook Calendar
- Apple iCloud
- CalDAV clients
- Atlas CRM
- AtlasFS
Alternatives to Atlas Calendar
- Google CalendarA versatile calendar for personal schedules and Google Workspace collaboration.9.4
- Microsoft OutlookA flexible calendar choice for people and teams already working in Microsoft’s ecosystem.9.2
- Zoho CalendarA low-cost calendar with booking, sync, room reservations, and broad integrations.9.1
See all Atlas Calendar alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026
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