Proton Calendar vs Zoho Calendar

Proton Calendar

• People who want event details kept unreadable to the provider
• Existing Proton Mail users who want invitations handled in the inbox
• Privacy-focused organizations standardizing on Proton's business suite

Zoho Calendar

• Teams already using Zoho Mail or Zoho Workplace
• Individuals who want a free web calendar with one booking page
• Organizations that need free/busy lookups across Zoho, Exchange and Google

Proton Calendar

• Proton Free allows 3 personal calendars; Mail Plus and higher plans allow 25.
• Calendar sharing and booking pages need a paid plan, and Mail Plus and Proton Unlimited include only 1 booking page.
• Calendar has no subscription of its own: paid features come with Mail Plus, Proton Unlimited or a business plan.
• Desktop use is through the Proton Mail app for Mac, Windows and Linux, a 14-day trial on free accounts; the Linux app is labeled beta.

Zoho Calendar

• Free users can create 1 appointment booking link; paid Zoho Mail or Workplace users can create up to 10.
• Resource booking for meeting rooms is available only with a paid Zoho Mail plan.
• There is no standalone paid Calendar plan: upgrades are Zoho Mail or Workplace subscriptions, and Mail Lite and Mail Premium are billed annually only.
• Calendar's own apps are for the web, iOS and Android; Zoho's Trident desktop app for macOS and Windows is listed on paid plans.

Proton Calendar

End-to-end encrypted events

An event's title, description, location and attendees are encrypted on your device. Events received from people on other calendar services are stored with zero-knowledge encryption.

Appointment booking pages

Publish a booking page that shows only the times you choose and syncs with your calendars to prevent double bookings. Confirmed meetings can include a Proton Meet link. Paid plans only.

Calendar sharing

On paid plans, share a calendar by link or by inviting people directly, showing either full event details or only your availability.

Works with Proton Mail

Send invitations from a Proton Mail address, manage them without leaving the inbox, and add events received by email, such as flights or meetings, to the calendar.

Recurring events and reminders

Events can repeat daily, weekly, monthly or on a custom pattern, with several reminders or email alerts each. Views switch between day, week and month.

Import and calendar subscriptions

The Easy Switch tool imports existing calendars from other providers, and you can subscribe to calendars that other people keep on a different service.

Zoho Calendar

Events with Smart Add

Type a phrase such as "Meeting with John tomorrow at 2pm" and the event is created. Views switch between day, week, month and agenda, and events move by drag and drop.

Appointment booking pages

Share a booking page with set durations, buffer times and a daily cap, and require guests to verify their email. Free users get 1 booking link; paid users get up to 10.

Shared and group calendars

Share a calendar publicly or with chosen people, create group calendars for a team, and subscribe to holiday, public or colleagues' calendars.

Sync with other calendars

Two-way sync with Google Calendar and Outlook lets you add, edit and delete their events in Zoho Calendar. Calendly events can be viewed, and CalDAV and Exchange ActiveSync connect other apps and devices.

Resource booking

Check the availability of meeting rooms and other resources in your organization and book them in advance. Available only on paid Zoho Mail plans.

Interoperability and API

Admins can let Zoho users and Microsoft Exchange or Google Calendar users see each other's free/busy status. A REST API and a Zapier integration are available.

Proton Calendar

• Proton Free$0

  3 personal calendars, end-to-end encryption, and sending and receiving invitations.

• Mail Plus$3.99

  per month, billed every 12 months ($47.88); $4.99 billed monthly

  25 personal calendars, calendar sharing and 1 booking page, plus 15 GB of storage and 10 email addresses.

• Proton Unlimited$9.99

  per month, billed every 12 months ($119.88); $12.99 billed monthly

  The same calendar features as Mail Plus, bundled with 500 GB of storage and Proton's VPN, password manager and cloud storage.

• Workspace Standard$12.99

  per user / month, billed every 12 months ($155.88)

  Business suite with 25 calendars and 25 booking pages per user, 1 TB of storage per user and 15 custom email domains.

• Workspace Premium$19.99

  per user / month, billed every 12 months ($239.88)

  Everything in Workspace Standard, plus 3 TB of storage per user, 20 custom email domains and data retention policies.

• EnterpriseCustom

  All Proton services in a customizable package with a dedicated account manager; priced through sales.

Zoho Calendar

• Free$0

  The calendar with events, sharing, subscriptions, sync and 1 booking link. Zoho's Mail Free plan covers up to 5 users.

• Mail Lite$1

  per user / month, billed annually; no monthly plan

  Zoho Mail with 5 GB of mail storage per user ($1.25 for 10 GB) and shared calendars. Paid users can create up to 10 booking links.

• Workplace Standard$3

  per user / month, billed annually ($4 billed monthly)

  30 GB of mail storage per user, plus WorkDrive file storage, the office apps, Cliq chat and Zoho Meeting next to Calendar.

• Mail Premium$4

  per user / month, billed annually; no monthly plan

  50 GB of mail storage per user plus 50 GB of retention storage, with email retention and eDiscovery, S/MIME and shared calendars.

• Workplace Professional$6

  per user / month, billed annually ($7 billed monthly)

  100 GB of mail storage per user, 1 TB of team file storage, and the full Workplace suite including Meeting, Vault and Connect.

• Workplace EnterpriseCustom

  The highest plans and custom limits of the included Workplace products, priced through sales.

Proton Calendar

• Annual discount

  20% off Mail Plus on the 12-month plan

  Proton's pricing page lists Mail Plus at $3.99 a month when billed every 12 months ($47.88), against $4.99 billed monthly. Proton Unlimited is $9.99 instead of $12.99.

• Education

  Student discount for the first 12 months

  Students verified through Student Beans get 50% off Mail Plus and 62% off Proton Unlimited for the first 12 months; the plan then renews at the regular price.

• Nonprofit

  Reduced pricing for registered nonprofits

  Registered nonprofits can request discounted pricing on Proton's business plans from the sales team. No fixed percentage is published.

Zoho Calendar

• Annual discount

  Lower Workplace rates with annual billing

  Zoho's pricing lists Workplace Standard at $3 per user a month billed annually against $4 billed monthly, and Workplace Professional at $6 against $7.