Proton Calendar pricing
Proton Calendar has a free plan and paid plans. Starting price: $3.99 a month, billed annually (Mail Plus). Free plan: Yes, $0 a month.
Proton Calendar plans and prices
Every line links to the page it came from. Prices are what Proton Calendar publishes; taxes, currency and regional pricing can change what you pay.
Proton Calendar pricing facts
4 of 4 verified- Free plan
- Yes, $0 a month
- Checked Nov 1, 2026proton.me(opens source in a new tab)
- “$0.00 /month Get Free”
- Starting price
- $3.99 a month, billed annually (Mail Plus)
- Checked Nov 1, 2026proton.me(opens source in a new tab)
- “Billed at $47.88 every 12 months.”
- Mail Plus plan
- $4.99 a month, or $3.99 a month billed annually
- Checked Nov 1, 2026proton.me(opens source in a new tab)
- “Mail Plus Advanced features for your everyday communications $4.99 $3.99 /month”
- Unlimited plan
- $12.99 a month, or $9.99 a month billed annually
- Checked Nov 1, 2026proton.me(opens source in a new tab)
- “23% off Unlimited Experience the best of Proton with one subscription $12.99 $9.99 /month Buy Unlimited”
Proton Calendar alternatives by price
Starting prices from each app's own site, ranked by our alternatives score.
| App | Pricing | Price | Free plan |
|---|---|---|---|
 Tuta Calendar | Free plan + paid | — | 1 |
 Google Calendar | Free plan + paid | — | — |
 Fossify Calendar | Open source | — | — |
 Zoho Calendar | Free | — | — |
 KOrganizer | Open source | — | — |
Proton Calendar pricing: common questions
Is Proton Calendar free?
Proton Calendar has a free plan: Yes, $0 a month. Paid plans add more.
How much does Proton Calendar cost?
Starting price: $3.99 a month, billed annually (Mail Plus), according to proton.me (checked Nov 1, 2026). Prices can vary by country and billing period.
What are free alternatives to Proton Calendar?
Free or freemium alternatives include Tuta Calendar, Google Calendar, Fossify Calendar and Zoho Calendar. Open-source options: Tuta Calendar, Fossify Calendar and KOrganizer.