ML revenue forecast.
Calibrated against 2218 apps in this category.
Confidence band
±15%
High — many comparable apps with verified data
At a glance
Earns 2.3× less than the category median (1.0K/mo).
Ranks #1,547 of 2,218 in Productivity (top 69.7% by revenue).
Ratings volume grew 192.4% over the last 30 days, suggesting active user acquisition.
Launched Nov 30, 2022 · last updated Mar 25, 2026.
24 months of snapshot history tracked.
What the app looks like
Live screenshots from the App Store, captured by our snapshot worker. Tap any image to enlarge.
Proton Calendar's revenue trajectory
Forecast revenue from snapshot history. Last 24 months.
Where Proton Calendar sits in Productivity
Revenue distribution of 2218 comparable apps. Proton Calendar highlighted.
Proton Calendar vs comparable apps
Revenue trajectory side-by-side. Bold = Proton Calendar, ghosted = peers.
App spec
Version
2.25.0
Last update
Mar 25, 2026
Launched
Nov 30, 2022
Min OS
16.0
Rating
4+
Price
Free
Monetization
Freemium
Languages
BE, CA, CS, DA +22
What Proton Calendar actually does (from App Store listing)
A calendar is a record of your life: Proton Calendar helps keep it private.
Make the most of your time
- See your upcoming events as you like with agenda or day view
- View and reply to invites
- Events and invites are automatically added to your calendar from your Proton Mail inbox
- View your schedule in light or dark mode
- Add multiple reminders for your events
- Create recurring events on a daily, weekly, monthly, yearly, or custom basis
- Keep your calendar in sync across all your devices…
A calendar is a record of your life: Proton Calendar helps keep it private.
Make the most of your time - See your upcoming events as you like with agenda or day view - View and reply to invites - Events and invites are automatically added to your calendar from your Proton Mail inbox - View your schedule in light or dark mode - Add multiple reminders for your events - Create recurring events on a daily, weekly, monthly, yearly, or custom basis - Keep your calendar in sync across all your devices
Private by default - No ads, no trackers, and no data harvesting - We can’t spy on your calendar or misuse your data - Protected by the same end-to-end encryption used in Proton Mail - Event names, descriptions, and participants are stored with zero-access encryption - Based in Switzerland, all your data is protected by strict Swiss privacy laws
People before profits - Funded by users, not advertisers — Privacy is our business model - Built by scientists and engineers who met at CERN and MIT and founded Proton Mail - Used by high-profile journalists and organizations globally
What others say about Proton: “Proton has now made it stupid-easy to encrypt your schedule. Information about what you plan to do, where, and with whom, can be just as sensitive as the messages you send and receive.” Gizmodo
Follow Proton on social media for all the latest news and offers: Facebook: /proton Twitter/X: @protonprivacy Reddit: /protonmail Instagram: /protonprivacy
Each forecast combines App Store rating, ratings count, monetisation model, pricing tier, IAP signals and ad-supported flag.
The base estimate is then multiplied by a per-category scaling factor learned from apps with founder-verified MRR.
Every number on this page comes from public APIs and bumetric's own snapshot history.
Full methodology covers input variables, accuracy bands per category and how we treat apps without comparable anchors.
See also the live data on Proton Calendar's tracker page for current rating, reviews and snapshot timeline.
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