Comparison

Tuta Calendar vs PdfNoteViewer

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Tuta Calendar

This secure calendar app offers end-to-end encryption to protect your events and reminders. It features a user-friendly interface, cross-device syncing, and smart reminders, with a free plan and optional premium upgrades.

Highlights
  • Quantum-safe end-to-end encryption
  • Zero tracking and zero-knowledge architecture
  • Secure event sharing
  • Cross-device syncing
  • Multiple calendar views
  • Smart event reminders
  • Offline access
Read full description

PROTECT YOUR PRIVACY WITH TUTA CALENDAR – FREE, SECURE & ENCRYPTED PLANNER Take control of your schedule with Tuta Calendar, the world’s most secure calendar app, trusted by privacy-conscious users worldwide. With quantum-safe encryption, your events, reminders, and schedules stay private. Fast, open source, and free: Tuta Calendar is built with the highest security standards. Plus, it’s perfectly integrated with the Tuta Mail app. WHY CHOOSE TUTA CALENDAR? Stay Secure • Quantum-Safe Encryption: Your entire schedule, including event details and reminders, is fully end-to-end encrypted – only you can access it. • Zero Tracking: No ads, no profiling, no data sharing. Your calendars are yours. • Zero-Knowledge Architecture: We can’t see your events, meeting times, or attendees. Your schedule is invisible to us. • Secure Event Sharing: Share events securely with Tuta users or external calendars via password-protected invites. • GDPR-Compliant & Hosted in Germany: Protected by strict European privacy laws. Boost Your Productivity • Sync Across Devices: Your events instantly update on mobile, web, and desktop. • Recurring Events: Schedule daily, weekly, monthly, yearly, or custom repeating events. • Multiple Calendar Views: Easily switch between agenda, daily, 3-day, weekly, or monthly views. • External Calendar Sync: Subscribe to external calendars – updates happen automatically. • Unlimited Calendar Management (paid feature): Manage multiple calendars and toggle visibility effortlessly. • Offline Access: View and manage your schedule even without an internet connection. Simple & Intuitive • User-Friendly Interface: Modern, clean design with light and dark modes. • Quick Navigation: Create, edit, or delete events in just a few taps. • Smart Event Reminders: Get encrypted notifications to ensure you never miss an appointment. • Email Integration: Link calendar events directly to your Tuta Mail account for seamless scheduling. PRICING Tuta offers a free plan for everyone, plus premium plans with extra features, available monthly or yearly. Every subscription includes Tuta Mail and Tuta Calendar, seamlessly syncing across all your devices. • Free – Secure, encrypted email and calendar at no cost. • Revolutionary – 20 GB, unlimited calendars, calendar invites and sharing, custom domains, and more. • Legend – 500 GB, unlimited calendars, calendar invites and sharing, 30 email addresses, and advanced features. No matter which plan you choose, your communication remains end-to-end encrypted, private, and completely free from tracking. BONUS: GET TUTA MAIL WITH THE SAME ACCOUNT Your Tuta account gives you access to Tuta Mail, the encrypted email service with the same quantum-safe security as your calendar. One account, two essential privacy tools – completely free. WHO IS BEHIND TUTA? Freedom fighters committed to protecting freedom of speech and your right to privacy! • Developed & Hosted in Germany: Adheres to strict GDPR data protection laws. • Private by Design: We can’t access your data – secure password reset ensures your privacy. • End-to-End Encrypted from the Ground Up: Every event, contact, and reminder is encrypted by default. TRUSTED BY SECURITY EXPERTS "Tuta provides an exceptional level of security and privacy... If security is your priority, there’s not much better than Tuta." — TechRadar "Since Tuta is open source and has amazing products in development, I moved my email there." — Journalist Dan Arel "Tuta’s email security is unmatched. Its mobile apps are fast and user-friendly, with fair pricing and a free option." — CyberSynchs JOIN MILLIONS WHO TRUST TUTA Protect Your Schedule: Download Tuta Calendar today and join millions who trust us for secure, encrypted time management. Website: https://tuta.com Open Source Code: https://github.com/tutao/tutanota Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula

About

PdfNoteViewer

Read full description

Read smarter. Focus better. PDFNoteViewer is a distraction-free PDF reader designed for those who actually want to read. Highlight, add notes, and export your documents – all with an elegant, minimal interface. Features: • Intuitive text highlighting (tap again to remove) • Freely place colorful text notes anywhere on your pages • Edit Mode for annotating, Read Mode for distraction-free reading • DarkRead Mode for eye-friendly night reading • Export or print PDFs with all annotations embedded • Auto-backup of your last opened document • No ads, no tracking, no accounts. Ever. Perfect for: Students, researchers, teachers, and everyone who reads and annotates PDFs regularly. Focus on your ideas – not on menus.

Screenshots

Tuta Calendar4 screens
PdfNoteViewer4 screens

Verdict

The call

The clearest difference is price: Tuta Calendar at Free against PdfNoteViewer's $0.99. Tuta Calendar also leads on update cadence (weekly vs every 4 months). PdfNoteViewer's advantage is in-app purchases (none vs 4). On ads, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Tuta Calendar is free to download; PdfNoteViewer costs $0.99 up front. Tuta Calendar sells 4 in-app purchases, starting at $3.99 per month. PdfNoteViewer asks for nothing beyond the download.

UpkeepUpdate frequency

Tuta Calendar ships an update weekly, PdfNoteViewer every 4 months. The most recent releases landed on October 21, 2026 and October 22, 2026 respectively.

Scorecard3 real differences · 7 level
Tuta Calendar versus PdfNoteViewer: the parameters behind the verdict, then further details
ParameterTuta CalendarPdfNoteViewer
PriceFree — better$0.99
Rating4.6 (162 ratings) — better—
Positive reviews56.7% of reviews—
Number of ratings162 — better—
Update frequencyWeekly — betterEvery 4 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.0 — better17.6
Further details — not scored
Size45 MB11 MB
Age rating4+4+
DeveloperTutao GmbHDanyel Kern

Bugs and requests

Tuta Calendar

Reported bugs

19 issues
  • App crashes frequently
  • Widget is not working or is blank
  • Calendar events not saving or changes not saving
  • App logs out automatically and shows invalid credentials
  • Double reminders for appointments
Show 14 more
  • Lost important information/data
  • Calendar subscriptions duplicate entries
  • Cannot delete calendars or calendar subscriptions
  • Cryptic error messages
  • App constantly crashing on opening
  • Login issues
  • FaceID login not working for free accounts
  • Account creation issues (clock puzzle)
  • Search function doesn't work on app
  • Events from calendar subscriptions not syncing
  • App ignores OS font size settings
  • Issues with recurring events being duplicated
  • Calendar entries not visible without connection
  • Events reload every time the app opens

Requested features

31 requests
  • App for the Watch
  • Icon shows current date
  • Ability to see holidays marked
  • Import from Apple calendar
  • Adjustable app opening view (e.g., month view)
Show 26 more
  • Default appointment length setting
  • Color code appointments on the same calendar
  • Widget that shows more than one day
  • Widget that shows entire month
  • Ability to see monthly and agenda view simultaneously
  • Option to zoom/pinch time intervals
  • Move event blocks by dragging
  • Custom settings for specific days of the week
  • Week numbers displayed
  • Full-featured calendar
  • Option to open locations in other map apps
  • More customizability in UI
  • Better readability for low vision users
  • Adjustable text size respecting OS settings
  • More compact week view
  • Display more event details in month view
  • Quick access to distant calendar days
  • Emojis in events
  • Family planner in free tier
  • On-device notes/non-login option
  • Support for holidays by country/region
  • Dark mode option
  • Advanced analytics dashboard
  • Ability to expand week view to include more than 8 hours
  • Sync with other calendar apps
  • More robust search functionality on mobile app

PdfNoteViewer

Not enough reviews yet to summarise bugs or requests.

In-app purchases

4 purchases

Tuta Calendar

Subscriptions4
  • Revolutionary (Monthly)$3.991 Month
  • Legend (Monthly)$9.991 Month
  • Revolutionary (Yearly)$39.991 Year
Show 1 more
  • Legend (Yearly)$99.991 Year
None

PdfNoteViewer

No in-app purchases

Questions

Is Tuta Calendar free?
Tuta Calendar is free to download, with in-app purchases available.
Is PdfNoteViewer free?
PdfNoteViewer costs $0.99, with no in-app purchases.
Do Tuta Calendar or PdfNoteViewer have ads?
Neither Tuta Calendar nor PdfNoteViewer shows ads.
Which is updated more often, Tuta Calendar or PdfNoteViewer?
Tuta Calendar ships an update weekly, and PdfNoteViewer every 4 months. Most recently, Tuta Calendar was updated on October 21, 2026 and PdfNoteViewer on October 22, 2026.

Other comparisons