Comparison

BUNKR Secure Messaging & Vault vs Tuta Calendar

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

Head to head
About

BUNKR Secure Messaging & Vault

Securely store and organize all your important digital and physical documents. Share sensitive information with trusted contacts and access it anytime, anywhere, even offline. Designed for ultimate privacy and productivity.

Highlights
  • Secure cloud storage for files, notes, and passwords
  • Import/export with popular apps
  • Scan and digitize physical documents
  • Invitation-only secure messaging
  • Offline access to stored information
  • Automatic cross-device synchronization
  • Rapid search functionality
Features
Read full description

ONE APP. EVERYTHING IMPORTANT. SECURE. Protect your digital life with BUNKR, the all-in-one privacy and security app that brings your documents, passwords, private messaging, file sharing, and secure calls together in one place. Built with bank-grade security, BUNKR makes it simple to protect sensitive information, stay organized, and communicate privately with people you trust. No juggling multiple apps. No complicated security routines. Just one secure place for what matters most. EVERYTHING YOU NEED. ALL IN ONE APP. Secure Document Vault Store and organize IDs, passports, financial records, insurance documents, travel information, and important files in one encrypted digital vault. Secure Password Manager Protect and manage passwords for banking, shopping, travel, and online accounts. Securely share account information with people you trust. Private Messaging & File Sharing Send private messages, share sensitive files and entire folders, and communicate with trusted contacts in a secure environment designed to help prevent unwanted connections. Secure Audio & Video Calls Make private audio and video calls without switching between multiple communication apps. Document Scanner & Private Notes Scan documents directly into your secure vault and keep important notes, personal details, and sensitive information organized. Multi-Device Access Access your important information across supported devices with secure synchronization, keeping everything connected and organized. BANK-GRADE SECURITY. MADE SIMPLE. Your privacy and security are built into every part of BUNKR. - Always-On Encryption: Your information is encrypted in cloud storage and on your device. - Biometric Authentication: Add an important layer of protection when accessing BUNKR on your phone. - Private Connections: Connect and communicate with people you trust, with protections against unknown or unwanted contacts. - Privacy by Design: Your personal information is never sold to third parties. - Built by Security Experts: Created by entrepreneurs with decades of experience protecting sensitive information. - Live Human Support: Get help from real people when you need it. YOUR DIGITAL LIFE. ONE SECURE PLACE. From everyday passwords and personal documents to private conversations and important files, BUNKR brings the tools you need together in one simple, secure app. Protect what matters. Stay connected. Take control of your digital life. Get started with BUNKR today.

About

Tuta Calendar

This app offers a secure, end-to-end encrypted calendar to protect your privacy. It provides essential planning tools like recurring events and multiple views, with seamless integration for privacy-conscious users.

Highlights
  • Quantum-safe end-to-end encryption
  • Zero tracking and data sharing
  • Sync across mobile, web, and desktop
  • Recurring and external calendar sync
  • Multiple calendar views
  • Offline access
  • Secure event sharing
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

Screenshots

BUNKR Secure Messaging & Vault4 screens
Tuta Calendar4 screens

Verdict

The call

The clearest difference is review sentiment: BUNKR Secure Messaging & Vault at 93% against Tuta Calendar's 57%. BUNKR Secure Messaging & Vault also leads on rating (4.9 vs 4.6) and device support (4 vs 2). Tuta Calendar's advantage is update cadence (weekly vs every 3 weeks). On price, ratings volume, ads and in-app purchases 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

Both are free to download. BUNKR Secure Messaging & Vault sells 4 in-app purchases, starting at $29.99 per year and Tuta Calendar sells 4 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

BUNKR Secure Messaging & Vault holds the better App Store score, 4.9 against 4.6. Both are backed by a comparable volume of ratings — 112 and 165 respectively. Written reviews point the same way: 93% of BUNKR Secure Messaging & Vault's written reviews are positive against 57% of Tuta Calendar's.

UpkeepUpdate frequency

BUNKR Secure Messaging & Vault ships an update every 3 weeks, Tuta Calendar weekly. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

Scorecard5 real differences · 5 level
BUNKR Secure Messaging & Vault versus Tuta Calendar: the parameters behind the verdict, then further details
ParameterBUNKR Secure Messaging & VaultTuta Calendar
PriceFreeFree
Rating4.9 (112 ratings) — better4.6 (165 ratings)
Positive reviews93.2% of reviews — better57.1% of reviews
Number of ratings112165 — better
Update frequencyEvery 3 weeksWeekly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad
Requires iOS14.0 — better16.0
Further details — not scored
Size97 MB46 MB
Age rating4+4+
DeveloperBUNKRTutao GmbH

Customer experience

BUNKR Secure Messaging & Vault

All ratings112 ratings
Positive98.2%
Neutral0.0%
Negative1.8%
Written reviews44 reviews
Positive93.2%
Neutral2.3%
Negative4.5%

Tuta Calendar

All ratings165 ratings
Positive90.3%
Neutral3.0%
Negative6.7%
Written reviews70 reviews
Positive57.1%
Neutral14.3%
Negative28.6%

User reviews

BUNKR Secure Messaging & Vault

From 112 App Store ratings

What we love

  • 🔒 Excellent security and privacy
  • 👍 Easy to use and navigate
  • 📂 Organizes documents and files effectively
  • 🔑 Secure password management
  • 💬 Secure messaging feature

Room to improve

  • 🐛 Glitchy and crashes during photo backup
  • 🐛 Account creation errors and locked accounts
  • 🐛 Slow customer support response
  • ⚠️ Lack of integration with iOS ecosystem

Tuta Calendar

From 165 App Store ratings

What we love

  • 🔒 Privacy and security focused
  • 👍 Streamlined and minimalist design
  • 🔄 Calendar subscriptions work well
  • ✨ Good color schemes and views
  • ✅ Private alternative to big tech

Room to improve

  • 🐛 Frequent crashes and bugs
  • ⚠️ Requires account/login
  • 📅 Widget not working/limited
  • ❌ No watch app support
  • ⏳ Slow loading/reloading events

Bugs and requests

BUNKR Secure Messaging & Vault

Reported bugs

3 issues
  • Cannot back up photos without glitching/crashing
  • Account creation errors, locked accounts, and delayed wait times
  • Customer support was unaware of issues and suggested fixes not implemented

Requested features

3 requests
  • Improve photo backup stability
  • Faster customer support response
  • Better integration with iOS ecosystem

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

In-app purchases

4 purchases

BUNKR Secure Messaging & Vault

Subscriptions4
  • Pro Access1 Month trial$29.991 Year
  • Full Access$39.991 Year
  • Pro Access6 variants$39.991 Year
Show 1 more
  • Pro Access1 Month trial$39.991 Year
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

Questions

Is BUNKR Secure Messaging & Vault free?
BUNKR Secure Messaging & Vault is free to download, with in-app purchases available.
Is Tuta Calendar free?
Tuta Calendar is free to download, with in-app purchases available.
Which has better reviews, BUNKR Secure Messaging & Vault or Tuta Calendar?
BUNKR Secure Messaging & Vault is rated higher. BUNKR Secure Messaging & Vault averages 4.9 out of 5 from 112 ratings, while Tuta Calendar averages 4.6 from 165 ratings.
Do BUNKR Secure Messaging & Vault or Tuta Calendar have ads?
Neither BUNKR Secure Messaging & Vault nor Tuta Calendar shows ads.
Which is updated more often, BUNKR Secure Messaging & Vault or Tuta Calendar?
BUNKR Secure Messaging & Vault ships an update every 3 weeks, and Tuta Calendar weekly. Most recently, BUNKR Secure Messaging & Vault was updated on November 3, 2026 and Tuta Calendar on November 5, 2026.

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