EteSync vs Tuta Calendar
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
EteSync
Securely sync your contacts, calendars, and tasks across devices. This app provides a privacy-respecting synchronization solution with a full history of your data, allowing for restoration and access to past versions.
- Secure data synchronization
- Contacts, calendars, and tasks sync
- Privacy-respecting
- Open-source client and server
- Full data history and restore
- Easy to use setup
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EteSync is a secure and privacy respecting sync for contacts, calendars and tasks. With this application you can sync your EteSync data with your iOS device! In order to use this application you need to have an EteSync account, either on an existing server or your own (it's free and open source). Easy to Use =========== EteSync is very easy to use, you just put in your credentials and the app is ready to use. Secure & Open ============ EteSync is secure and respects your privacy. Don't believe us? You shouldn't, just verify yourself, both the client and server are open source. Full History ========= A full history of your data is saved in a change journal which means your data is never lost, even if deleted, and you can always restore, revert and access past versions of your data.
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.
- 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
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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
Verdict
The clearest difference is rating: Tuta Calendar at 4.6 against EteSync's 3.0. Tuta Calendar also leads on review sentiment (57% vs 20%) and update cadence (weekly vs every 3 weeks). EteSync's advantage is in-app purchases (none vs 4) and iOS requirement (10.0 vs 16.0). On price, ads and device support 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
Both are free to download. Tuta Calendar sells 4 in-app purchases, starting at $3.99 per month. EteSync asks for nothing beyond the download.
Tuta Calendar holds the better App Store score, 4.6 against 3.0. That said, the two scores are not equally well evidenced: Tuta Calendar has 162 ratings behind it against 20, so its average is the more settled of the two. Written reviews point the same way: 20% of EteSync's written reviews are positive against 57% of Tuta Calendar's.
EteSync ships an update every 3 weeks, Tuta Calendar weekly. The most recent releases landed on October 14, 2026 and October 21, 2026 respectively.
| Parameter | EteSync | Tuta Calendar |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (20 ratings) | 4.6 (162 ratings) — better |
| Positive reviews | 20.0% of reviews | 56.7% of reviews — better |
| Number of ratings | 20 | 162 — better |
| Update frequency | Every 3 weeks | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 10.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 45 MB | 45 MB |
| Age rating | 4+ | 4+ |
| Developer | EteSync Ltd | Tutao GmbH |
Customer experience
EteSync
Tuta Calendar
Bugs and requests
EteSync
Not enough reviews yet to summarise bugs or 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
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- 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)
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- 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
EteSync
No in-app purchases
Tuta Calendar
- Revolutionary (Monthly)$3.991 Month
- Legend (Monthly)$9.991 Month
- Revolutionary (Yearly)$39.991 Year
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- Legend (Yearly)$99.991 Year








