# Robot Mobile vs Tuta Calendar

The clearest difference is in-app purchases: Robot Mobile at none against Tuta Calendar's 4. Robot Mobile also leads on iOS requirement (13.0 vs 16.0). Tuta Calendar's advantage is update cadence (weekly vs every 5 months) and review sentiment (57% vs 33%). On price, ads and device support there is nothing between them.

Both are free to download. Tuta Calendar sells 4 in-app purchases, starting at $3.99 per month. Robot Mobile asks for nothing beyond the download.

Robot Mobile ships an update every 5 months, Tuta Calendar weekly. The most recent releases landed on October 7, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Robot Mobile | Tuta Calendar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (162 ratings)](https://appshunter.io/ios/app/tuta-calendar-secure-planner/id6657977811/reviews)** |
| Number of ratings | — | **162** |
| Positive reviews | 33.3% of reviews | **56.7% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Weekly** |
| Monetization | **Free** | Freemium |
| Size | 21 MB | 45 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Hetzner Online GmbH](https://appshunter.io/developer/482005454) | [Tutao GmbH](https://appshunter.io/developer/922429608) |

## What reviewers say

### Robot Mobile

[App page](https://appshunter.io/ios/app/robot-mobile/id482005451)

Manage your root servers and storage boxes remotely. Perform essential tasks like server resets, Wake-on-LAN, IP configuration, and traffic monitoring. Create, restore, and delete storage box snapshots.

**Highlights:** Server reset, Wake On LAN, Failover IP configuration, Traffic monitoring, Storage box snapshots

**Features:** macOS Compatibility

**In-app purchases:** none


### Tuta Calendar

[App page](https://appshunter.io/ios/app/tuta-calendar-secure-planner/id6657977811)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Revolutionary (Monthly) | $3.99 | per month |
| Legend (Monthly) | $9.99 | per month |
| Revolutionary (Yearly) | $39.99 | per year |
| Legend (Yearly) | $99.99 | per year |

**What reviewers like**

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

**What reviewers complain about**

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

**Reported bugs**

- 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

**Requested features**

- 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)


## Frequently asked questions

### Is Robot Mobile free?

Robot Mobile is free to download, with no in-app purchases.

### Is Tuta Calendar free?

Tuta Calendar is free to download, with in-app purchases available.

### Do Robot Mobile or Tuta Calendar have ads?

Neither Robot Mobile nor Tuta Calendar shows ads.

### Which is updated more often, Robot Mobile or Tuta Calendar?

Robot Mobile ships an update every 5 months, and Tuta Calendar weekly. Most recently, Robot Mobile was updated on October 7, 2026 and Tuta Calendar on October 21, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*