# Alto Shared Time Calendar vs MindStack

The clearest difference is in-app purchases: Alto Shared Time Calendar at none against MindStack's 3. Alto Shared Time Calendar also leads on ads (none vs shown) and update cadence (every 2 days vs fortnightly). MindStack's advantage is device support (3 vs 1) and iOS requirement (14.0 vs 18.0). On price there is nothing between them.

Both are free to download. MindStack sells 3 in-app purchases, starting at $2.99 per 7 days. Alto Shared Time Calendar asks for nothing beyond the download.

Alto Shared Time Calendar ships an update every 2 days, MindStack fortnightly. The most recent releases landed on September 19, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Alto Shared Time Calendar | MindStack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/alto-shared-time-calendar/id6670268848/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 2 days** | Fortnightly |
| Monetization | Free | — |
| Size | 3 MB | 27 MB |
| Requires iOS | 18.0 | **14.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [System Operator LLC](https://appshunter.io/developer/1847669767) | [DMITRIY IVANOV](https://appshunter.io/developer/1229890011) |

## What reviewers say

### Alto Shared Time Calendar

[App page](https://appshunter.io/ios/app/alto-shared-time-calendar/id6670268848)

Easily create a shared calendar that shows your availability as busy or free. Share this summary calendar with others to let them know when you're available, or view their availability to coordinate plans.

**Highlights:** Create summary Busy/Free calendar, Share availability with others, View others' availability, Integrates all your calendars, Coordinate plans easily

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### MindStack

[App page](https://appshunter.io/ios/app/mindstack-pass-coding-screen/id6754540526)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| NORA Sync – 1W | $2.99 | per 7 days |
| NORA Sync – 1M | $8.99 | per month |
| NORA Sync – 1W | $19.99 | per 3 months |


## Frequently asked questions

### Is Alto Shared Time Calendar free?

Alto Shared Time Calendar is free to download, with no in-app purchases.

### Is MindStack free?

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

### Do Alto Shared Time Calendar or MindStack have ads?

MindStack shows ads; Alto Shared Time Calendar does not.

### Which is updated more often, Alto Shared Time Calendar or MindStack?

Alto Shared Time Calendar ships an update every 2 days, and MindStack fortnightly. Most recently, Alto Shared Time Calendar was updated on September 19, 2026 and MindStack on September 22, 2026.

---

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