# HEY Calendar vs SitzProbe

The clearest difference is in-app purchases: HEY Calendar at none against SitzProbe's 2. HEY Calendar also leads on ratings volume (655 vs 1). SitzProbe's advantage is rating (5.0 vs 4.7). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. SitzProbe sells 2 in-app purchases, starting at $0.99 per month. HEY Calendar asks for nothing beyond the download.

SitzProbe holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: HEY Calendar has 655 ratings behind it against 1, so its average is the more settled of the two.

HEY Calendar ships an update fortnightly, SitzProbe every 3 weeks. The most recent releases landed on October 19, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | HEY Calendar | SitzProbe |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (655 ratings)](https://appshunter.io/ios/app/hey-calendar/id6449716061/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sitzprobe/id6502870044/reviews)** |
| Number of ratings | **655** | 1 |
| Positive reviews | 56.4% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Monetization | **Free** | Freemium |
| Size | 64 MB | 15 MB |
| Requires iOS | 17.2 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [37Signals LLC](https://appshunter.io/developer/363576304) | [Joseph Anderson](https://appshunter.io/developer/1747143597) |

## What reviewers say

### HEY Calendar

[App page](https://appshunter.io/ios/app/hey-calendar/id6449716061)

This calendar app organizes your schedule around days and weeks, reflecting how people naturally think. It supports habits, highlights important events, and accommodates flexible scheduling for tasks that don't have a fixed time. Enjoy a full-featured experience with unique twists on conventional calendar functions.

**Highlights:** Weekly view focus, Habit tracking, Event highlighting, Flexible scheduling for 'maybe' tasks, Event countdowns, Day labels for context, Color-coded sub-calendars, Flexible reminders

**In-app purchases:** none

**What reviewers like**

- 🚀 Thoughtful and different approach
- 👍 Lovely UI
- 👍 Wonderful UI
- 👍 Innovative features like 'Sometime this Week'

**What reviewers complain about**

- 🐛 Buggy and unreliable syncing
- 🔍 Lacks integration with other calendars
- 🔍 Missing key features like month/year view and search
- 🔍 Clunky and unintuitive user experience

**Reported bugs**

- Events not showing up on calendar
- Notifications not working as expected
- Frequent crashes and performance issues
- Inability to edit events from external calendars

**Requested features**

- Two-way sync with other calendar services
- Ability to set custom recurrence patterns
- Integration with mapping/navigation apps
- Family/shared calendar support
- Calendar widget for quick access


### SitzProbe

[App page](https://appshunter.io/ios/app/sitzprobe/id6502870044)

This app uses spaced repetition to help you master any set of tasks. It intelligently schedules practice sessions based on your performance and tracks your progress over time. Your data is kept private and can sync across devices.

**Highlights:** Task management with details, Intelligent practice scheduling, Progress tracking and analytics, Offline functionality, iCloud synchronization

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $0.99 | per month |
| Pro Yearly | $5.99 | per year |


## Frequently asked questions

### Is HEY Calendar free?

HEY Calendar is free to download, with no in-app purchases.

### Is SitzProbe free?

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

### Which has better reviews, HEY Calendar or SitzProbe?

SitzProbe is rated higher. HEY Calendar averages 4.7 out of 5 from 655 ratings, while SitzProbe averages 5.0 from 1 ratings.

### Do HEY Calendar or SitzProbe have ads?

Neither HEY Calendar nor SitzProbe shows ads.

### Which is updated more often, HEY Calendar or SitzProbe?

HEY Calendar ships an update fortnightly, and SitzProbe every 3 weeks. Most recently, HEY Calendar was updated on October 19, 2026 and SitzProbe on October 1, 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.*