HEY Calendar vs SitzProbe
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HEY Calendar
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.
- Weekly view focus
- Habit tracking
- Event highlighting
- Flexible scheduling for 'maybe' tasks
- Event countdowns
- Day labels for context
- Color-coded sub-calendars
- Flexible reminders
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Make your day. The all-new HEY Calendar puts time on your side. Week after week, not month after month People think in days and weeks, not months. What’s tomorrow? Later this week? Next week? The HEY Calendar is built around how you think, not how paper calendars were designed. Habits and highlights Establish a habit, stick with it. Circle important events so they stand out. Fill your days with memories or moments — not just events. “Sometime this week” mimics real life Need to get an oil change? Get some cash from the ATM? Write a thank you note? Maybe this week or next, just not exactly sure when you’ll have a chance? HEY knows “maybe” is a real thing. And plenty more The HEY Calendar is a full-featured calendar with many original twists on common — and not so common — conventions. Soon you’ll wonder why all calendars don’t work like this. - Set countdowns for anticipated events - Use Day Labels to add context to days - Set up color-coded sub-calendars - Flexible reminders so you don’t miss out
SitzProbe
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.
- Task management with details
- Intelligent practice scheduling
- Progress tracking and analytics
- Offline functionality
- iCloud synchronization
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SitzProbe is a spaced-repetition system to help you manage any multitude of tasks that need to be practiced. Over time, your repertoire will grow, and SitzProbe will remember what you practiced last, and when, and what you should practice next to keep on top of everything! - Manage your tasks: Quickly catalog your repertoire with composer, title, and difficulty level. Add notes and practice reminders. - Smarter practice schedule: The app intelligently schedules when to review each piece based on your performance and retention patterns. - Progress tracking: Monitor your improvement over time with detailed analytics and insights about your practice habits. - Offline functionality: SitzProbe keeps your data in your hands. Your data or behavior is never monitored or sold to third parties. - iCloud Sync: if you are signed into iCloud, your data can be automatically synced between all of your devices. Terms of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
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.
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. 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 14, 2026 and October 1, 2026 respectively.
| Parameter | HEY Calendar | SitzProbe |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (655 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 56.4% of reviews | — |
| Number of ratings | 655 — better | 1 |
| Update frequency | Fortnightly — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.2 | 17.0 — better |
| Further details — not scored | ||
| Size | 64 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | 37Signals LLC | Joseph Anderson |
Customer experience
HEY Calendar
SitzProbe
Bugs and requests
HEY Calendar
Reported bugs
4 issues- 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
5 requests- 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
Not enough reviews yet to summarise bugs or requests.
In-app purchases
HEY Calendar
No in-app purchases
SitzProbe
- Pro Monthly$0.991 Month
- Pro Yearly$5.991 Year









