Comparison

HEY Calendar vs SitzProbe

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

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
Read full description

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

About

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.

Highlights
  • Task management with details
  • Intelligent practice scheduling
  • Progress tracking and analytics
  • Offline functionality
  • iCloud synchronization
Features
Read full description

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

HEY Calendar4 screens
SitzProbe4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

HEY Calendar ships an update fortnightly, SitzProbe every 3 weeks. The most recent releases landed on October 14, 2026 and October 1, 2026 respectively.

Scorecard4 real differences · 6 level
HEY Calendar versus SitzProbe: the parameters behind the verdict, then further details
ParameterHEY CalendarSitzProbe
PriceFreeFree
Rating4.7 (655 ratings)5.0 (1 ratings) — better
Positive reviews56.4% of reviews—
Number of ratings655 — better1
Update frequencyFortnightly — betterEvery 3 weeks
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.217.0 — better
Further details — not scored
Size64 MB15 MB
Age rating4+4+
Developer37Signals LLCJoseph Anderson

Customer experience

HEY Calendar

All ratings655 ratings
Positive90.1%
Neutral5.3%
Negative4.6%
Written reviews110 reviews
Positive56.4%
Neutral15.5%
Negative28.2%

SitzProbe

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

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

None

HEY Calendar

No in-app purchases

2 purchases

SitzProbe

Subscriptions2
  • Pro Monthly$0.991 Month
  • Pro Yearly$5.991 Year

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 14, 2026 and SitzProbe on October 1, 2026.

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