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Calendar: what 84 low-star reviews complain about

We read 84 one-to-three-star reviews written between 2026-01-13 and 2026-09-08 and kept the ones that describe a specific unmet need. Grouped with reviews of other apps that say the same thing, they land in 9 repeated complaints. Store listing.

What reviewers complain about

• Unreliable data storage×2
• Zero data resilience
• Worsening spam problem
• Won't sync despite multiple attempts
• User receives no value while data is shared with unethical institutions
• Updates break google calendar sync
• Unreliable storage
• Unreliable search results
• Unreliable data storage forcing migration to competitors
• Unreliable cloud backup integration

The opportunities these reviews point to

1. 0181Calendar app with reliable data persistence and backups21 of 70
2. 0280Locked — subscribe to read this opportunity2 of 90
3. 0348Locked — subscribe to read this opportunity2 of 2
4. 0478Locked — subscribe to read this opportunity1 of 21
5. 0576Locked — subscribe to read this opportunity1 of 37
6. 0675Locked — subscribe to read this opportunity1 of 25
7. 0756Locked — subscribe to read this opportunity1 of 3
8. 0855Locked — subscribe to read this opportunity1 of 3
9. 0944Locked — subscribe to read this opportunity1 of 2

Score out of 100, then how many of the cluster's reviews are about this app out of its total. Category: Calendar.