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Calendars: Schedule Planner: what 67 low-star reviews complain about

We read 67 one-to-three-star reviews written between 2025-12-27 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

• Will not abide by contract
• Vendor blame-shifting with no resolution
• Unsetting sync deletes all local calendar data
• Unreliable data storage causing risk of missed work
• Unreliable data persistence
• Ui glitches when entering events
• Transitioned from owned software to spam-heavy model
• Time/date fields jumping around
• Sync requires manual forcing
• Sync failures cause irreversible data loss

The opportunities these reviews point to

1. 0181Calendar app with reliable data persistence and backups11 of 70
2. 0280Locked — subscribe to read this opportunity9 of 90
3. 0378Locked — subscribe to read this opportunity5 of 21
4. 0481Locked — subscribe to read this opportunity3 of 199
5. 0555Locked — subscribe to read this opportunity2 of 3
6. 0676Locked — subscribe to read this opportunity1 of 37
7. 0775Locked — subscribe to read this opportunity1 of 75
8. 0874Locked — subscribe to read this opportunity1 of 8
9. 0952Locked — subscribe to read this opportunity1 of 3

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