Verdict
The built-in Calendar is a solid default, but recent reviews show recurring complaints about alerts not firing and events not syncing across devices, which is a serious problem for a scheduling app.
Best for
An iPhone user who lives entirely in Apple's ecosystem and mainly needs a simple, no-frills calendar without cross-platform sync demands.
Dealbreaker
Multiple reviewers report notifications and reminders silently failing to trigger, and events not syncing correctly across devices, sometimes with lost events.
The facts.
Pulled from the App Store, not written by hand. unverified
Price
Free
In-app purchases
Unknown
Ads
Unknown
Platforms
iPhone, iPad
Rating
4.9★ (1,514,783)
Version
1.9
Last updated
Dec 12, 2025
Released
May 26, 2016
Attributes
Native app
Category
Productivity
What reviews consistently say.
Themes grouped from 100 App Store reviews. Source feed ›
Praised for
Notifications and reminders3 reviews
Complained about
Notifications and reminders12 reviews
Sync and multi-device7 reviews
Crashes and stability6 reviews
Import and export3 reviews
Where this comes from
12 of 100 recent reviews raised: Notifications and remindersApp Store reviews ›
7 of 100 recent reviews raised: Sync and multi-deviceApp Store reviews ›
6 of 100 recent reviews raised: Crashes and stabilityApp Store reviews ›
Listed at Free on the App StoreApp Store listing ›
Where we recommend it
The best calendar apps ›Calendar apps that are well rated and still maintained, with the reason you might not want each.
Alternatives with the same rule.
Every app here is rated 4.2 or better, has been updated in the last eighteen months, and has no significant number of reviewers reporting it broken. Price is not the rule on this list — some are free, some are not. Also with a catch.
Free · 4.8★ (398,538) · Updated Aug 31, 2026
Verdict. Cozi is a shared family calendar built around syncing schedules and reminders across multiple people's devices, which is what its reviewers actually praise. Some features, including importing an existing calendar, sit behind a paid tier, and a handful of users report freezing and list-sync glitches.
Best for. A parent coordinating school pickups, appointments, and shared to-do lists with a spouse across separate phones.
Dealbreaker. The free version carries ads and the paid Gold tier still won't let you import an existing calendar; a few users also report the app freezing or losing checklist items during use.
Free · 4.7★ (509,656) · Updated Sep 14, 2026
Verdict. Dayforce is a workplace HR/payroll app for clocking in, checking pay stubs, and viewing schedules, not a personal calendar app. Reviewers report crashes during punch-in, slow loading, and sync mismatches with the desktop version.
Best for. An employee whose company already uses Dayforce for timekeeping and payroll who needs to punch in, check pay stubs, or view a work schedule from a phone.
Dealbreaker. This isn't a general calendar app: reviewers describe crashes and freezing specifically during time clock punch-in, slow loading causing punch errors, and schedule/calendar data not syncing reliably with the desktop version.
Free · 4.9★ (195,300) · Updated Sep 11, 2026
Verdict. Square Appointments is built for booking and payments together, not just calendar viewing—reviewers praise the client-facing scheduling and automated reminders, but there's a real pattern of crashes, freezes during payment, and dark mode bugs.
Best for. A solo service provider, like a one-person barber or salon operator, who needs clients to self-book and pay in the same app and doesn't mind occasional glitches during a transaction.
Dealbreaker. Multiple reviewers report the app freezing specifically when taking client payment, plus dark mode rendering it nearly unusable and updates that have broken existing workflows.