# One Calendar — user reviews > 826 indexed App Store user reviews of One Calendar by Code Spark, rated 4.80/5 from 20,539 ratings. - Source: https://appshunter.io/ios/app/one-calendar/id1238379385/reviews - App overview in markdown: https://appshunter.io/ios/app/one-calendar/id1238379385.md - Rating breakdown: 5★ 16,937 · 4★ 2,660 · 3★ 663 · 2★ 130 · 1★ 149 ## What do users think of One Calendar? Overall sentiment: positive **Pros** - 🚀 Easy to use - 👍 Clean and simple interface - 👍 Integrates multiple calendars - 🚀 Syncs across devices - 👍 Customizable colors and themes - 👍 Helpful for organizing schedules **Cons** - 🐛 Syncing issues - 🐛 Bugs and glitches - 🔒 Lacks security features - 🔋 Drains battery - 👎 Restrictive features in free version **Commonly reported bugs** - Sync errors - Unresponsive buttons - Incorrect time zone display - Duplicate events - Inability to delete future occurrences of recurring events **Most requested features** - Multiple reminders for events - Ability to edit recurring events - Option to change event calendar after creation - Printing support - More customization options - Widgets for better visibility ## Newest reviews (16 of 826) ### 3/5 — Have to pay for Premium for each device *2026-08-11, version 6.910.3* This is the first app I’ve used that wants you to pay for each device you want to use the Premium version either Android or Apple. It would be nice to pay once and use on both iPhone and iPad. I haven’t tried adding new events, but it at least got my multiple calendars displayed correctly from the start. I hope there will be an option to change the widget theme soon. ### 3/5 — NOT Fair, free for Mac $5.99 for iOS.. *2026-06-28, version 6.901.0* This seems like a nice capable calendar app but there is no capability to easily transfer your account access from one platform to another, you have to manually enter access codes, not a show stopper but annoying.. When I started working this on MAC, I liked it. Little did I know that when I wanted to use it on my iPhone it’s free to download but there are some very necessary features that you have to pay for like changing calendar colors (if you have more than one persons calendar displayed). ### 4/5 — Hate that they always ask for a review *2026-06-24, version 6.901.0* Above reasons ### 4/5 — Just missing widgets *2026-05-28, version 6.901.0* Great app but I can’t find any widgets for my MacBook. ### 4/5 — Some widget stopped working *2026-05-28, version 6.901.0* I have a paid subscription since I really like this calendar. For some reason, the widgets don’t always work. I have tried to delete it restart my phone reloaded it and synced it but it’s still happening. Other than that, it’s a great app. ### 4/5 — Like it *2026-05-18, version 6.901.0* The features I love about this is that we’re able to sync our older calendars, use across our family, etc. etc. Love. What I wish it had was a button for “Today” to take us back quickly (like iCal). ### 4/5 — Basically perfect. *2026-04-13, version 6.901.0* Only problem I have is that I payed for pro and now the widget absolutely WILL NOT reload. I have never had this problem before. Still a great app, I hope they fix the widget. ### 3/5 — Need to fix latest update *2026-02-25, version 6.901.0* Minor bugs on interactive interface need to be fixed. Invites tab also disappears after some time. Need to quit and re-open to bring it back. ### 3/5 — Used to be better *2026-02-14, version 6.901.0* The App has changed you used to be able to drag and drop the appointments about this was much better and also there used to be a smaller calendar in the top corner. ### 3/5 — Needs minor improvement *2026-02-12, version 6.901.0* I have this app on Android as well and on Android there is the ability to scroll thru months and lists on the widgets. I miss this feature and have stopped using this on ios. I started using Across instead to take advantage of more flexibility in the widgets. I also like seeing the list for each day while still in calendar view in the app. I did pay for premium and do feel the price is fair for this app but coming from Android I just missed the customization of the widgets which is why I purchased this app originally. I am hoping this may come soon in an update. ### 3/5 — Please fix this bug *2026-02-06, version 6.901.0* I tried repeating an event but when i create it for some reason shifts the whole thing one day back?? ### 5/5 — Phenomenal *2026-02-06, version 6.901.0* I love this calendar! It’s simply formatted, easy to navigate and I have an HP laptop, apple iPad and an iPhone and the calendar is synced online to all of them so it doesn’t matter where I’m at or what I’m doing I can put something in whichever devise I’m on any time of the day. Works great highly recommend 🙏🏼 ### 5/5 — GREAT APP *2026-01-27, version 6.901.0* only one that really syncs across outlook and gmail seemlessly. ### 4/5 — Data *2026-01-20, version 6.901.0* More flexibility how interaction is made with Copilot ### 4/5 — 결재했는데 아이폰에서 확인이 안되요 *2026-01-20, version 6.901.0* 아이폰에서 결재확인 해주세요 ### 5/5 — The great unifier! *2026-01-19, version 6.901.0* I’ve been using this since the late 2010’s and it’s really easy to use, and works GREAT! ## Most critical reviews (10 lowest-rated) ### 1/5 — Misleading Features *2026-09-02, version 10.0.100* I paid for premium badges on advertised features. Those features aren’t there. Now no reply from customer support. I want my money back! ### 1/5 — Does not sync *2026-08-18, version 10.0.100* It will not sync with all of my calendars, though it says it does. This has caused me to miss important appointments. Do not waste your time on this calendar. ### 1/5 — Hard to connect *2026-03-11, version 6.901.0* Cannot connect to iCloud as it stated ### 1/5 — Terrible app. *2026-02-04, version 6.901.0* Not worth it. Don’t waste your money trying. There are better apps out there for free ### 1/5 — ERRO EN EL MENU *2026-01-14, version 6.901.0* se bloquea el menu y no puedo abrir la configuración ni colocar una nueva cuenta ### 1/5 — Teleurgesteld *2025-10-10, version 6.6.5* Nadat app even weg was, terug moeten installeren en dan geen kleuren meer voor verschillende afspraken!! ### 1/5 — Please fix bug on latest update *2025-07-25, version 6.3.1* All my all-day events got disorganised! ### 1/5 — Quickly Deleted *2025-06-25, version 6.0.9* I downloaded this do I could add just one of my iPhone Calendars to it. The app insists on importing them all. No thanks! ### 1/5 — Buggy *2025-06-22, version 6.0.9* Constant sync problems. ### 1/5 — Error adding your iCloudDevice account: Arg_NullReferenceException *2025-05-22, version 6.0.3* I’ve put in the right credentials and it won’t let me get past this error message… I have tried deleting the app and restoring it to no avail. ## Most praised reviews (10 highest-rated) ### 5/5 — Simple. Helpful. *2026-07-21, version 6.910.3* I just needed everything in one place - one calendar does that and more. Worth a look! ### 5/5 — MUCH MORE VISUALLY PLEASING *2026-07-19, version 6.910.3* Much prefer this to Apples App. You can see more and it’s more customisable. ### 5/5 — Love It So Far *2026-06-07, version 6.901.0* I like this calendar a lot. Very easy to schedule appointments. ### 5/5 — Can't restore license *2026-05-25, version 6.901.0* I love this app I previously brought it but it won't let me restore its saying I have never purchased which I have... It's a good app but I need help please ### 5/5 — Five stair *2026-05-18, version 6.901.0* Five stair ### 5/5 — Easy to use *2026-05-07, version 6.901.0* Great calendar. Very clear. Better than any other calendar I have tried. It is my go to calendar. ### 5/5 — OneCalendar *2026-04-25, version 6.901.0* Hi ### 5/5 — Calendar *2026-03-23, version 6.901.0* Works well ### 5/5 — Nice Calendar *2026-03-03, version 6.901.0* Like this app and am trying to migrate all my devices to One Calendar. Apple are making this a bit difficult but it seems worth the effort ### 5/5 — Calendar *2026-02-26, version 6.901.0* I love everything colour coded. --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-12.*