Verithiathe honest score on any app
Updated July 2026 · real, multi-region App Store reviews
Head-to-head

Saturn Calendar vs One Calendar

Saturn Calendar 4.7★ · Free to download 45
Winner One Calendar
One Calendar 4.8★ · Free to download 70

One Calendar is the better choice for general calendar needs due to its reliable syncing across multiple platforms and easier event management, while Saturn Calendar struggles with basic functionality and school-specific issues.

Full reviews: Saturn Calendar · One Calendar

Saturn Calendar is designed for high school students but is plagued by bugs, missing school data, and login issues, making it unreliable. One Calendar offers robust cross-platform syncing and general calendar features, though it has some UI and widget inconsistencies.

Head to head

Features edge: One CalendarR3R11R16R20
Saturn Calendar Saturn Calendar aims to be a school-specific scheduler, helping students track classes and connect with classmates R11. However, users frequently report missing schools, inability to add specific classes, and issues with the AI scheduling tool R3R16. Some users appreciated the removal of the AI tool R20. There are requests for features like widgets and the ability to add personal events .
One Calendar One Calendar excels at syncing across various platforms like Google, Apple, and Outlook calendars R80R83R95. Users appreciate its ability to consolidate multiple calendars into one view R95. However, it lacks some customization options like extensive color coding for events and a dedicated 'Today' button . Users also desire recurring event functionality R92R103R108 and a task list area .
Ease of Use edge: One CalendarR1R2R5R6
Saturn Calendar Saturn Calendar users face significant hurdles, including difficulty logging in due to missing class years R1R2R5R7 or verification code issues R6. The app is often described as glitchy and slow, with schedules disappearing or showing incorrect information R9R23. Manual schedule input is difficult or not possible, and the AI tool is buggy .
One Calendar One Calendar is generally praised for being easy to use and navigate . However, some users find it hard to connect to iCloud or other calendars R76. There are complaints about the inability to move events between calendars and the lack of a search option on iOS . Widgets can be unreliable and stop working .
Reliability edge: One CalendarR9R12R13R18
Saturn Calendar Saturn Calendar suffers from significant reliability issues, including frequent glitches, schedules disappearing or being incorrect, and the app randomly logging users out R9R23. Updates often break functionality or prevent users with older phones from accessing the app R12R13R18.
One Calendar One Calendar is generally considered reliable for syncing across devices R80R95. However, some users report issues with widgets not reloading , events shifting days after repeating , and the app constantly desyncing or requiring re-authentication . Some updates have introduced bugs or broken connections .
Price/Value tieR1R3R6R7
Saturn Calendar Saturn Calendar is free to download, but users encounter issues that diminish its value, such as not being able to access features due to school or class year limitations R1R3R7R14 or technical bugs R6R12R13R15. Some users feel it's not worth the frustration despite being free R15.
One Calendar One Calendar is free to download but requires payment for premium features like color-coding events . Users are frustrated by being charged without subscribing or having difficulty downgrading . The price for premium is $5.99 , but some users feel it's not worth it if the features don't meet their needs R103. There are also complaints about being prompted to rate the app excessively .
Support tieR15R23R76R85
Saturn Calendar Saturn Calendar users report poor or non-existent support, with issues like schedules disappearing and needing to constantly call support R23. One user mentioned support being 'almost just as good as steam support' R23. There are also issues with account activation taking days R15.
One Calendar One Calendar's support is criticized for being unhelpful, sending irrelevant solutions, or not responding at all R76. Users have reported issues with authentication codes not being sent R85 and lack of response regarding printing issues .
Pick Saturn Calendar if

You are a high school student looking for a social calendar specifically for school schedules and are willing to tolerate significant bugs and missing features R11.

Pick One Calendar if

You need a calendar app that reliably syncs events across multiple platforms (Google, Apple, Outlook) and devices, and you prioritize ease of use for general scheduling R80R83R95R104.

Evidence note: Reviews for Saturn Calendar are heavily skewed towards recent negative experiences, particularly concerning updates and missing features, despite a higher lifetime rating. Many positive reviews are short and unspecific. One Calendar has a more balanced mix of positive and negative reviews, with specific complaints about premium features and widget reliability.

Frequently asked

Does Saturn Calendar support all high schools?
No, many users report that their specific high schools are not available or that the app does not support their class year, such as the class of 2030 R1R3R7R14.
Can I sync my existing calendars with One Calendar?
Yes, One Calendar is highly praised for its ability to seamlessly sync with various existing calendars, including Google, Apple, and Microsoft Outlook, across multiple devices R80R83R95R104.
Are there recurring events in One Calendar?
Users frequently complain that One Calendar lacks an easy way to set up recurring events, often requiring manual re-entry or workarounds R92R103R108.
Does Saturn Calendar work on older iPhones?
Recent updates to Saturn Calendar have made it inaccessible for users with older iPhone models (like the iPhone X), as it requires an update that is not compatible with their device R12R13R18.

What reviewers actually said

Built only from these 120 real reviews (foreign ones translated). Superscripts jump to the quote here. Apple has no per-review links, so [ref] opens that app's reviews on the App Store.

  1. [R3] Saturn Calendar 3/5 · US Good app Please Add Crocus Plains,Vincent Massey And Neelin Highschools from brandon mb: Please add those schools
  2. [R11] Saturn Calendar 4/5 · US Cutie Patootie!: Super cute app for when i started high school! Though, when I pressed a button to “invite” someone to the app, it sent them like a text of my schedule which i didn’t expect, but it lowkey makes sense so that’s nothing to bad lol. Thanks for this app, it’s very nice and knows ur schedule very well!
  3. [R16] Saturn Calendar 1/5 · US .: I can’t find my school
  4. [R20] Saturn Calendar 5/5 · US Thanks for removing ai: Thanks for removing the ai (Ringo). Not everything needs ai and it’s a waste of money and energy
  5. [R1] Saturn Calendar 1/5 · US No new years: I am trying to login to see who is in my class next year but they don’t have the 2030 option so i can’t login could be a better app if they were on top of things
  6. [R2] Saturn Calendar 5/5 · US Class of 2030: Nice app! I just want class of 2030 to be added
  7. [R5] Saturn Calendar 5/5 · US ADD CLASS OF 2030!!: can u please add class of 2030? we are freshman now😭
  8. [R6] Saturn Calendar 3/5 · US Terrible update: saturn was working just fine until a few months ago it had an update and it asks my phone number for a verification code there is no code whatsoever please fix igttg
  9. [R9] Saturn Calendar 3/5 · US Regarding an issue with the class schedules: I just want to say that days when I have classes will say it is a free day or no school. This is totally incorrect and when I try changing the schedule, it just stays loading saying it is “finishing things up” or “finalizing your schedule” making me stuck with the stupid alien. (Y’all know what I’m talking about) I just ask that you take a look into thi
  10. [R12] Saturn Calendar 3/5 · US Update: So i got the app, but i genuinely cant go into the app anymore because i don't have to the new phone version it wants me to update too.
  11. [R13] Saturn Calendar 1/5 · US Saturn should be accessible for all: I was able to access Saturn before the “new update” occurred, and now I am unable to use it because it requires an update that only accommodates newer iPhones. Mine is an X and I can no longer use Saturn because it opens at a screen that says to update, with a button that leads to the app store, where it kindly informs me that I’m unable to update the app becau
  12. [R18] Saturn Calendar 3/5 · US Update: Love the app but i can’t update it because of my phone yet every time i want to use the app it tells me to update it and doesn’t let me view anything so I’m stuck only a screen of saying to update and nothing else since it wont let me keep the older version ??
  13. [R7] Saturn Calendar 1/5 · US Can’t use: I am class of 2030 when will this update
  14. [R15] Saturn Calendar 3/5 · US uh: so saturn is really fun when you actually get your profile activated! they don’t let you get the profile activated with ai but they need humans to check in, but they take 2-3 days to even see you. i found it infuriating because my app kept glitching and logging me out and then by the time my account was activated i had to delete my account 5 times…. would not recommend
  15. [R23] Saturn Calendar 4/5 · US Error in calendar: The calendar is very simple while also being very useful for my school, but for some reason around every 2 months, all my classes disappear and tell me that I need to set my schedule again. So I constantly call support (which is probably almost just as good as steam support) to get my schedule back the way it was. Overall , the Saturn calendar is amazing, but I would like the sc
  16. [R76] One Calendar 2/5 · US Not what I would use indefinitely: It's a functional app and can do what I need it to, except sync to my iCal. I have deleted the accounts and readded, but still there is no syncing. I didn't mind paying for the app when it was working as the price was reasonable for what the app offered. Forget about support helping. They have been of no help and send solutions for issues that do not pertain to s
  17. [R85] One Calendar 1/5 · US Won’t authenticate: I’ve wasted a good 30 minutes… The app will not send a code to my galaxy S 22+. I tried another option of sending to my galaxy S9 plus. I requested eight different codes be sent to two different devices and it just will not send the code to authenticate. This was a total waste of time, don’t bother. Now my Google account is flashing all kinds of security risks and blocking my a
  18. [R14] Saturn Calendar 4/5 · US 2030: i can’t become class of 2030
  19. [R80] One Calendar 5/5 · US Phenomenal: 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 🙏🏼
  20. [R83] One Calendar 5/5 · US GREAT APP: only one that really syncs across outlook and gmail seemlessly.
  21. [R95] One Calendar 5/5 · US For me and spouse: One of us has iCalendar the other has Google calendar and this allows us to work with each other’s calendars in one place. Works really well so far. Very much appreciated.
  22. [R104] One Calendar 5/5 · US Great Cross-Platform Calendar: My wife and I have used this as our family calendar for years. It works great and syncs perfectly across our Macs, iOS devices, and Windows PCs. It pulls the info from our shared Google calendar and displays everything on all our devices. We LOVE it!
  23. [R92] One Calendar 4/5 · US I like it: I like it, the only thing I wish it had was recurring events
  24. [R103] One Calendar 1/5 · US Horrible app: I paid for this app and I regret it. I cannot make an event repeat. Seriously? I spent over 30 minutes trying to do an elementary, common task, and it isn't possible. Why would any app that professes to be a calendar app not make recurring events an easy thing to set up like literally ever other calendar app out there???? And, if you have a pc and an iPhone, get ready to pay double.
  25. [R108] One Calendar 3/5 · US Create repeat button. 😮‍💨: I hate that I can’t repeat certain events and I have to write it down for each class.

Synthesized from 120 recent App Store reviews · updated July 2026 · View on the App Store