I'm a consultant. I have 4 different google calendar accounts w/ different companies. The specific issue I needed to solve was that when I put something on one calendar, I needed it to block all of the other calendars. This seamlessly and effortlessly makes that possible. I've used it for 2-3 years now and it's perfect. Review collected by and hosted on G2.com.

Very occasionally, you have to jump in and give it a nudge by manually re-running the sync. But that's like once every several months, and not a burden for the value I get in all of the other time that it is automated. Review collected by and hosted on G2.com.

The user interface is intuitive and clean, setup is easy and there's little to no maintenance needed. I didn't read a single support article because it all just ... makes sense to set up. It offers a variety of options in configuring the sync so that you share only what you want. The syncs are fast and it stays up-to-date in realtime. I love the booking links and the public calendar and ICS features. I have 9 calendars to manage and it has saved my life. It's made it so easy for colleagues and clients to see my actual availability and schedule with me without needing to share my calendars directly with one another. It's a perfect solution to my problem. Review collected by and hosted on G2.com.

I'd like to see the ability to add more than 8 calendars and I'd love more integration options. For example, I'd like to use my notetaker across all my calendars. I'd really like the ability to mark events on specific calendars as billable and see the totals for the week. Review collected by and hosted on G2.com.

I think it's great that OneCal keeps track of my appointments, especially since I manage multiple companies and accordingly multiple email accounts and calendars. It offers simple ways to synchronize the different calendars, which allows me to keep everything in view. I particularly like the booking page, which makes it a perfect place to manage everything related to my appointments. The initial setup process was super easy, as I could sign in with Gmail, for example, and the synchronization of the calendars is explained very clearly. In combination with Google and Outlook calendars, OneCal works perfectly to synchronize everything. Review collected by and hosted on G2.com.

The only thing I would personally like is for the app to allow setting the appointment to private. Review collected by and hosted on G2.com.

I work with multiple clients, and it has always been a challenge coordinating availability. While booking pages work well, they require my clients to remember that I (1) have a booking page and that (2) my availability in their internal system isn't reflective of my actual availability. Those hurdles lead to people just scheduling a time on an open slot, which causes conflicts.

OneCal solves this in the simplest way possible: By copying my calendar entries across my calendars, everyone gets to see my actual availability in the system they are already using. OneCal's booking feature handles availability for anyone who isn't part of an organization I'm already working with, fully covering my use cases.

OneCal allows you to select the level of information you share, which allows me to prevent clients' information from being shared with other clients. It's a great system and has already saved me hours of time by not having to reschedule meetings. Review collected by and hosted on G2.com.

Updated May 2026: While neither of these features has been added, I've found that I haven't used them enough in Calendly to justify the extra service. I've fully replaced Calendly with OneCal.

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As of August 2025, OneCal's booking feature isn't as mature as competitor products. It isn't the core feature of OneCal, so it doesn't make me any less likely to recommend OneCal. Specific features the booking feature lacks: Ability to limit the number of an events scheduled on a day (e.g., I can only schedule one off-site meeting per day) and creating one-off meeting links with custom availability. I expect these features to mature over time, but I haven't been able to 100% replace my Calendly subscription just yet. Review collected by and hosted on G2.com.

I primarily utilize OneCal to keep multiple calendars synced so that different organizations can see my shared schedule. Traditional calendar sharing will not allow other users to see exterior calendars making it nearly impossible to reschedule meetings without manually checking.

This one tool helps me manage tons of calendars effectively and my coworkers, clients, and companies can all keep track of my schedule in real-time as opposed to having to have me constantly backtracking on meetings. Review collected by and hosted on G2.com.

Overall there isn't a lot to dislike about OneCal. I think they could have a slightly better price scaling or segment there capabilities for users that care more about calendar sync versus booking links, etc.

They are also still a bit new from my persepective, but do have a solid platform and the growth I've seen so far gives me a great impression they will have a great continuous development cycle that will make this application one of the best for calendar management in the near future. Review collected by and hosted on G2.com.

OneCal is easily the best tool for cloning appointments across multiple calendars. I manage so many client calendars that it’s way too time-consuming to copy everything manually. With OneCal, I can automatically clone appointments and use my Teams/Office integration so meetings get scheduled appropriately and automatically. It’s not the cheapest tool in the industry, but in my experience it’s definitely the best. The also have a Discord group with the developers if you ever have UI / UX suggestions or need more direct support. Review collected by and hosted on G2.com.

I have not had any issues with OneCal. SOMETIMES the syncing goes slowly, but you can log into the portal and "Re-Run" and everything gets cleaned up. Review collected by and hosted on G2.com.

Really intuitive and simple interface - it takes a few minutes to set up, and then just runs in the background while you get on with your life. I haven't really had to think about it since I signed up more than a year ago, which is a good thing. Review collected by and hosted on G2.com.

I stopped recieving 2 step verification emails from OneCal because my email provider had marked them as spam. This was confusing, and I needed to reach out to OneCal to "whitelist" my own email again - seems like something that should be ironed out between OneCal and major email providers. Review collected by and hosted on G2.com.

I'm a freelancer and typically have 2-3 clients at a time. They set me up with accounts on their systems which means I easily have 4-5 calendars between theirs and my own calendars. OneCal is the only way to keep everything in sync and show true availability. It's a lifesaver for running a business like mine.

Set up is fairly easy; I like the booking flows and ability to customize reminder emails etc. Review collected by and hosted on G2.com.

Pricing is a bit high imo, which is the only drawback. Enough that I tend to evaluate every once in a while if there's another way to get the same outcome.

One thing I wish they had: when an engagement is over and I cut off the sync to that client I completely lose that entire calendar. It's just wiped. So I have no record of my meetings etc which I use often when I need to figure out a mysterious charge or something (eg oh that's a fee for parking when I was at client XYZ).

Other than that, I do think it's worth it, especially if you're wrangling a lot of calendars like me. Review collected by and hosted on G2.com.

I love OneCal for its ability to remove the chaos of scheduling across different time zones and schedules. By simply sending a link, people can book meetings with me, which eliminates double booking issues and keeps everything in sync. I appreciate how it organizes both my personal and professional life, preventing me from missing important events like my kid's preschool graduation. The ease of use has significantly reduced my stress. OneCal integrates seamlessly with my calendar and blocks off unavailable times automatically. It syncs perfectly with my Mac, and setting it up was a breeze, taking only ten minutes. The integration with the Google ecosystem and the ability to use it within emails is amazing, giving recipients an easy way to book time with me. Highly recommended, especially for those coordinating with others across various locations. Review collected by and hosted on G2.com.

Nothing, it is great! I know I am supposed to have some criticism but I have had no issues. Review collected by and hosted on G2.com.

I really appreciate how OneCal solves my need to have all of my calendars synced, so I'm not double booking time on my calendar. It's super easy to set up, and I found the user interface very nice to work with. Once I signed up, I had everything syncing in just a few minutes. I also like how, even after I've changed my setup a few times, it quickly removes the old sync events and creates the new ones. It was very easy for me to get up and running in 10-15 minutes. I also love that I can sync more than five calendars across personal and several businesses. Based on my experience, I've already recommended it to others. Review collected by and hosted on G2.com.

A few suggestions: Allow for multiple calendar 2-way syncs with different colors for each calendar's events. Currently, it shows all synced events as one color, which makes it hard to decipher what event is for which calendar. There is a workaround, but it makes for more one-way syncs. I'd also suggest a pricing model where you pay per calendar. I'm currently on the tier for 5 calendars, but need 6. Going to 6, the price jumps substantially. Review collected by and hosted on G2.com.