We analyzed 62 negative reviews from the top 5 Arduino Planner apps on the App Store. Here's what users hate most.
Ranked by frequency — how often each complaint appears in negative reviews.
29% of negative reviews mention this issue.
"Cannot stay synced and cannot cancel so out $24.95. Would be very nice if it worked across devices but syncing with iCloud mostly fails."
"I thought this would be a great app for me as I began to use it seen many many flaws that begin to arise one of the biggest ones is that it would not sink any of my tasks or calendars between my app on my watch or my phone and my tablet"
24% of negative reviews mention this issue.
"Be aware that this company will not respond to you even if the product does not work. Before paying the crazy fees they ask for be sure that you are willing to take a $50+ loss."
"I inquired about finding a solution to my meeting not appearing but after 20 days of no response I concluded they are not interested in supporting their application. Money wasted. Deleted."
21% of negative reviews mention this issue.
"I used Opus One years ago. But what in Sam Hill is worth $25 per year? You've got to be kidding!"
"Stole my money. Bought the Mac app and now they changed it to a subscription based app. They charge $2 a month for you to update and get more bugs."
18% of negative reviews mention this issue.
"I have used opus domini for over 6 years and have used opus one since its inception. Opus one is less than a lite version of Opus domini."
"Like everyone else has been waiting for this release. While I haven't had any problems syncing and I am not being charged extra having already bought the product for all my devices, I have found the mobile versions have been stripped of what they"
16% of negative reviews mention this issue.
"Great planner, but useless as I move between my iPad in the field to my PC in the office. Very shortsighted to ignore the PC market. I will not re-up my subscription, simply because there is not a synched version for the PC."
"I used their previous app extensively and love their FC integration unfortunately I don't use a Mac nor an iPad. It therefore makes little sense to pay for a subscription that would cover all 3 when I can only use my iPhone."
13% of negative reviews mention this issue.
"I have the 'free' version and it has lost my data 3 times since Jan 01, 2025. After it crashes, all my data was lost."
"The latest version just crashes instantly upon launch. Too bad, this was a beautiful app."
Design and usability issues driving negative reviews.
Users report needing to navigate through multiple screens and clicks to perform basic operations
"You have to click hundreds of times to do simple tasks in the app."
Users struggle to understand the relationship between Compass, Master Tasks, Goals, and other sections
"I want to like this app. I just wish there were better tutorials online that go beyond 'how to' and into the 'Why'. I don't get the difference between 'Compass', 'Master Tasks', 'Goals' etc. I feel like I have missed something"
Weather, colors, repeating tasks, and other configured features fail to work properly
"still cannot get Opus One to show the weather waiting to review until I can find out how to get weather to show..pd for subscription. anyone?"
Users report being unable to cancel subscriptions or being charged unexpectedly
"I was just trying to use the trial, and suddenly I'm subscribed for a year at $24.99! WTH? I just wanted to try it!!!"
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