When comparing Opera Mail vs Spark, the Slant community recommends Spark for most people. In the question“What are the best e-mail clients for macOS?” Spark is ranked 6th while Opera Mail is ranked 8th.
Ranked in these QuestionsQuestion Ranking
Pro Free and based on Mozilla code
Opera Mail is completely free to download and use and it is based on Mozilla's code, which is what makes it a bit similar to Thunderbird in looks and function.
Pro Intuitive user interface
The design of the UI in Opera Mail is clean and intuitive, making for an easy to use client.
Pro Opera Mail CAN BE set as default email client in Windows 8 & 10
Pro Automagic smart filtering
After a bit of use Opera learns what e-mail belongs in what folder just by previous usage. This makes for a convenient way to have e-mails filtered without having to manually mange every e-mail.
Pro Custom quick swipe features
Pro Free snooze options
Pro Robust customization options
Con Sync is slow
Opera tends to be slower on e-mail sync when compared to other popular clients.
Con Very limited feature set
Compared to Thunderbird.
Con Does not support 4K monitors
- Sends statistical data to several services known for bad privacy policies (Google, Facebook), also there's no way to opt out.
- Automatically creates an acount with the first address entered and subscribes you to their newsletter.
- Stores credentials for your email accounts on their servers.
- Stores your emails on their servers to push them to your devices.
- Server infrastructure seems to be located in the US.
Con Doesn't show the counts of emails next to the folders
- On the Mac platform will show +999 for the folder that contains more than 1000 emails.
- On the iPhone, the platform will not show the counts next to the folder unless they are new emails.
Con Doesn't support many services
Many services such as Spam filters, Pocket, and other apps are not supported.