When comparing Spark vs GyazMail, the Slant community recommends Spark for most people. In the question“What are the best e-mail clients for macOS?” Spark is ranked 5th while GyazMail is ranked 6th.
Ranked in these QuestionsQuestion Ranking
Pro Custom quick swipe features
Pro Robust customization options
Pro Syncs across devices
Pro Unified inbox
Pro Free snooze options
Pro Long term support and development
Goichi Hirakawa, the main developer of GyazMail, has been committed to his project since 2003 and delivers updates regularly.
Pro Native Cocoa API based
GyazMail is a native macOS application, based on the Cocoa API.
Pro Mail sorting rules
The user can define complex mail sorting rules for incoming and outgoing mail.
Pro customizable fonts & colors
the mailbox view is very comfortable
Pro 64-bit support
As of v1.6
Pro Very good support for Asian languages
GyazMail is a Japanese product, so it has very good support for Asian languages.
Pro Supports older versions of macOS
GyazMail is available for all versions of Mac OS X / macOS starting with version 10.1
Pro Freely selectable hard line wrap
In GyazMail you can set a maximum number of characters per line. The program will wrap the lines using hard wrapping on sending. This feature is very useful for newsgroups that require a hard break after 72 characters.
Pro Supports a big variety of character encodings
Uses Oniguruma regular expression library, which is a very elaborate regular expression engine that supports a big variety of character encodings. This makes very much sense with e-mail, as in an e-mail theoretically any character encoding could be used. Because it is free software (BSD), written in C, very elaborate, stable and still actively maintained it is also used in Atom, Take Command Console, Tera Term, TextMate, Sublime Text, SubEthaEdit, and jq.
- 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 support many services
Many services such as Spam filters, Pocket, and other apps are not supported.
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.