When comparing Mutt vs Hiri, the Slant community recommends Mutt for most people. In the question“What are the best native e-mail clients for Linux?” Mutt is ranked 3rd while Hiri is ranked 12th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Terminal based
Pro Small and efficient
Pro Active development
Even though it was first released in 1995, Mutt still enjoys an active community following it and having new releases constantly.
Pro It runs inside the terminal
It doesn't display HTML email, fonts, or graphical elements.
Pro Compose mails in your favorite editor
Edit mails efficiently with an editor you already can work fluently with.
Pro Highly configurable macros
Pro Threads emails
Pro Work with regular expressions
Mails can be filtered, deleted, flagged, etc. with regular expressions which makes mail management very efficient.
Pro Simple and modern UI/UX design
Cons
Con Terminal-based
It runs inside the terminal so it doesn't display HTML email, fonts, or graphical elements.
Con Dead product
No release in well over a year, no support, and a permanent "never to be repeated" offer. This product is now looking like a con itself.
Con Not free
You have to subscribe to a paid plan to use it.
Con Cannot unsubscribe or cancel service
Cancellation requests go unanswered but the yearly invoices continue to arrive and credit card is charged.