Yes, both Writemail and ContentIn offer a Free Trial.
Pricing for Writemail Starts at $12/month whereas for ContentIn Starts at $15.85/month.
Writemail offers several advantages, including Increases email productivity, Personalization options, Stores user preferences locally, Privacy conscious, Polite and many more functionalities.
The cons of Writemail may include a Stores options in cookie, No database storage, Lacks offline capabilities, Limited personalization / customization. and No API for integration
ContentIn offers several advantages, including Specifically designed for LinkedIn, Content creation platform, Promotes quick content creation, Assists in personal branding, Offering both free and paid plans and many more functionalities.
The cons of ContentIn may include a Limited to LinkedIn content, No video or slideshow support, Limited free plan, No multi-account support. and No automatic multi-language translation