What are some alternatives?
When comparing LinkedBooster.app and Email on Acid, you can also consider the following products
Dux Soup - Dux-Soup is a lead generation tool for LinkedIn.
SendInBlue - Innovative online Email Marketing solution to manage your contacts, create & send your newsletters and track your results. More than 80 000 clients. Best prices and attractive features.
ProspectIn - ProspectIn is a Chrome extension to automate your LinkedIn
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Linked Helper - Linked Helper is a workflow automation tool for LinkedIn Sales Navigator and LinkedIn Recruiter.
Constant Contact - Constant Contact offers email marketing, social media marketing, online survey, event marketing, digital storefronts, and local deals tools.