What are some alternatives?
When comparing Landing Harbor and Landing Pages in MailChimp, you can also consider the following products
Landing Pages by Viral Loops - Easily create a landing page for your referral campaign ✌️
Carrd - Simple, responsive one-page site creator.
Generator by DesignModo - Easy way to make a landing page for your startup
SaaS Pages - 900+ Screenshots of the best SaaS landing pages
Ship - Fast, native issue tracking for software projects
The Landing Page Cookbook - A guide for makers who want to create better landing pages.