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