When comparing Squarespace vs Instapage, the Slant community recommends Squarespace for most people. In the question“What are the best WYSIWYG website builders?” Squarespace is ranked 2nd while Instapage is ranked 7th. The most important reason people chose Squarespace is:
Squarespace's WYSIWYG tools are intuitive and support drag & drop functionality allowing you to change existing layout or add an article quickly.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Easy to customize & update
Squarespace's WYSIWYG tools are intuitive and support drag & drop functionality allowing you to change existing layout or add an article quickly.
Pro Responsive templates
Squarespace templates offer an optimal viewing experience depending on the width of the browser window so they will work and look great both on desktop and mobile devices.
Pro Lots of flexibility
Squarspace allows complete creative control over how you want your website to look and function. It can be a complete website.
Pro Extensive styling options
Pro Detailed real-time metrics
Squarspace offers detailed metrics, that can also easily be accessed from your phone via an iOS app.
Pro Attention to detail
Squarespace has a bunch of small nice-to-haves that make it a pleasure to use, like automatically getting a screengrab when adding a video so that the site doesn't load the whole video before the user has clicked on it, or a sign-up process that's sane among other things.
Pro Lots of good example projects
Squarespace offers a great selection of highly polished templates across a variety of categories and styles.
Pro Great support
Squarespace promises to answer all question within an hour.

Pro Mobile-friendly
The auto-mobile feature means that any page you build, will automatically be viewable on any mobile device automatically.

Pro Easy to get started
There are three easy ways to get started. You can use the drag and drop editor to build your own page from scratch or customize a template. You can also import current web pages and edit them in the drag and drop builder.

Pro 100+ templates
There are over 100 ready to go templates for lead generation, webinar registration, mobile apps, and thank you pages. There are new templates constantly added as well.

Pro Built-in tools for A/B testing
Cons
Con Dependent on a third-party host
This is dependent on a third-party host, instead of creating a site that you can deploy on your own server.
Con Web-based, not a proper application
Con Limited to landing pages
Instapage focuses on creating simple, static lead generation and click through landing pages.
