Responsive Viewer vs Responsively

How do Responsive Viewer and Responsively compare? Here are the facts side by side: pricing, platforms, open-source status and what each one is for.

Directory details: Responsive Viewer and Responsively
Directory detail	Responsive Viewer	Responsively
What it is	Responsive Viewer previews, screenshots, annotates, and compares website layouts across multiple screen sizes.	Responsively App helps developers inspect responsive web designs in a browser built for device previews.
Website	responsiveviewer.org	responsively.app
Type	Online tool	Online tool
Topic	Developer Tools	Developer Tools
Pricing	Not confirmed	Not confirmed
Platforms	Browser extension, Web	Web
Open source	Not stated	Not stated
Language	English	English
Alternatives	24 alternatives	24 alternatives