When comparing GSAP vs animo.js, the Slant community recommends GSAP for most people. In the question“What are the best JavaScript animation frameworks or libraries?” GSAP is ranked 1st while animo.js is ranked 4th. The most important reason people chose GSAP is:
It's been around a long time, from back in Flash days.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Mature
It's been around a long time, from back in Flash days.
Pro Fast
It has always stressed performance.
Pro Lightweight
It's always stressed file size. There are different versions available to balance features and weight.
Pro Few dependencies
The only dependency Animo has is jQuery. The source also includes animate.css as a stylesheet, but you can always add yours if you wish to do so.
Pro You can get personal help from the development team by paying
The animo.js team offer the option to contact and get help personally from the dev team by paying an amount of money (2 days for $5 2 weeks for $30 Lifetime for $100).
Alternatively, being an open source project you can still open an issue and get help from other developers that use this library.
Pro Includes CSS animation library out of the box
Animo.js has a CSS animation library (animate.css) included by default, which provides developers with 60 pre-made CSS animations where they can choose from.
Pro Open source
Animo.js is a free and open source tool.
Cons
Con Development seems slow
From their Github repo it seems that development is going pretty slow. Issue reports are still getting answered but the latest commit to the master branch happened more than 6 months ago.