Amplify (neé Desmos) builds great tools and manipulatives that are great for classroom use and curious play. Read more of the pedagogy behind these tools on Mathworlds. https://danmeyer.substack.com/
It looks like "Amplify Education, Inc" and "Desmos Studio" (Public Benefit Corporation) are separate entities.
The desmos website still shows that most of the Desmos "math tools" still exist under the Desmos name (graphing calculator, scientific calculator, four function, matrix, geometry, 3D), but that "Desmos Classroom" specifically has been renamed to "Amplify Classroom" [1].
The amplify usage guidelines [2] say that "Amplify does not own but partners with Desmos Studio, the maker of a suite of free math tools, including a graphing calculator used by over 75 million people around the world. (See desmos.com for more information.)"
As a sibling poster notes, the Desmos calculator and math tools spun out to Desmos Studio PBC, which has a bunch of great people – with the goal of ensuring those remain available to all and not tied to a single curriculum provider. The Desmos Classroom tools for social, interactive classroom instruction, and another bunch of great colleagues, are part of Amplify, which together with Polypad and other tooling, make up Amplify Classroom ( https://classroom.amplify.com ), powering terrific IMO math, science and English curricula.
It's been a lot of fun – and a lot of tricky work! – bringing all of these tools and humans together.
I'd be remiss if I didn't mention that we are hiring, including for Software Engineer, Analytics Engineer, Data Engineer, and AI Engineer positions at various levels :)
That team got acquired by Amplify, and eventually the "Desmos Classroom" tool used to make the activities got acquired by Amplify too, leaving Desmos with just the more consumer-focused graphing calculator stuff. Amplify also acquired this other "Polypad" product and kind of merged the two together into what's now called "Amplify Classroom".
I think Amplify is still selling/distributing a lot of the activities that were originally made by the Desmos people.
He wrote an article heavily criticizing Math Academy's approach here: https://open.substack.com/pub/danmeyer/p/it-is-fun-to-preten...
But there's no evidence that he's tested it with a student in the target market!
He does link to article by Michael Pershan, who did kick the tires, but again, he didn't use it as intended over any reasonable period of time.
Based on their credentials, both Dan and Michael are people you'd hope you could trust if you want to learn about how to teach your kid math. Dan did his PhD at Stanford (under Dr Boaler) and Michael has been a math teacher for years, and has written at least one good book on the topic.
But they each seem to have a knee jerk reaction to anything that hints that it might replace human teachers, or anything that's only useful to a subset of students.