The toolbar was and continues to be available to all AMP customers, whether or not they have purchased an Alchemy license.
In mid- and late-2016, browser updates and security updates to AMP caused the AMP Toolbar for Internet Explorer and AMP Toolbar for Firefox to stop working. As a result, customers have been encouraged to switch to using the "Alchemy toolbars" for testing. It became clear that using the "Alchemy" name on the toolbar was causing confusion on the part of users, so a rebranding of the toolbar was kicked off in December 2016.
Introducing ACCESS Assistant
All AMP customers have free access to the ACCESS Assistant toolbars, and they can use them to test their websites and applications for accessibility compliance in context, directly within the browser. Testing data from the toolbars is saved to the customer's AMP instance, allowing all testing to be consolidated into a single set of projects and reports.
Alchemy: What is it Anyway?
So, what is Alchemy then and what's included? Alchemy is an SSB-licensed product that allows organizations to specify remediations for some of the highest priority and most commonly-found accessibility issues through an easy-to-use user interface. The organization must place a single Alchemy script tag on every page within their website or application. When end users access any page that has this script, the script checks the organization's AMP instance for available remediations and overlays them on the page, instantly improving the accessibility of the page.
Alchemy remediations require purchase of an Alchemy license. If the customer has purchased an Alchemy license they will see the "Alchemy" section in the Toolbox tab in AMP, where they can copy the script to place on the pages of their website. These customers will, like all other AMP customers, also have access to the ACCESS Assistant toolbars for testing and remediation specification purposes.