Amethyst for Android doesn[SQ]t exist as a single, widely known app. There[SQ]s no major app on the Google Play Store or other reputable Android app stores with that name that[SQ]s a standalone product.

It[SQ]s possible that :

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It[SQ]s a very niche or newly released app:

If it[SQ]s a small, independent app, it might not have gained widespread popularity yet.
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It[SQ]s a custom app or internal app:

The app might be developed for a specific company or individual and not publicly available.
*

The name is slightly different:

There might be a similar app with a slightly different name.
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You[SQ]re misremembering the name:

It[SQ]s easy to misremember app names.

If you can provide more context, like what the app is supposed to *do*, I might be able to help you find it or identify a similar alternative.