What is the antonym for platform?

There isn't one single perfect antonym for "platform" because its meaning depends on the context. Here are some options depending on what you mean:

If you're referring to a physical platform:

* Ground level

* Floor

* Surface

* Base

* Foundation

If you're referring to a platform as a stage or a raised area:

* Floor

* Ground

* Stage level

If you're referring to a platform as a software or technology platform:

* Manual

* Standalone

* Isolated

* Independent

If you're referring to a platform as a set of beliefs or principles:

* Chaos

* Disorder

* Disunity

* Disagreement

* Inconsistency

To give you a more accurate antonym, please provide me with the context of how you are using the word "platform".