Jain scriptures are mainly written in Prakrit languages, especially Ardhamagadhi. Here’s a simple overview:

• Primary sacred texts (Agamas) – mostly in Ardhamagadhi Prakrit (Svetambara tradition) and in other Prakrits.
• Other canonical and later works – often in Sanskrit.
• Some later or commentarial literature – may be in Prakrit or Apabhramsha (a vernacular form that evolved from Prakrit).

So, the core scriptures are Prakrit (Ardhamagadhi), with Sanskrit used for many later texts and commentaries.