> For the complete documentation index, see [llms.txt](https://docs.holokit.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.holokit.io/product/concepts.md).

# Concepts

- [What's Stereoscopic AR?](https://docs.holokit.io/product/concepts/whats-stereoscopic-ar.md)
- [Mixed Reality Spectrum](https://docs.holokit.io/product/concepts/whats-stereoscopic-ar/mixed-reality-spectrum.md)
- [OST vs VST](https://docs.holokit.io/product/concepts/whats-stereoscopic-ar/ost-vs-vst.md)
- [Why We Design HoloKit X?](https://docs.holokit.io/product/concepts/why-we-design-holokit-x.md)
- [Why iPhone Only?](https://docs.holokit.io/product/concepts/why-iphone-only.md)
- [Journey of HoloKit X](https://docs.holokit.io/product/concepts/journey-of-holokit-x.md)