We had a need to provide basic API Design capabilities in an ultra-slim package, without all of the extra features found in Apicurio Studio - and thus Apicurito was born!
Apicurito is basically the OpenAPI editor found in Studio and repackaged as a simple standalone web application. It has no back-end component at all, which makes it incredibly easy to package, deploy, and use. However, the trade-off is that it only supports the core visual editing experience found in Studio, without the collaboration, persistence, and integration with external systems.
Use Apicurito if all you want/need to do is load an OpenAPI file from your local file system and visually edit it (and then save it back to your disk)!