I’ve had my eye on this for a while, I’m a rigorous notebook and pen note taker but the ability to search through notes would be a huge benefit - do you find the integration with other services to work well? (I would want to export notes to a separate cloud storage platform like OneDrive)

There is not one definition, if you hear “4K” you can use the context of the conversation to determine if they’re talking about the consumer 4K UHD format or cinematic 4K, neither of which have a vertical resolution of exactly 4000px. UHD standards are maintained by ITU DCI standards were developed by the DCI group and are now maintained by SMPTE

4K UHD (along with 8K UHD and 16K UHD) are the consumer format standards for 3840x2160 image formats which includes Blu-ray. Full 4K or True 4K or DCI 4K is the cinematic 4K standard shown at 4096x2160, which many TVs supper via slight letterboxing

4K is definitely a formal standard