So this is a comparison. Grammarly wins, on everything but price.
But Linquix is pretty close, and somewhat cheaper but not a lot.
Grammarly is more mature, no doubt but at $135 a year it costs more than it needs to and Linquix Is already surpassing it in some areas.
After using Grammarly for over 6 years I switched as they are stodgy, unresponsive, treat me like dirt and are just not keeping up.