K-On!, Toaru Kagaku no Railgun Recommendations
A story about friendship of four school girls. Both offers comedy and Aki Toyosaki does voice actor in both anime.
They both show ''cute girls doing cute things''. The only difference is that Railgun has a plot, kinda.
If you're looking for a similar type of bond between four girls. Both shows are funny and revolve around four friends, and some of them even look similar. K-on is more focused on music whereas railgun is more concentrated on super powers. Both are recommended! :)
Both shows feature 4 cute girls doing cute things. These shows are episodic, or at least have distinctive, non-connected arcs. They are slice of life series for moe lovers.
Although I liked Railgun much better than K-On, the group dynamic has some similarities.
They both follow the "Cute girls doing Cute things" undertone than lots of Moe anime have.
K-On, as you probably know, is about music whereas Railgun is about a badass chick that shoots lightning from her mind.
They both have a fair bit of humor too if you like that, I personally liked Railgun's humor more but one or the other might work better for someone else.