 If you liked Koe no Katachi |  ...then you might like Komi-san wa, Comyushou desu. |
Both female leads are using a notebook to communicate or making conversations to everyone. Komi, Shouko who is afraid to speak to everyone and Nishimiya, Shouko who is deaf so she can't speak nor hear anyone. (Both have the same name "Shouko") Komi, Shouko & Ishida, Shouya who has Communication Disorder, both of them are afraid of facing everyone nor talk to them. "Komi-san wa, Comyushou desu" is comedy, wholesome, and lighthearted. while "Koe no Katachi" talks about serious issues like anxiety, depression, suicide, and bullying which has more serious tones.
report Recommended by TheMiserableWeeb
Both are similar to each other in many ways. For example, they both have two main characters, They both also include one of the main characters as someone who is a shy person who can't communicate with others. And they both have another character who is trying to help Them as well. They both use chalkboards to talk to each other and both have amazing animation. If you like Komi San wa, Comyushou desu, Then you might also love this movie. At the time of writing this, they are both on NETFLIX but they might take Koe no katachi off sometime but I hope not.
These both are similar because it is a romance and the two main characters are wholesome. Some questionable side characters, but whenever both MC's are on screen, the vibe is just so good.
report Recommended by animeloser103
There's a lot more drama in a silent voice than in Komi Can't Communicate, but otherwise, the two series have a lot of similar elements, including a shy and kind girl whose life has been transformed by the people around her. Both series have a theme of acceptance of both oneself and others.
both involve main characters named Shouko with Communication problems
report Recommended by Darkwing28