The music, the characters, the atmosphere, and even their uniform reminds me of Aria.
Same director/author. The similarities are everywhere
It's quite clear that both these anime have the same director/author because of the atmosphere, setting, character, pacing, ost and in general pretty much everything feels similar.
These two anime series are a great example of slice of life, and while Amanchu shows a more real life example, Aria sure has its own strong points in this area.
So if you liked one of this series, you can bet you'll also like the other!
Aria and Amanchu! are both works of Amano Kozue. The animation is quite similar and both are Slice of Life anime. They share the same calm and relaxing atmosphere and have a female character with a particular passion as the main protagonist. Nature (especially water) and friendship are strong themes in both Aria and Amanchu!.
Slow-paced, episodic; happy-go-lucky main heroine, cute female friendship (plus yuri bait in Amanchu), pretty ocean sceneries.
If you're not a fan of the trope where a character acts violent towards the other for comedic relief, be wared that said trope is present in Amanchu.
Both series have a relaxed, sometimes whimsically magical atmosphere, with a strong focus on personal growth, interpersonal relationships and the passing of time. Lots of water in both, and similar music.
Just by watching one episode of each show you should be able to tell that same person is author of their source material. These are some of the most relaxing shows which focus on activities relating to water.
Main difference between these shows is their subject where Aria is focused on Gondolas while Amanchu is focused on scuba diving.
Both done by the same author "Amano Kozue".Both Amanchu! and Aria are relaxing,related to water(Amanchu is about diving while Aria is about rowing gondolas), and have the same director.The characters are sure not really similar to each other but there are two girls from Teko's flashback who share the similar VA(and somewhat similar appearence) as Aria's Akari and Aika.
both series are based of a manga by the same artist, they are actually so similar The OST, The characters and the theme of the ocean is shared between the two, If you like relaxing anime give this a try.