Uchuu no Stellvia

In both series, we follow a girl excited to be beginning life in space aboard a space station, as she develop her space skills from novice levels, helps the people of Earth and space, and finds drama and romance. 

Both animes are set in space with a Sci-fi motif. The characters go through emotional arcs and work through self discovery. If you liked one you will like the other. 

Both are space related with a few romances here and there. Mechs are another similarity and there is a vast exploration of planets and locations out there. Difference is one is a series and the other is a H-series, 'Vandread' actually focus on romantic scenes more often than you think and battles second. 'Uchuu no Stellvia' is a hardcore action H-series that has a bit of everything from tentacles to animals. Fighting is not the main focal point here so anyone who wants to dream of hot ladies will not be disappointed in these two series. 

An ordinary student gets the chance of a lifetime as she embarks on a space adventure. Both series are helmed by the same director and employ similar graphics for its spaceship models. 

Regular schoolgirls in semi-utopian space colonies - very similar feel. 

Both anime are produced by the same studio with stories that explore the challenges humanity faces when it realizes how dangerous space can be despite the ambitions. 

Neither Stellvia nor Classroom☆Crisis begins its story with a clear view of the main conflict of the plot, yet both series use strong character development to slowly build a compelling drama. The futuristic classroom setting of both series also allows for a fair amount of slice-of-life episodes, allowing for a controlled pacing of the story rather than plunging straight into overly dramatic scenarios. 

both anime is set in futuristic time, have a school that make them develop their skills, both is aiming to go the galaxy and make their dreams come true...  

Similarities : The shows are identical, despite the fantasy x sci-fi difference - underdog main girl protagonist that improves as the plot goes on - dreams, friendship and self development as main themes - fantasy high school setting that is separate from "our world" - variety of characters making the main cast of characters - chill and comfy feel yet the show touches serious issues Differences: - Stellvia is set in sci-fi/space - Stellvia has drama elements unlike LWA - Stellvia has more and better developed cast of male characters - Stellvia has romance - Stellvia has better pacing and world development - Stellvia has outdated yet beautiful animation of technology and mechas - Stellvia gets more serious in the second half of season while LWA stays lighthearted read more 

Main character wants to go to space Mecha, main character use a super mecha a some one who couldnt believe in themselves become a great hero first half is against one enemy, the second half "aliens" The story line is VERY simliar 

An anime with the same genre. This one is about students from a space academy. 

They are both about cute young girls who have to go away to help save people. In both the young girls grow as people throughout the series... Yet still maintain the characteristics that make them so cute and lovable.  

In both ther are mecha, schoolgirls as main heroes, male characters who are weak in iunderstanding women, and systems of connecting human mind to computer. Stellvia is more shoujo though 

they are both mecha and follow the same lead, the lead characters both have trouble and are trying to figure out where they belong 

Both have a girl who left Earth to space trying to make her dream come true, along the way she meets alot of freinds and learn new things in life. they both feel like they are taken from real life Exp. 

Both series are about girls who pilot various vehicles that use some sort of modification to fly (Gravity mod in Stellvia, Time/Space mod in Simoun). Both have heavy use of integrated CGI. Both have similar music. Both have a romance subplot. 

Similar in using robot to protect the world (whole story) 

In both anime there is a klutz good for nothing girl who wants to go to space, and they both work hard to get over their weekness and be as good as the person they admire. 

Tokyo Space School and Stellvia foundation share an identical goal: to forge a generation who could find herself a way to the stars and open a new era for the humankind. Taking journey looking for different answers, characters fortify friendship on their respective path to adulthood beyond competition and individualism. 

Both shows involve students attending an academy in space. The students are training to protect humanity while working hard to reach their goals.  

just reading the plot stratos seem verry similer to stellvia since there are boys and girls tring to protect a major distater for destroying the earth and a girls is the main character. alhough stellvia is based is space and only one or two episodes are on earth stratos 4 seems to be bases majorly on earth by the way i am just about to start watching stratos 4 and this recomadation is based on the plot that i have read which has instantly reminded me of stellvia.  

Stellvia represents another solar system wide destructive event, and another group of girls and boys are asked to defend their lives in a never declared war against unknown enemies. Both are set on a peaceful Space Academy, quickly transformed forcedly into a military outpost. Other similarities follows: an hidden and powerful secret weapon driven by students, background political intrigues, and the continuous fluctuation from individual competition to group cooperation strengthened by critical times. 

both of them have people entering into space controlling spacecraft trying to save the universe.