Simoun

Both animes have very deep character development, unique style and, of course, gorgeous music. 

The two are oddly similar in that they both have aspects of monkhood. They both have some yuri in them, with Simoun clearly having more. If you're into strange worlds, odd trials, and that slice of humanity that just can't be put into words, then Simoun and Haibane Renmei are for you. 

when i watched my otome it reminded me of simoun in that both rely heavily on young girls to do the fighting 

Reposting per guidelines: If you enjoyed the mood, tone, mild humor, and themes of growing from childhood to adulthood in a variety of ways, Simoun and Darling are the shows for you. Simoun is similar to Darling in many aspects, specifically that it is about couples piloting advanced devices that no one seem to clearly understand. In both series, the couples must have a harmonic relationship for piloting to be successful, which often results in difficulties as the couples try to grow up in their own individual ways. Both shows start out light and get deep quickly, with death, destruction, and lasting effects. Both shows are in a dystopian “super future” or alternate sci-if reality. read more 

Yuri anime with an emphasis on speculative sci-fi, social commentary, and serious weirdness. A surface layer of sexy character designs and suggestive scenes belies the thoughtful, introspective nature of both series. Common themes include violent conflict between societies, the political and social effects of organized religion, and a criticism of the idea that girls will have clandestine romantic feelings toward other girls but grow up to be heterosexual. Yuri Kuma is more aggressive on that last point; Simoun explores a broader range of themes. 

+ Yuri element + A special unit whose members consist of woman only + Both anime featuring mechanical unit only can be ride by MC + Conflict between three fraction (Simulacran, Argentum, and Plumbum in Simoun) (DRAGONs, Norma, & Human-mana Empire in Cross Ange) 

+ The world with no man exist + Alot yuri element in every aspect + "Religion" and "Belief" become main problem in both anime  

It's both in the yuri gerne and both series contain a bit of mecha (though, it's just minor mecha. Both series focus on the relationships of the characters more.) Both shows have beautiful music and also have a lot of drama in it. 

Simoun and Blue Drop offer a mix of shoujo-ai and giant flying ships, a combination that does not occur all that often. In both cases there is a mostly female cast and a war backdrop that fuels the plot is balanced by the interaction between the several characters. Simoun is set in a somewhat fantastical world and follows the clash between religion and military accomplishments while Blue Drop takes place in a world that is more or less realistic  

Both of them are about war, dogfights and personal problems. The main difference lies in the fact that Yukikaze is SF and Simoun is more like Steampunk, but if you'll like one of them at least a bit, you'll most likely enjoy the other one. Both series also have a wonderfull Soundtracks, fitting the events in the air and on the ground. Simoun is also known as a yuri anime, but it's not really like most of the yuri series. 

You should give Vandread a try if: > you enjoyed the gendered aspect of Simoun's worldbuilding but wished it was furthered developed, explored the other side more, and had interactions beyond fighting & "the war"; > wished for a more eventful plot than patrol missions; > wanted to see more variety in mecha/vehicle design. I rewatched the beginning episodes of Vandread for this, and I'd recommend giving the first 3-4 episodes a watch as you'll get a pretty good understanding of what to expect from the rest of Vandread's 2 seasons. If you enjoyed the first few episodes, you'll probably enjoy the rest. It's also got a decent dub imo. read more 

Similar aesthetics and atmosphere. I recon Simoun takes a lot of inspiration from these stories from the 70's. 

Both anime are about couples/pairs piloting flying machines. Both shows also incorporate magic, and have similar atmospheres. If you liked one, you'd most likely like the other! 

I think you'll find some of the themes and characters to be oddly similar. 

Both shows tell a story of young people trying to figure out why they fight in battle, with a deep underlying theme exploring the desire to stay young and innocent. On top of that, the characters learn the tenuous nature of adolescent relationships, and must find their purpose in life, for the sake of themselves and those they fight with (and against). Both series use the plot device of a mobile "ship" as a home base that confines the characters and forces them to be around one another constantly. They also use mecha/aircraft during battle to make the conflict less "personal" -- in that they never see the enemies face to face outside of very powerful plot developments.  read more 

Similarity : Partner System This system is very important in both anime. In Simoun, To protected from another country attack, Simulacrum Kingdom is defended by advanced airships known as "Simoun" which must piloted by two woman priestesses known as sibyllae. The sibyllae can inscribe enormous glyphs known as Ri Mājon in the sky using the Simoun to produce powerful magical effects both for combat and ceremony. This "Ri Majon" only can be created by two sibyllae. In Buddy Complex, Buddy System is main weapon from Free Pact Alliance to counter invasion from Zogilia Republic. This system require two pilot to perform "Connection" which giving ability FTL-like speed move.  read more 

Both anime take place largely on ships (airships in Simoun and sand ships in Children of the Whales) and involve a large cast of characters, some of whom have the ability to use some kind of super power. As the series progress, more is revealed about the characters and the world they live in 

Shoujo ai, action and fantasy are three key elements in Assault Lily: Bouquet and Simoun. Talented young girls join and work together as a team to defend their nations. The experienced main characters had traumatised due to their past that prevent them making/teaming up with a new partner and must overcome that obstacles. Yuri cannot be missed in these anime.  

Last Exile has considerably fewer lesbians, but both Exile and Simoun take place in worlds heavily reliant on science-fictional or fantastical aircraft. Also, neither really allows their airborne characters to escape reality; you won't find many idealized happy results here. 

Both series are about girls that can control flying, magical machine-like things, with the purpose of defending their base/ideals/nation. 

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. 

A lot of science fiction falls into the trap of assuming that gender roles will work the same way even on settings that are completely different from our own reality. Simoun and They Were Eleven! both reject that assumption, giving their characters an opportunity to chose their own sex at some point in their lives. Each anime ends up doing pretty different things with that idea, but if you're interested in anime with some playing with and commentary on gender in an unreal setting, you'll probably enjoy them both. 

Simoun has more lesbians and more flying things than Zero no Tsukaima, and Zero has more magic and less technology, but both take place in surprisingly complex fantasy worlds, both end up being deeper than they seem in the beginning, and both involve relationships that develop over the course of a series of trials and hardships. 

Women pilots fighting in a war. Plot revolves around complex character relationships and the drama that ensues. 

Air battles- check. Steampunk/sci fi -check. Mostly female cast -check. shoujo ai(Simoun)/ shoujo ai hints(Last exile)- check.  

in this anime theres a group of girls at war and they all have their reason for fighting. ( btw both anime have beautiful music ) 

The graphics of each series is great, and both are Yuri/Shoujo-Aï animes! If you like Yuri animes, such as: "Kannazuki no Miko" or "Maria-sama ga Miteru", than these animes are for you! The plot is great, the music is good, and as said before, the graphics are fantastic! 

Both anime feature child pilots who fly aircraft during a war in alternate universes. The Sky Crawlers is set in a world similar to ours with some differences. Simoun is set in a more fantasy-type world In The Sky Crawlers, the pilots stay as children for as long as they live, while in Simoun, the pilots can choose when they want to become adults. They both focus on drama and development, touching on philosophical and ethical issues related to the respective worlds that the characters of these two anime live in. 

Both anime have many female characters as leads; action (girls fight monster(mai-hime)/ fight wars with other countries using "heavenly" weapons (simoun)); yuri, especially simoun though mai-hime does show some signs of yuri and both have a "destiny" to follow. Overall, very similar but in different situations and plots. If you like one of them, you'll definitely like the other, no doubt! =)