Kimi ga Aruji de Shitsuji ga Ore de

Butler-mistress relationship, anime tributes, ecchi moments, and parts that will make you laugh quite much. It should be noted that KimiAru has more comedy that comes from ecchi, while Hayate is mostly based on anime tributes. Also, Hayate is more age-friendly and has a far more powerful seiyuu cast. 

One has a Brother and Sister and the other has Two Sisters, but they're both running away from their parents. At first the viewer is not shown why they left. But they both end up being maids/butlers for pompous rich folk. ...Hilarity ensues. 

main character becomes the butler of three female masters and he and his sister work with 2 other maids and butlers. The mistresses all tease him about his innocence with seductive advances. Likewise, in both shows: the main characters are trained to be ideal butlers, are full of ecchiness and fan service, and they are both clear cut harems. 

Really similar characters (we even have two Kuki Agehas, who looks almost the same). Also, main characters in each series resembles to others.  

Crazy comedies with tons of parodies and a small romance story that isn't really focused on. Moreover, the most parodied shows in both anime are Gundam and Kamen Rider.  

it was a good relief for me to watch one after the other.. since they both deal with maids protecting their masters, with action and a lot of ecchines comedy.. 

Over the top butlers and references galore. Both are similar in many aspects and enjpy parodying other animes/etc. 

Besides the element of magic in Princess, it is rather similar to this show in terms of drawing, humor and minor plot... As in, running away and becoming a butler, the attractive maid... the divided affections... JUST WATCH IT IF YOU LIKED THIS SHOW. 

Both series features a protagonist who gets involved with other characters in the series of conflicting personalities. Two of the main female protagonist in the both series have similar personalities in that they are dominant and in control of most situations as well as being quite mischievous. Both series have fan-service mixed in with comedy, drama, and a little romance later on. 

Royalty plays a theme in both of these harem series as the MC befriends many girls with conflicting personalities. Drama, romance, and misunderstandings picks up as the episodes goes on.  

Both animes are ecchi/harem type. The MC is surrounded by very good looking female characters. The art style is very similar in both animes. Both have their share of comedy and a lot of ecchi moments (and nudity). 

Both involve a character (or two) in an unfortunate situation getting an opportunity to live and work in a mansion as cleaning/support staff. In both cases the residents of the mansion are unusual and quirky characters. While there are plenty of differences between the two, there were moments where they have a similar feel to one another. 

Both are good example of series that cant really decide if they want to go with the funny comedy style or the all series drama theme, which ends up ruining both series quite a lot. Both series have romance, kimi ga aruji doesnt have all that much though. Both series have an overall plot which isnt really focused on rather they both go with a bunch of short arcs. 

Both series features themes of the maid/butler theme mixed in with comedy, romance, and drama. Although the main protagonists are somewhat different in terms of personalities, the colorful cast presents an entertaining mood that depicts the life of a luxury. Both series also has gags and some fan-service. 

The servant is an gorgeous alien girl and the master is a very lucky, but hardheaded guy. Similar in the fact that relations grow between servant and master. 

A harem anime seen through a fun-house mirror. Both anime feature a strong and cool male lead voiced by Seki Tomokazu. With absurd humor, random violence, and subtle (or not-so-subtle) parodies. 

Both male protagonists share many similarities. They are surrounded by great looking, attractive females in a house where they don't have much say (one is a butler while the other is the youngest, not to mention adopted, of 6 siblings). Both anime originated from H-games (visual novel). Both have extremely similar storyline. Why do I keep saying both? Both female leads (I am referring to Kaname and Shinra) are GORGEOUS and look VERY VERY similar! 

While Clannad is a bit lighthearted and Kimi ga Aruji is quite ecchi, both series actually revolves around the importance of a family which will be more apparent in the later episodes of Kimi ga Aruji. Also, in both series, both male protagonist hates their father and both tries to reconcile with them. 

In both there´s ecchi, where a guy lives in a house surrounded by girls. In both, the owners of the house are three sisters. There´s also a lot of similar comedy, and in both animes, the main guy shares a special relationship with the older sister. In both animes is shown the importance of friendship and family.  

While KimiAru focuses on butlers and maids and BakaTest is a high school setting, I found both to have similar humor. If you found one funny, you're likely to enjoy the other. Both series have a similar length (~13 eps) with quickly developing paces. Both series also focus on social standing (the master-servant relationship in KimiAru and improving one's service skills, while the constant struggle of the idiots in Class F to be treated seriously by those in higher academic levels). Sometimes, there are parodies (BakaTest has a very funny Evangelion episode, KimiAru pokes fun at Death Note), sometimes the humor is character trait-based... But both are enjoyable comedies. read more 

Similarities: Both have the same harem , comedy and romance kind of thing. Both involves a butler and mistress relationship. Both butlers have been ordered to do such outrageous things by their mistress. Dissimilarities: One was mostly on the dramatic side while the other is more on comedy. The mistress in one anime was a grown woman, while in the other anime is was an immature teen. One was more of a pseudo harem, while the other is a true harem.