Kumo desu ga, Nani ka?
So I'm a Spider, So What?

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Both have a human reincarnated as a weak monster that becomes op over time, explanations for both are within reason, both are fun reads! 

Similar premise. Both get send into a game like world as low level monsters that grow. But Slime has a far more serious tone and overall plays a little bit faster. 

Both characters are reincarnated into a fantasy world as monsters. They both have OP and unique skills.  

Both characters are reincarnated into a fantasy world as monsters. They have unique skills that enable them to gain strength quickly. The protagonists are different than the traditional isekai protagonists with one having no gender and the other being female. 

-Both are isekais with good execution -MCs start off weak but becomes OP -Similar and likeable MCs  

Warning: Both series CAN and WILL send you down the Light Novel-Based Isekai Manga genre. TenSura and Kumo Desu are distinguished from other series as both have a great sense of progression. TenSura is more about growth of scale, as the MC gains more followers and grows his estate. Kumo Desu on the other hand is about the growth of character, as the MC obtains more skills and fights stronger enemies. While similar in a lot of ways, both are different enough to warrant a recommendation if you enjoyed the other. 

Both characters are reincarnated into a fantasy world as monsters. They both have OP and unique skills.  

Both protagonists were human who were reincarnated as monsters in another world with their human memories intact. 

Both Isekai with consumed creatures giving abilities to MC 

Both protagonists reincarnated as monster in another world (fantasy world) as monsters, and have to survive on these worlds. 

Same type or reincarnation princible. Both end up as Monsters that gain skills and levels rapidly and quickly become very powerful. Tho big differences is that where as Re:Monster it feels very unearned most of the time. In this manga the MC actually feels like she has to struggle for every fight despite all the skills she gains. 

Both MC's are reincarnated as weak creatures in a video game-like world and gradually evolve through leveling up acquiring new skills and abilities. 

The protagonists are reincarnated into a fantasy world as a monster. Each story focuses heavily on the characters leveling up, and the respective powers that the characters gain in different evolutionary stages. Both characters are able to choose which evolutionary path they will take. 

Both becomes a monster. Both uses evolution and skill system. 

Both main characters became isekaid, one in a fantasy world and the other in the world of a game. Both of the main characters are female and it's about spiders. The difference is that Joou Heika no Isekai Strategy (Her Majesty's Swarm) is much more brutal and bloody.