 If you liked
Isekai wa Smartphone to Tomo ni.
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 ...then you might like
Ore dake Haireru Kakushi Dungeon
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If you enjoy Ore dake Haireru Kakushi Dungeon a.k.a The Hidden Dungeon Only I Can Enter. You will definitely enjoy Isekai wa Smartphone to Tomo ni.
In both of these anime the main character has OP powers and skills. They both can create skills and have OP magic. And of course both characters have a harem fighting over them. They both serve for the greater good in their world which grant them respect from other characters. Its pretty nice to watch if there's nothing else on the list to watch.
If you like OP main characters, action and adventure, and Harems. Isekai wa Smartphone to Tomo
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Recommended by Flyingsparks1130
The dungeon only I can enter isn't an isekai but the MC is pretty powerful (like the protag in Isekai wa Smartphone to Tomo ni.?).
Another similarity is that both MCs have a harem of girls.
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Recommended by Anime_Guy_2