While both fall under the category of omelette, the two are fairly distinctive when compared side-by-side. According to Allrecipes, the omelette only requires eggs and butter (because what is a French dish without the addition of butter). For the tamagoyaki, you will need a few more ingredients like sugar, salt, vinegar, soy sauce, and miso, per Bon Appétit. The publication also cites that things like sake, mirin, dashi, and/or dashi powder can be added to the mix as well.
As a Tasty cooking video shows, the finished product for both omelettes are visually very different. Where the omelette is creamy and circular, the tamagoyaki is fluffy and a bit more rectangular. Why does the tamagoyaki look more rectangular? That’s due to the pan that it is cooked in, Bon Appétit explains. Tamagoyaki is typically made in a rectangular tamagoyaki pan that helps facilitate all the flipping action that occurs. Regardless of which you are looking to indulge on, one thing holds certain for both of these eggy delights — they we will be utterly delicious.